Mining Engineering
GATE MN Geomechanics PYQs
Build your understanding with focused practice from past exam papers.
Questions 41–50 of 58. Imported answers require independent review unless marked reviewed.
Question 40
Open questionMNNAT2 marksNeeds review
The equation for peak particle velocity (PPV) from blast induced ground vibration is given by
, where
and
are site constants.In a field study, the following readings are recorded.
Sensor No. | PPV in mm/s | Sensor distance from blast site (D) in m | Charge per delay (Q) in kg |
|---|---|---|---|
1 | 5.5 | 200 | 100 |
2 | 3.4 | 300 | 100 |
The value of
is ________ (round off to 3 decimal places).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 43
Open questionMNNAT2 marksNeeds review
The slip circle of radius 30.0 m in an overburden slope is shown with the centre of slip circle at point O. The tension crack is completely filled with water. For one meter width of the slope, the moment exerted by the force of water about O in kN-m is ________ (round off to 1 decimal place).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 1
Open questionMNMCQ1 markNeeds review
Shear strength of rock joint is NOT dependent on
Your answerChoose one option.
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Open questionMNMCQ1 markNeeds review
A flat longwall panel is mined out at an area having subsidence factor
. The measured maximum subsidence on the surface is
for a mining height of
. The subsidence is sabrical ifYour answerChoose one option.
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The major and minor principal stresses at a point are 25 MPa and -5 MPa respectively. The maximum shear stress, in MPa at that point is ______.
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Open questionMNNAT1 markNeeds review
In a slake durability test, mass of the drum with samples before the test and mass of the drum with oven-dried samples after the test are 1.52 kg and 1.48 kg respectively. If the mass of the drum is 1.05 kg, slake durability index in percentage (rounded off to two decimal places) is __________.
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Open questionMNNAT2 marksNeeds review
The uniaxial stress-strain behavior of a rock sample is shown in the figure.
The elastic modulus E is 20,000 MPa. If
is the plastic strain, the value of the damage parameter D (rounded off to two decimal place) is _____.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 51
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The insitu stress field around a circular tunnel is shown in the figure.
Points A and B are located at the boundary of the tunnel. If the tangential stress at Point A is 3 times of that at Point B, the value of insitu stress ratio, k is _____.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionMNNAT2 marksNeeds review
A joint plane dipping at 30° intersects the slope edge and the crest as shown in the figure below.
The unit weight of rock is 25 kN/m
, and cohesion and friction angle of the joint surface are 40 kPa and 25° respectively. The safety factor of the shaded block (round off to two decimal places) is _____.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 6
Open questionMNMCQ1 markNeeds review
The property that CANNOT be determined from uniaxial compressive strength test of a rock sample fitted with strain gauges is
Your answerChoose one option.
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