Numerical description of elastic-plastic behavior of saturated porous media

In this paper, the numerical description of the elasto-plastic behavior of saturated porous materials, consting of a solid skeleton with liquid filled pores, will be discussed. In particular, frictional materials will be desc ribed which show small elastic but mostly plastic deformations. The elastic-plastic deformable solid skeleton and the liquid are assumed to be incompressible, where the liquid does not exhibit viscous properties. The description of the stress state is done within the framework of the geo metrically-linear theory, because small deformations are assumed. The elast ic strain state shall be expressed by Hooke's law and the plastic strain st ate with the help of a single surface yield criterion as well as a non-asso ciated flow rule. The numerical description of the initial- and boundary-value problems is do ne by the finite element method within the framework of the standard Galerk in procedure.