Material Behavior
An overview of the properties of the modified Mohr-Coulomb model is provided in the corresponding chapter of Theoretical Principles.
Input Dialog Box
In order to represent the material behavior, the model requires the following parameters to be entered.
- φ – Friction angle
- c – Cohesion
- ψ – Dilatancy angle
- E – Modulus of elasticity
- ν – Poisson's ratio
The shear strength parameters—friction angle and cohesion—as well as the dilatancy angle of the soil can be entered in the specific input tab for the Mohr-Coulomb model. This is shown in the image below.
The modulus of elasticity and the Poisson's ratio have to be defined in the “Main” tab, which is shown in the parent chapter Input – Materials of Soil Type.
Additional Notes
Cohesion
When using numerical methods, such as FEM, in geotechnical engineering, it is recommended to always apply a non-zero cohesion. Therefore, a small cohesion between 0.5 and 1.0 kN/m² can be applied even for non-cohesive soils.
Dilatancy Angle
The following relation can be used for the dilatancy angle. [1]