The influence of fluid phase on soil instabilities is investigated using modified Cam-clay model. The results of numerical tests for one-phase (drained, undrained) and two-phase medium are compared. Mesh-dependence of numerical results is prevented by a gradient enhancement of the model. The influence of permeability on the stabilizing role of the fluid phase is also assessed. Calculations are performed using the development version of the FEAP finite element package.
Two-phase medium, finite element method, plasticity, Cam-clay model, gradient regularization, localization