Multisurface Plasticity Models Under Yielding Conditions/Multisurface-plastizitäts-modelle mit zusammengesetzten fliessbedingungen

An implicit integration algorithm for arbitrary multi- surface plasticity is presented. This perfectly-plastic model uses isotrop and anisotrop Mohr-Coulomb criteria with tension-cutoff and associated or non-associated flow rules. So materials with anisotropic deformation and strength behaviour like intact rock with sets of joints can be described. With an extended Drucker-Prager-criterion for the isotrop material matrix this model can be used as well for modelling other materials such as masonry or concrete. Problems resulting from arbitrary multisurface yield criteria are discussed. Consistent numerical algorithms for robust numerical solutions are presented. The Multisurface plasticity model was implemented in a finite-element-program. The example of calculation of a dam on jointed rock mass shows the applicability and new possibilities for the description of anisotropic materials.

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