Categories: Fourth Year First Semester (4-1)

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

5 a) Explain the effects on differential settlements of the foundations. [6M]

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

5 a) Explain the effects on differential settlements of the foundations. [6M]

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

R13

SET – 2

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

5 a) Explain the effects on differential settlements of the foundations. [6M]

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

R13

SET – 2

Code No: RT32012

6 a) Write short note on Efficiency of Pile Groups [6M]

b) A group of 9 piles with 3 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and length of piles were 30 cm and

10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If

the piles were placed 90 cm center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

[10M]

7 a) Draw component parts of Well foundation and list out their functions. [8M]

b) Explain the significance of grip length in Well foundations. [8M]

*****

2 of 2

R13

SET – 2

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

R13

SET – 2

Code No: RT32012

6 a) Write short note on Efficiency of Pile Groups [6M]

b) A group of 9 piles with 3 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and length of piles were 30 cm and

10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If

the piles were placed 90 cm center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

[10M]

7 a) Draw component parts of Well foundation and list out their functions. [8M]

b) Explain the significance of grip length in Well foundations. [8M]

*****

2 of 2

R13

SET – 2

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the fallowing terms used in soil exploration. (i) Area ratio (ii) Recovery ratio

[4M]

b) What are the basic assumptions in Rankine?s theory [4M]

c) What are the factors affecting the bearing capacity of the foundation? [4M]

d) What is the secondary settlement? Why it is developed? [3M]

e) Explain the basic difference between the bearing capacity of shallow foundation

and deep foundation?

[3M]

f) What is floating Caisson? How its stability can be checked? [4M]

PART -B

2 a) What are the objectives of the exploration program? [8M]

b) Explain and discuss the various factors that help to decide the number and depth of

bore holes required for subsoil exploration.

[8M]

3 a) Compute the factor of safety of an infinite slope in a cohesionless soil for a steady

state seepage condition, when the flow is parallel to the slope.

[8M]

b) Find the critical height of an infinite slope having a slope angle of 30?. The slope is

made of stiff clay having a cohesion 20 kN/m

2

, angle of internal friction 20?, void

ratio 0.7 and specific gravity 2.7. Consider the following cases for the analysis. (i) the

soil is dry. (ii) the water seeps parallel to the surface of the slope. (iii) the slope is

submerged.

[8M]

4

A square footing 1.8mx1.8m is placed over loose sand of bulk density 16kN/m

3

,

saturated density 18kN/m

3

and at a depth of 1.0m. The angle of shearing resistance

is 30

0

. Determine the ultimate bearing capacity when there is no effect of water

table and when it is submerged (for f= 30

0

, the Nc=30.14, Nq=18.4and N?=15.1).

[16M]

5 a) Differentiate between total settlement and differential settlement. What are the

problems associated with the differential settlements on structures? What are the

possible remedial measures?

[8M]

b) A foundation 6 m X 3 m, carrying a uniform pressure of 200 kN/m

2

, is located at a

depth of 1.5 m in a layer of clay 4 m thick for which the value of E

u

is 35 MN/m

2

. The

layer is underlain by a second clay layer 12 m thick for which the value of E

u

is 80

MN/m

2

. A hard stratum lies below the second layer. Determine the average

immediate settlement under the foundation

For H/B = 2 and L/B ? ?

1

= 0.60

H/B = 6 and L/B ? ?

2

= 0.85

For D/B = 0.5 and L/B = 2 ? ?

0

= 0.94.

1 of 2

[8M]

R13

SET – 3

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

R13

SET – 2

Code No: RT32012

6 a) Write short note on Efficiency of Pile Groups [6M]

b) A group of 9 piles with 3 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and length of piles were 30 cm and

10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If

the piles were placed 90 cm center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

[10M]

7 a) Draw component parts of Well foundation and list out their functions. [8M]

b) Explain the significance of grip length in Well foundations. [8M]

*****

2 of 2

R13

SET – 2

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the fallowing terms used in soil exploration. (i) Area ratio (ii) Recovery ratio

[4M]

b) What are the basic assumptions in Rankine?s theory [4M]

c) What are the factors affecting the bearing capacity of the foundation? [4M]

d) What is the secondary settlement? Why it is developed? [3M]

e) Explain the basic difference between the bearing capacity of shallow foundation

and deep foundation?

