Question: With reference to the sketch, verify the cable bolting formula below. If the formula is unsatisfactory, then derive a substitute formula based on a dead

With reference to the sketch, verify the cable bolting formula below. If the formula is unsatisfactory, then derive a substitute formula based on a dead weight load analysis. Here S = spacing (ft, m) assuming a square pattern, N = number of cables per hole, U = ultimate tensile strength (tons, kN), V = specific volume of the rock mass (ft3/ton, m3/kN), T = thickness of suspended rock mass (ft, m), ? =bolting angle from the horizontal, SF = bolt safety factor. Note: this formula appeared in the technical literature some years ago.

NUV T(SF) sin a Vein HW FW Fill

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