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
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.