[3M]

f) What is floating Caisson? How its stability can be checked? [4M]

PART -B

2 a) What are the objectives of the exploration program? [8M]

b) Explain and discuss the various factors that help to decide the number and depth of

bore holes required for subsoil exploration.

[8M]

3 a) Compute the factor of safety of an infinite slope in a cohesionless soil for a steady

state seepage condition, when the flow is parallel to the slope.

[8M]

b) Find the critical height of an infinite slope having a slope angle of 30?. The slope is

made of stiff clay having a cohesion 20 kN/m

2

, angle of internal friction 20?, void

ratio 0.7 and specific gravity 2.7. Consider the following cases for the analysis. (i) the

soil is dry. (ii) the water seeps parallel to the surface of the slope. (iii) the slope is

submerged.

[8M]

4

A square footing 1.8mx1.8m is placed over loose sand of bulk density 16kN/m

3

,

saturated density 18kN/m

3

and at a depth of 1.0m. The angle of shearing resistance

is 30

0

. Determine the ultimate bearing capacity when there is no effect of water

table and when it is submerged (for f= 30

0

, the Nc=30.14, Nq=18.4and N?=15.1).

[16M]

5 a) Differentiate between total settlement and differential settlement. What are the

problems associated with the differential settlements on structures? What are the

possible remedial measures?

[8M]

b) A foundation 6 m X 3 m, carrying a uniform pressure of 200 kN/m

2

, is located at a

depth of 1.5 m in a layer of clay 4 m thick for which the value of E

u

is 35 MN/m

2

. The

layer is underlain by a second clay layer 12 m thick for which the value of E

u

is 80

MN/m

2

. A hard stratum lies below the second layer. Determine the average

immediate settlement under the foundation

For H/B = 2 and L/B ? ?

1

= 0.60

H/B = 6 and L/B ? ?

2

= 0.85

For D/B = 0.5 and L/B = 2 ? ?

0

= 0.94.

1 of 2

[8M]

R13

SET – 3

Code No: RT32012

6 a) Discuss how pile load test can be conducted and the results are interpreted in

design.

[8M]

b) A 30 cm dia. Pile penetrates a deposit of soft clay 9m deep and rests on sand.

Compute the skin friction resistance. The clay has a unit cohesion of 0.6 kg/cm

2

.

Assume an adhesion factor of 0.6 for the clay.

[8M]

7 a) What are ?Tilts and Shifts?? Explain the remedial measures to control these? [8M]

b) Sketch a completed well foundation for a Bridge pier. Indicate the various

components and their functions.

[8M]

*****

2 of 2

R13

SET – 3

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

R13

SET – 2

Code No: RT32012

b) A group of 9 piles with 3 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and length of piles were 30 cm and

10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If

the piles were placed 90 cm center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

[10M]

7 a) Draw component parts of Well foundation and list out their functions. [8M]

b) Explain the significance of grip length in Well foundations. [8M]

*****

2 of 2

R13

SET – 2

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the fallowing terms used in soil exploration. (i) Area ratio (ii) Recovery ratio

[4M]

b) What are the basic assumptions in Rankine?s theory [4M]

c) What are the factors affecting the bearing capacity of the foundation? [4M]

d) What is the secondary settlement? Why it is developed? [3M]

e) Explain the basic difference between the bearing capacity of shallow foundation

and deep foundation?

[3M]

f) What is floating Caisson? How its stability can be checked? [4M]

PART -B

2 a) What are the objectives of the exploration program? [8M]

b) Explain and discuss the various factors that help to decide the number and depth of

bore holes required for subsoil exploration.

[8M]

3 a) Compute the factor of safety of an infinite slope in a cohesionless soil for a steady

state seepage condition, when the flow is parallel to the slope.

