Mohr-Coulomb Shear Strength of Soil
Mediumshear strengthMohr-Coulomb
A soil has effective-stress strength parameters c′ = 10 kPa and φ′ = 30°. At effective normal stress σ′ = 100 kPa, what is its Mohr-Coulomb shear strength?
- A50 kPa
- B57.7 kPa
- C67.7 kPa
- D110 kPa
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Answer: C. 67.7 kPa
τf = c′ + σ′ tan φ′ = 10 + 100 tan 30° = 10 + 57.735 = 67.7 kPa. The cohesion term must be added to the frictional contribution.
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