Abstract：Based on analysis of the water phase change process in porous media，the volumetric ratio of pore water to pore ice versus temperature is studied. A mathematic relation to describe saturated degree of pore water and pore ice undergoing freezing condition is suggested. Through the introduction of effective pore pressure concept，a coupling model based on theory of porous media is studied to simulate the variation of effective pore pressure under low temperature situation. Formulae to be able to calculate the thermal volumetric dilation coefficient of saturated and unsaturated porous media are employed to describe swelling and shrinkage characteristics of freezing porous media. The comparison results between experimental data and simulated solution validate the correctness of the proposal model in this research. It also indicates that this model could simulate the reasonable solution of effective pore pressure and skeleton stress and describe the swelling and shrinkage deformation feature. Therefore the suggested coupling model is a reasonable and effective approach for the study of the deformation and stress of freezing porous media.