[8M]

b) Find the critical height of an infinite slope having a slope angle of 30?. The slope is

made of stiff clay having a cohesion 20 kN/m

2

, angle of internal friction 20?, void

ratio 0.7 and specific gravity 2.7. Consider the following cases for the analysis. (i) the

soil is dry. (ii) the water seeps parallel to the surface of the slope. (iii) the slope is

submerged.

[8M]

4

A square footing 1.8mx1.8m is placed over loose sand of bulk density 16kN/m

3

,

saturated density 18kN/m

3

and at a depth of 1.0m. The angle of shearing resistance

is 30

0

. Determine the ultimate bearing capacity when there is no effect of water

table and when it is submerged (for f= 30

0

, the Nc=30.14, Nq=18.4and N?=15.1).

[16M]

5 a) Differentiate between total settlement and differential settlement. What are the

problems associated with the differential settlements on structures? What are the

possible remedial measures?

[8M]

b) A foundation 6 m X 3 m, carrying a uniform pressure of 200 kN/m

2

, is located at a

depth of 1.5 m in a layer of clay 4 m thick for which the value of E

u

is 35 MN/m

2

. The

layer is underlain by a second clay layer 12 m thick for which the value of E

u

is 80

MN/m

2

. A hard stratum lies below the second layer. Determine the average

immediate settlement under the foundation

For H/B = 2 and L/B ? ?

1

= 0.60

H/B = 6 and L/B ? ?

2

= 0.85

For D/B = 0.5 and L/B = 2 ? ?

0

= 0.94.

1 of 2

[8M]

R13

SET – 3

Code No: RT32012

6 a) Discuss how pile load test can be conducted and the results are interpreted in

design.

[8M]

b) A 30 cm dia. Pile penetrates a deposit of soft clay 9m deep and rests on sand.

Compute the skin friction resistance. The clay has a unit cohesion of 0.6 kg/cm

2

.

Assume an adhesion factor of 0.6 for the clay.

[8M]

7 a) What are ?Tilts and Shifts?? Explain the remedial measures to control these? [8M]

b) Sketch a completed well foundation for a Bridge pier. Indicate the various

components and their functions.

[8M]

*****

2 of 2

R13

SET – 3

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the following terms used in soil exploration. (i) Representative sample (ii) Undisturbed sample

[4M]

b) What are the basic assumptions in Coulomb?s theory. [3M]

c) What are the assumptions made in the Terzaghi bearing capacity theory? [4M]

d) In fully saturated clay, with undrained condition, what will be the immediate

settlement of the foundation, if it is constructed on it.

[4M]

e) What is main difference between the friction piles and end bearing piles? [3M]

f) Draw the component parts of well foundation and explain its functions. [4M]

PART ?B

2 a) Describe the procedure of conducting a Pressure meter test. [8M]

b) Describe open excavation methods of exploration. What are their advantages and

disadvantages?

[8M]

3 A vertical wall 9 m high retains soil level with the top of the wall retains sand for which

f = 30

o

, c? = 0, ?

dry

= 18 kN/m

3

, ?

sat

= 20 kN/m

3

. Use Rankine’s method to obtain the

magnitude and line of action of the active earth force on the wall, if the water table

lies:

(i) at the upper soil surface

(ii) below the bottom of the wall

(iii) half-way up the wall

In each case sketch the pressure distribution on the wall.

[16M]

4 a) What are the points to be kept in consideration for locating of depth of footing? [6M]

b) A continuous footing of width 2.5m rests 1.5m below the ground surface in clay. The

unconfined compressive strength of the clay is 150kN/m

2

. Calculate the ultimate

bearing capacity of the footing. When there is no effect of water table and when

water table reaches ground surface. Take ?=18kN/m

3

, ?

sat

=20kN/m

3

.

[10M]

5 a) Differentiate between Safe bearing Capacity and Allowable bearing capacity. [7M]

b) A footing, 2m square, is founded at a depth of 1.5m in a sand deposit, for which the

observed SPT value (N) is 35.Water table is at a depth of 1.5m from the surface.

