Mining Engineering > GATE 2026 > Rock Mechanics - In-situ Stress Measurement
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 σP, σQ, and σR are determined at slot-P, slot-Q, and slot-R, respectively (slot-P vertical, slot-Q horizontal, slot-R at 45°). If σP > σQ, and σR = 0, the shear stress on the wall is
Correct : c
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