Question: B . A limestone mine uses 1 . 8 m long mechanically anchored rock bolts tensioned to 7 0 kN as roof support for its

B. A limestone mine uses 1.8 m long mechanically anchored rock bolts tensioned to 70 kN as roof support for its 12 m-wide entries. The density of the rock is
2550 kg/m^3. From the pull tests performed, the bolt capacity has been established as 10 tonnes and the bolt spacing is 1.2 m on a square pattern.
1. Determine the support pressure provided to the rock by this support system?
2. What is the height of the roof strata supported by this support system?
3. If there is a weak horizontal bedding plane at 0.6 m into the roof, what is the safety factor for this support system in stabilizing the immediate roof?

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