Parameteridentification of Hostun-Sand and Shear-Band Simulation of Landsliding

The simulation of deformation process of landsliding needs the knowledge of the very complex behaviour of granular materials, e. g., sand. The triax experiments on sand show a highly non-linear elasto-plastic material behaviour. Therefore, it is necessary to use a yield criteria, e. g., single-surface yield criteria with isotropic hardening and non-associated plastic potential, which satisfies adequately the requirements of the material properties. This kind of material behaviour can be described by an elasto-plastic material law in the frame of Theory of Porous Media, which is implemented in the FE tool PANDAS. By means of the data of Hostun-Sand, the material parameters of the singlesurface yield criteria are determined by use of a optimization algorithm, namely Sequential Quadratic Programming (SQP) a gradient based optimization method, which is coupled with PANDAS. Using this optimized material parameters, a simulation of a initial boundary-value problem of landsliding is presented. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)