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Implementation of an Isotropic Elastic-Viscoplastic Model for Soft Soils Using COMSOL Multiphysics

M. Olsson1 T. Wood1 C. Alén1
1Division of GeoEngineering, Chalmers University of Technology, Gothenburg, Sweden

Failure surface (green) and reference surface (red) visualized in principal stress space.

In this paper a elastic-viscoplastic (creep) model is implemented in COMSOL 4.2a and 4.3 and benchmarked against another commercial finite element software package with a very similar material model. It is also validated against commonly performed laboratory tests such as Constant Rate of Strain oedometer tests (CRS) and K0-Consolidated Undrained triaxial tests (K0CU). The implementation in COMSOL is conducted by using a fully coupled analysis between the Solid Mechanics node, Darcy´s Law node and a distributed ODE node. The ODE node is used to simulate the creep contribution. The model implemented provides a material model that works as anticipated and can capture many important features of soft soil behavior.

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