A consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle, $', of 28%....

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A consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle, $', of 28%. If the all-around confining pressure during the test was 140 kN/m2, what was the major principal stress at failure? A consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle, $', of 28%. If the all-around confining pressure during the test was 140 kN/m2, what was the major principal stress at failure?

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