Question: A CU triaxial test with c = 20 psi is performed on a sand and a deviator stress of 80 psi fails the specimen. Previous

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

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