Numerical simulation of surface subsidence and heave in water saturated/unsaturated soil

Abstract eng:
A multi-phase model for predicting surface subsidence and heave caused by changes of the groundwater table is presented. The employed multi-phase model allows considering the interactions between the air flow and water flow in the water saturated/unsaturated soil regions and the nonlinear response of the unsaturated/saturated soil. Special attention is paid to the implementation of the model into a parallelized multi-phase FE code and to the efficient iterative solution of the resulting nonlinear system of equations. The application of the model is demonstrated by a large-scale 3D numerical simulation of subsidence induced by groundwater withdrawal.

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