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A normally consolidated clay is consolidated under a stress of 100 kPa, then sheared undrained in...

A normally consolidated clay is consolidated under a stress of 100 kPa, then sheared undrained in a triaxial compression. The principal stress difference (deviatoric stress) at failure is 250 kPa and the induced pore pressure is 60 kPa. Calculate the minor principal stress at failure in term of effective stress (s3')f? (Unit: kPa).

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