Determine the net allowable bearing pressure, if the permissible settlement is

40mm and factor of safety of 3 is desired against shear failure.

1 of 2

[9M]

R13

SET – 4

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) What is a soil profile? What is its influence on the exploratory programme? [4M]

b) What is the Taylor?s Stability Number? What is the importance of this number? [4M]

c) Write a brief note on types of failures in shallow foundations. [3M]

d) How does the construction period effect the settlement of the foundation? [3M]

e) Write brief note on the Engineering New?s Formula. [4M]

f) What is caisson disease? What are the precautions necessary to prevent it? [4M]

PART -B

2 a) How soil samples are classified based on the amount of disturbance in sampling? [4M]

b) Write briefly about the Standard penetration test conducted in the field. What are

the corrections to be made to the standard penetration value?

[12M]

3 A vertical gravity retaining wall, 12 m high, is to retain a clayey soil for which

c

u

= 25 kN/m

2

, fu = 15

o

and the bulk unit weight ?b = 19 kN/m

3

. The soil surface is

horizontal and level with the top of the wall. The water table is horizontal and level

with the bottom of the wall. Determine the magnitude and direction of the

minimum force on the wall for a trial wedge whose slip surface rises from the

bottom of the wall at 70

o

to the horizontal. Assume that the angle of wall friction is

10

o

and the wall adhesion is 15 kN/m

2

.

[16M]

4 A strip footing (Fig. 1) of width 2 m is founded at a depth of 2 m below the ground

surface in a (c – f) soil having a cohesion c = 30 kN/m

2

and angle of shearing

resistance, f = 35?. The water table is at a depth of 8 m below ground level. The

moist weight of soil above the water table is 17.25 kN/m

3

. Determine (i) the

ultimate bearing capacity of the soil, (ii) the net bearing capacity, and (iii) the net

safe bearing pressure and the load/m for a factor of safety of 3. Use the general

shear failure theory of Terzaghi. For f = 35?, N

c

= 57.8, N

q

=41.4, and N? = 42.4.

Fig. 1

1 of 2

[16M]

R13

SET – 1

Code No: RT32012

b) A square footing of size 4 x 4 m is founded at a depth of 2 m below the ground

surface in loose to medium dense sand. The corrected standard penetration test

value N

cor

=11. Compute the safe bearing pressure, q

s

by using Teng?s equation for

the settlement of 25 mm.

[10M]

6 a) What are the advantages and disadvantages of Driven piles? [6M]

b) A concrete pile of 45 cm diameter was driven into sand of loose to medium density

to a depth of 15m. The following properties are known: Average unit weight of soil

along the length of the pile, y = 17.5 kN/m

3

, average f = 30?, average K

s

= 1.0 and

d= 0.750.

Calculate (i) the ultimate bearing capacity of the pile, and (ii) the allowable load

with Fs = 2.5. Assume the water table is at great depth. For L/d ratio of 33.3 and

f = 30?, the N

q

value is 16.5.

[10M]

7 a) Write short note on Sinking of Wells. [8M]

b) What are ?Tilts and Shifts?? What are the remedial measures to control these? [8M]

*****

2 of 2

R13

SET – 1

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Write down the design considerations of open drive sampler. [4M]

b) What are the basic assumptions made in the stability analysis of slopes [4M]

c) Write short note on General shear failure. [3M]

d) Why the elastic settlement is not much important compared to the consolidation

settlement in settlement of foundations

[3M]

e) What is the basis on which Dynamic pile formula is derived? [4M]

f) What are the forces acting on the Well foundation? Explain in detail. [4M]

PART -B

2 a) Describe the procedure for conducting a Pressure meter Test. [8M]

b) Write short Note on Depth of Exploration and How can you fix the Depth of

Boring in different case of Foundations? i.e Shallow and Deep Foundations.

