Question: The same sand as in Problem 12.8 is tested in a direct shear apparatus under a normal pressure of 390 kPa. The specimen fails when

The same sand as in Problem 12.8 is tested in a direct shear apparatus under a normal pressure of 390 kPa. The specimen fails when a shear stress of 260 kPa is reached. Determine the major and minor principal stresses at failure and the angle of shearing resistance. Plot the Mohr diagram.

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