GTU BE 7th Semester 172205 Rock Slope Engineering Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE ? 7 SEMESTER? ? EXAMINATION ? SUMMER 2018
Subject Code:172205 Date:28 -04-2018
Subject Name: Rock Slope Engineering
Time: 02:30 pm to 05:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) What is pre ? reinforcement? List out different stabilization techniques by
rock reinforcement. Write a short note on any one.
07
(b) Which geological parameters are used for the site reconnaissance and planning
an investigation program to collect detailed design data for the rock cuts.
07

Q.2 (a) Discuss the basic principles of rock slope engineering for the open ? pit mining
slope stability. Add a note on Socioeconomic consequences of slope failures.
07
(b) Which geological parameters are used for the site reconnaissance and planning
an investigation program to collect detailed design data for the rock cuts?
07
OR
(b) Explain the affect of ground water flow in unstable slope design of rocks. 07

Q.3 (a) Give Hoek-brown strength criteria for rock masses. 07
(b) Which precautions should be taken to avoid excessive back break with
respect to production blasting? Explain pre ? shearing and cushion blasting.
07
OR
Q.3 (a) Write a note on Buttresses ? as a reinforcement method for stabilization of
rock slope.
07
(b) Give the general conditions for plane failure in a rock slope. Add a note on
analysis of failure on a rough plane.
07

Q.4 (a) Write the different principles of rock slope engineering and explain any one. 07
(b) Explain load and resistance factor design method for rock slopes. 07
OR
Q.4 (a) Explain reinforcement with fully grouted untensioned dowels. 07
(b) Write a note on limit equilibrium analysis for the stability of rock slopes. 07

Q.5 Write note on any two : 14
1. Ground water in rock slope.
2. Bishop?s and janbu?s method for slices.
3. Back analysis of slope failure.
4. Ground vibrations.

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