Download GTU B.Tech 2020 Winter 5th Sem 2152204 Rock Mechanics Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 2152204 Rock Mechanics Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:2152204 Date:03/02/2021
Subject Name:Rock Mechanics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Difference between rock and rock mass.
03

(b) How rock mechanics is helpful in mining excavations?
04

(c) Explain in details types of waves
07





Q.2 (a) What is RQD? Find the RQD in percentage with given data, in a borehole log
03
of 1.5 m length, recovery of rock cores in cm is given here 12, 8, 10, 2, 6, 4,
10, 13.

(b) What is porosity? A dry rock sample of diameter 54 mm and length 100 mm
04
weight 300 g. After saturation its weight increased to 330 g.
The specific gravity of the liquid is 1.05. Find the porosity of the rock sample
with given data.

(c) Explain with neat sketch: Tri-axial test
07




Q.3 (a) What is uniaxial compressive strength and how it is important in rock
03
mechanics?-

(b) List out the factors which affects the rock strength.
04

(c) Explain in details : Hardness
07




Q.4 (a) Explain the property of rock : Degree of saturation
03

(b) Discuss in brief how to measure the density of rock.
04

(c) Explain in details : Shear box test
07
Q.5 (a) Explain : Anisotropy
03

(b) List out the ISRM standards for a rock specimen.
04

(c) What is Creep? Explain how to measure it?
07



Q.6 (a) Explain in brief : Elasticity and Plasticity
03

(b) Explain: (a) Young's modulus and (b) Modulus of rigidity
04

(c) Discuss the Griffith's theory of fracture in rock mass.
07
Q.7 (a) Which instrument is used to measure water pressure in soil? Discuss it
03
briefly.

(b) Write a note on engineering classification of soil.
04

(c) Discuss in brief the physical properties of soil.
07



Q.8 (a) Difference between soil and rock.
03
(b) Types of failure.
04
(c) How ground water is influence on rock and soil? Discuss in detail.
07

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