Suppose that the pillar stress is 29 MPa in a room and pillar mine and that a

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Suppose that the pillar stress is 29 MPa 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 4 MPa, what range of joint dips is unsafe with respect to joint slip?

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