[8M]

3 Find the factor of safety of a slope of infinite extent having a slope angle = 25?.

The slope is made of cohesive soil. The soil made of clay having c’ – 30 kN/m

2

,

f’ = 20?, e = 0.65 and G

s

= 2.7 and under the following conditions: (i) when the

soil is dry, (ii) when water seeps parallel to the surface of the slope, and (iii) when

the slope is submerged.

[16M]

4 A foundation 1.5 m square is installed 1.5 m below the surface of uniform sandy

gravel having a density of 18.9 kN/m

3

above the water table and a submerged

density of 9.8 kN/m

3

. The effective strength parameters are c

1

= 0 kN/m

2

and

?

1

= 36

0

. Find the gross ultimate bearing capacity for the conditions of water

table well below the base (with rupture zone above the water table) Water table

rising to the level of the base of the foundation and the water table raises to the

ground level. Use IS ? Code theory. The bearing capacity factors are, ? = 35

0

,

Nq

=

33.30 and N

r

= 48.30. Shape factors: S

q

= 1.2; S

r

= 0.8 and

d

q

=d

r

= 1 + 0.1

B

D

k

p

, where k

p

= tan

2(45+ ?/2).

[16M]

5 The following observations relate to a plate load test conducted on a 30cm

square test plate placed at a depth of 1.5m in a soil deposit.

Intensity of load(kg/cm

2

)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Settlement (mm) 0 2 4 7 11 16 23 32 45

Plot the load-settlement curve and determine the allowable bearing

pressure for a 2m square footing for a minimum factor safety 2.5 with respect to

shear failure and a maximum permissible settlement 25mm. water table is at a

depth of 2m below ground surface. What will be the actual factor of safety with

respect to shear failure and maximum permissible settlement?

1 of 2

[16M]

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Code No: RT32012

b) A group of 9 piles with 3 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and length of piles were 30 cm and

10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If

the piles were placed 90 cm center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

[10M]

7 a) Draw component parts of Well foundation and list out their functions. [8M]

b) Explain the significance of grip length in Well foundations. [8M]

*****

2 of 2

R13

SET – 2

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the fallowing terms used in soil exploration. (i) Area ratio (ii) Recovery ratio

[4M]

b) What are the basic assumptions in Rankine?s theory [4M]

c) What are the factors affecting the bearing capacity of the foundation? [4M]

d) What is the secondary settlement? Why it is developed? [3M]

e) Explain the basic difference between the bearing capacity of shallow foundation

and deep foundation?

[3M]

f) What is floating Caisson? How its stability can be checked? [4M]

PART -B

2 a) What are the objectives of the exploration program? [8M]

b) Explain and discuss the various factors that help to decide the number and depth of

bore holes required for subsoil exploration.

[8M]

3 a) Compute the factor of safety of an infinite slope in a cohesionless soil for a steady

state seepage condition, when the flow is parallel to the slope.

[8M]

b) Find the critical height of an infinite slope having a slope angle of 30?. The slope is

made of stiff clay having a cohesion 20 kN/m

2

, angle of internal friction 20?, void

ratio 0.7 and specific gravity 2.7. Consider the following cases for the analysis. (i) the

soil is dry. (ii) the water seeps parallel to the surface of the slope. (iii) the slope is

submerged.

[8M]

4

A square footing 1.8mx1.8m is placed over loose sand of bulk density 16kN/m

3

,

saturated density 18kN/m

3

and at a depth of 1.0m. The angle of shearing resistance

is 30

0

. Determine the ultimate bearing capacity when there is no effect of water

table and when it is submerged (for f= 30

0

, the Nc=30.14, Nq=18.4and N?=15.1).

[16M]

5 a) Differentiate between total settlement and differential settlement. What are the

problems associated with the differential settlements on structures? What are the

possible remedial measures?

[8M]

b) A foundation 6 m X 3 m, carrying a uniform pressure of 200 kN/m

2

, is located at a

depth of 1.5 m in a layer of clay 4 m thick for which the value of E

u

is 35 MN/m

2

. The

layer is underlain by a second clay layer 12 m thick for which the value of E

u

is 80

MN/m

2

. A hard stratum lies below the second layer. Determine the average

immediate settlement under the foundation

For H/B = 2 and L/B ? ?

