A CU triaxial test with sc = 20 psi is performed on a sand and a deviator stress of 80psi fails the

A CU triaxial test with σc = 20 psi is performed on a sand and a deviator stress of 80psi fails the specimen. Previous tests revealed that the effective friction angle for thissand is 35°. Calculate the pore water pressure at failure.

 
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