Mining Engineering > GATE 2019 > Underground Coal Mining
In a bord and pillar panel, 6 square pillars are developed as shown in the figure below. The depth of the seam is 300 m and the average unit weight of overburden rock is 25 kN/m3 If the pillar strength is 15 MPa, the safety factor of the shaded pillar zone (round off to two decimal places) is _________.
Correct : 1.38
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