What range of joint dip is unsafe with respect to joint slip


Question:

Suppose that the pillar stress is 4,247 psi in a room and pillar mine and that a joint set is present with an average bearing of N45W. If the joints obey a Mohr-Coulomb slip criterion and have a friction angle of 35? and a cohesion of 600 psi, what range of joint dips is unsafe with respect to joint slip?

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