Shear Strength - Theory & Concepts - Mohrs Circle Soil

Mohr-Coulomb failure criterion, shear strength parameters, and laboratory testing methods.

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Mohr-Coulomb Failure Criterion

Stable

Major Stress (σ₁)100

Minor Stress (σ₃)40

Cohesion (c)10

Friction Angle (φ)30 °

If the circle touches or crosses the red failure envelope, the soil fails in shear. The radius of the circle represents the maximum shear stress ( $\tau_{max} = (\sigma_1 - \sigma_3)/2$ ).

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Mohr-Coulomb Failure Criterion

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