COUPLED HEAT, WATER AND GAS-FLOW IN DEFORMABLE POROUS-MEDIA

A fully coupled numerical model to simulate the slow transient phenome na involving heat and mass transfer in deforming porous media is devel oped, It makes use of the modified effective stress concept together w ith the capillary pressure relationship, The heat transfer through con duction and convection as well as the latent heat transfer (evaporatio n and/or condensation) is taken into account. The governing equations in terms of displacements, temperature, capillary pressure and gas pre ssure are coupled non-linear differential equations and are solved by the finite element method. The model is validated with respect to a do cumented experiment on semisaturated soil behaviour. Two other example s involving subsidence due to pumping from a phreatic aquifer and ther moelastic consolidation of saturated and semisaturated media are also presented.