Mohr–Coulomb Failure Criterion

List of Symbols a (m 1)/(m ? 1) b 1/(m ? 1) c Cohesion C0 Uniaxial compressive strength m (1 ? sin /)/(1 sin /) S0 Inherent shear strength (cohesion) T Uniaxial tensile strength T0 Theoretical MC uniaxial tensile strength / Angle of internal friction l = tan / Coefficient of internal friction r Normal stress on plane s Shear stress on plane r1, r2, r3 Principal stresses, with no regard to order rI, rII, rIII Major, intermediate, minor principal stresses rm (rI ? rIII)/2 sm (rI rIII)/2 rI * C0 mT rIII * -T 1 Description