Civil Engineering MCQAE Level Civil Engineering
The Mohr-Coulomb failure criterion states that shear stress at failure on the failure plane equals:
Soil MechanicsMohr-Coulomb CriterionMEDIUM
Choose the correct answer
A
τ_f = σ_n × tanφ
B
τ_f = c + σ_n' × tanφ'
C
τ_f = c + u × tanφ
D
τ_f = (σ₁ - σ₃)/2
Correct Answer
B. τ_f = c + σ_n' × tanφ'
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Mohr-Coulomb: τ_f = c' + σ_n' × tanφ' (in terms of effective stresses), where c' = effective cohesion, φ' = effective friction angle, σ_n' = effective normal stress on failure plane.
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