A soil sample is tested to failure in a drained triaxial test using a cell pressure of 200kN/m2. The effective stress parameters of the soil are known to be 4>' = 29° and c' = 0.

Determine the inclination of the plane of failure, with respect to the direction of the major principal stress, and the magnitudes of the stresses that will act on this plane. What is the maximum value of shear stress that will be induced in the soil?

Answer Failure plane inclined at 30.5° to major principal stress. Effective normal stress on failure plane = 310kN/m2. Shear stress on failure plane = 170kN/m2. Maximum shear stress = 190kN/m2.

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