Mohr-Coulomb Failure Criterion
Fundamental :
Mohr's theory of failure postulates that rupture begins at a point in a material when the shear stress on the failure plane depends only on the normal stress, i.e., .
The corresponding curve is called the intrinsic curve. The Mohr-Coulomb failure criterion (shear strength of a soil) is expressed as:
Where:
-: Cohesion (shear strength under zero normal stress).
- : Angle of internal friction.
- : Soil tensile strength.
Note :
The failure envelope curve is the envelope of all Mohr circles drawn for failure under different loading conditions.
