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Rock Mechanics and Rock Engineering MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Rock Mechanics and Rock Engineering. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Rock Mechanics and Rock Engineering chapter is particularly important for students studying Geological engineering. Page-3 section-1

Each section contains 100 MCQs on Rock Mechanics and Rock Engineering .
21
What is the name of the failure surface where shear displacement occurs in rock?
Discuss
Answer & Solution
Answer: Option B
Solution:
A shear zone is a region along which shear displacement and failure occur in rock, often seen in faulting or slope failure.
22
What does the Hoek-Brown criterion estimate?
Discuss
Answer & Solution
Answer: Option C
Solution:
The Hoek-Brown failure criterion is an empirical method to estimate rock mass strength, especially where RMR or GSI is known.
23
Which of the following is not a mechanical property of rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Density is a physical property, while elasticity, cohesion, and Poisson�s ratio are mechanical properties describing deformation or strength.
24
Which parameter describes the stiffness of rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Modulus of elasticity (Young�s modulus) indicates how much a rock will deform under stress�i.e., its stiffness.
25
What does �intact rock� refer to in rock mechanics?
Discuss
Answer & Solution
Answer: Option C
Solution:
Intact rock is a solid portion without joints or fractures, used in lab testing to determine basic rock strength properties.
26
Which method is commonly used to support tunnels in weak rock?
Discuss
Answer & Solution
Answer: Option A
Solution:
Shotcrete is sprayed concrete applied directly to rock surfaces to prevent collapse in weak rock zones.
27
What factor is considered in rock slope stability but not in soil slope stability?
Discuss
Answer & Solution
Answer: Option B
Solution:
In rock slope stability, joint orientation critically affects failure mechanisms, which is less relevant in homogeneous soils.
28
The term �overbreak� in tunneling refers to:
Discuss
Answer & Solution
Answer: Option B
Solution:
Overbreak is the excess removal of rock beyond the tunnel design profile, often due to blasting or weak zones.
29
Which index measures the roughness of a joint surface?
Discuss
Answer & Solution
Answer: Option A
Solution:
Joint Roughness Coefficient (JRC) quantifies the irregularity of a joint surface, affecting shear strength of rock joints.
30
Rock reinforcement using steel mesh is often combined with:
Discuss
Answer & Solution
Answer: Option C
Solution:
Steel mesh is typically used with shotcrete to enhance surface support in rock tunnels or slopes, preventing rockfalls.