Consider the analysis of tunnel bolting leading to the equation If bolting is on a square pattern of spacing S and a 45? cone of influence is assigned to the bolt forces, show that this equation is equivalent to that of Bischoff and Smart (1977), equation 8, where provided a

Mohr-Coulomb yield condition is assumed for the rock. Equation 8 is per foot of tunnel length.

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Co ATA Phtl To (L-S) ATA = (9) (L - S)