Mining Engineering > GATE 2018 > Underground Coal Mining
The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m×1.2 m grid pattern. If the unit weight of roof rock is 2.25 tonne/m3 and load carrying capacity of each bolt is 7.5 tonne, the factor of safety of the support system is ___________.
Correct : 1.4
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