Mining Engineering
GATE MN topic:geomechanics PYQs
Build your understanding with focused practice from past exam papers.
How to practice topic:geomechanics
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 58. Imported answers require independent review unless marked reviewed.
Question 22
Open questionMNMCQ1 markNeeds review
In a Slake Durability Index (SDI) test, a rock sample of 500 g undergoes two standard cycles of wetting and drying. The mass of the sample retained after the test is 400 g. The SDI of the sample, in %, is
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Results from the permeability test of rock samples, E, F, and G are shown. The correct order of hydraulic conductivity (k) of the rock samples is
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Open questionMNMCQ2 marksNeeds review
The in-situ stresses are determined by Flat-jack method by making three slots (P, Q, and R) on the wall (ABCD) of a mine gallery as shown. The in-situ stresses
,
, and
are determined at slot-P, slot-Q, and slot-R, respectively. If
and
, the shear stress on the wall is 
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Open questionMNNAT2 marksNeeds review
In a bench blasting, as shown, 49 kg of explosive is put in each hole. The detonation time of holes, in millisecond, and the associated scale distance (SD) vs. peak particle velocity (PPV) plot for the given blast pattern is shown. The PPV at a distance of 100 m, in mm s
, is ____________. (rounded off to two decimal places)
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In a uniaxial compressive strength test, a 120 Ω strain gauge of gauge factor 2.0 is pasted on the rock sample as shown. At the end of the test, the change in resistance of the strain gauge is 0.5 Ω. The longitudinal deformation of the sample, in mm, is ________________. (rounded off to two decimal places)
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The major (
) and minor (
) principal stresses and the maximum shear stress (
) are related as
The magnitude of normal stress on the plane where
acts isYour answerChoose one option.
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In a Brazilian test, the front view of a homogeneous rock sample is shown in the figure. The failure initiates at the point
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Hydraulic fracturing method is used to determine the major principal stress (
) in an underground rock strata having tensile strength of 6 MPa. The minor principal stress (
) in the strata is 8 MPa. If fluid pressure of 10 MPa is required to fracture the vertical bore in that strata, the magnitude of
, in MPa, is _____ (rounded off to 2 decimal places)Log in to check the answer
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The unadjusted RMR of a tunnel roof is 64. A single joint set exists in the roof as shown in the figure.
Using the abridged RMR table for adjustment orientation, the RMR is _____ (in integer)
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A triaxial test on a sandstone sample is conducted at a confining pressure of 10 MPa. The elastic axial and volumetric strains at axial stress of 50 MPa are recorded to be
and
respectively. The modulus of elasticity, in GPa, and Poisson’s ratio of the sample, respectively are close toYour answerChoose one option.
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