Determine the friction angle is this the critical state


A CU test on a stiff, over consolidated clay at a constant cell pressure of 150 kPa gave a peak deviatoric stress of 448 kPa. The corresponding excess pore water pressure was -60 kPa. Determine the friction angle. Is this the critical state friction angle? Explain your answer.

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Civil Engineering: Determine the friction angle is this the critical state
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