Question: A rock sample has a cohesion ( c ) of 2 0 MPa. In a triaxial compression test, a rock sample fails under a normal

A rock sample has a cohesion (c) of 20 MPa. In a triaxial compression test, a rock sample fails under a normal stress of 100 MPa and a shear stress of 60 MPa. Calculate the angle of internal friction for the rock sample and its shear strength.

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