1

= 0.60

H/B = 6 and L/B ? ?

2

= 0.85

For D/B = 0.5 and L/B = 2 ? ?

0

= 0.94.

1 of 2

[8M]

R13

SET – 3

Code No: RT32012

6 a) Discuss how pile load test can be conducted and the results are interpreted in

design.

[8M]

b) A 30 cm dia. Pile penetrates a deposit of soft clay 9m deep and rests on sand.

Compute the skin friction resistance. The clay has a unit cohesion of 0.6 kg/cm

2

.

Assume an adhesion factor of 0.6 for the clay.

[8M]

7 a) What are ?Tilts and Shifts?? Explain the remedial measures to control these? [8M]

b) Sketch a completed well foundation for a Bridge pier. Indicate the various

components and their functions.

[8M]

*****

2 of 2

R13

SET – 3

Code No: RT32012

III B. Tech II Semester Regular/Supplementary Examinations, April – 2018

GEOTECHNICAL ENGINEERING ? II

(Civil Engineering)Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

*****

PART ?A

1 a) Explain the following terms used in soil exploration. (i) Representative sample (ii) Undisturbed sample

[4M]

b) What are the basic assumptions in Coulomb?s theory. [3M]

c) What are the assumptions made in the Terzaghi bearing capacity theory? [4M]

d) In fully saturated clay, with undrained condition, what will be the immediate

settlement of the foundation, if it is constructed on it.

[4M]

e) What is main difference between the friction piles and end bearing piles? [3M]

f) Draw the component parts of well foundation and explain its functions. [4M]

PART ?B

2 a) Describe the procedure of conducting a Pressure meter test. [8M]

b) Describe open excavation methods of exploration. What are their advantages and

disadvantages?

[8M]

3 A vertical wall 9 m high retains soil level with the top of the wall retains sand for which

f = 30

o

, c? = 0, ?

dry

= 18 kN/m

3

, ?

sat

= 20 kN/m

3

. Use Rankine’s method to obtain the

magnitude and line of action of the active earth force on the wall, if the water table

lies:

(i) at the upper soil surface

(ii) below the bottom of the wall

(iii) half-way up the wall

In each case sketch the pressure distribution on the wall.

[16M]

4 a) What are the points to be kept in consideration for locating of depth of footing? [6M]

b) A continuous footing of width 2.5m rests 1.5m below the ground surface in clay. The

unconfined compressive strength of the clay is 150kN/m

2

. Calculate the ultimate

bearing capacity of the footing. When there is no effect of water table and when

water table reaches ground surface. Take ?=18kN/m

3

, ?

sat

=20kN/m

3

.

[10M]

5 a) Differentiate between Safe bearing Capacity and Allowable bearing capacity. [7M]

b) A footing, 2m square, is founded at a depth of 1.5m in a sand deposit, for which the

observed SPT value (N) is 35.Water table is at a depth of 1.5m from the surface.

Determine the net allowable bearing pressure, if the permissible settlement is

40mm and factor of safety of 3 is desired against shear failure.

1 of 2

[9M]

R13

SET – 4

Code No: RT32012

6 a) What are the factors that governs, during selection of Piles? [6M]

b) A group of 16 piles with 4 piles in a row was driven into a soft clay extending from

ground level to a great depth. The diameter and the length of the piles were 40 cm

and 10m respectively. The unconfined compressive strength of the clay is 85 kPa. If

the piles were placed 1.20 m center to center, compute the allowable load on the

pile group on the basis of a shear failure criterion for a factor of safety of 2.5.

Neglect bearing resistance of Piles.

[10M]

7 a) Sketch a completed well foundation for a Bridge pier. Indicate the various

components and their functions.

[8M]

b) How do you analyze the well for its lateral stability? [8M]

*****

2 of 2

R13

SET – 4

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