The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m
The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m

Q. The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m x 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       .

Ans: 1.4-1.6
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