A rock follows Mohr-Coulomb failure criterion. Which one of the Mohr-Coulomb failure envelopes

A rock follows Mohr-Coulomb failure criterion. Which one of the Mohr-Coulomb failure envelopes

Q. A rock follows Mohr-Coulomb failure criterion. Which one of the Mohr-Coulomb failure envelopes shown below allows failure of the rock under stress state Y, but not under stress state X?

(A) PP’                      (B) QQ’                     (C) RR’                      (D) SS

Ans: PP’

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