In a Mohr-Coulomb failure envelope failure occurs when

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In a Mohr-Coulomb failure envelope, failure occurs when:

A. Normal stress increases

B. Pore pressure decreases

C. Shear stress exceeds cohesion

D. Shear stress exceeds shear strength

Answer: Option D

Failure in rocks under the Mohr-Coulomb criterion occurs when shear stress exceeds shear strength governed by cohesion and friction.

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