Computational multiphysics modeling of long-term problems in geotechnical engineering

Abstract

Multiphysical coupling – the interactions among different physical phenomena such as solid deformation, fluid flow, and chemical reactions – often triggers long-term problems in geotechnical engineering. Examples range from long-term settlement of clayey grounds to weathering degradation of rocks. These problems are very challenging to address, because they require the characterization and prediction of multiphysical processes in geomaterials over a very long time period. This paper describes some computational models recently developed for addressing coupled multiphysical processes in long-term problems in geotechnical engineering. Specifically, we present two models: (1) a multiscale hydro-mechanical model of fluid-induced secondary compression and (2) a chemo-hydro-mechanical model of salt weathering damage. For these models, we outline the key aspects of the formulations and briefly present representative numerical examples. The results of these examples demonstrate that the models can simulate complex multiphysical processes in long-term geotechnical problems based on physical principles.