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| Study on water and salt migration and deformation properties of unsaturated saline soil under temperature gradient |
| ZHOU Fengxi1，2，ZHOU Lizeng1，WANG Liye1，LI Shuangyang2 |
| (1. College of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；2. State Key Laboratory of Frozen Soil Engineering，Northwest Institute of Eco-environment and Resources，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China) |
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Abstract Based on the porous media theory and the continuum mechanics，a fully coupled water-heat-salt-force multi-field model for unsaturated saline soil under temperature gradient is established. The model obeys the conservation laws of mass，energy and momentum of the three-phase system of solid，liquid and gas，takes into account the influences of porosity evolution，water seepage，gas transport，salt desorption-adsorption effect and compressibility of solid particles and pore fluids，and hence，can more accurately describe and explain the heat and mass migration processes and deformation characteristics in unsaturated saline soil. In addition，by selecting the basic unknowns such as porosity，pore water pressure，pore gas pressure，temperature，salt content and displacement，the above multi-field coupling process is simulated by using Comsol Multiphysics software. The mathematical model and simulation results are verified by the experimental results. The results show that the model can well reveal the water and salt migration mechanism and deformation mechanism of unsaturated saline soil under temperature gradient. At the same time，the process of numerical analysis has further deepened the understanding of water and salt migration and deformation processes of saline soil. The study of salt adsorption also provides theoretical preparation for further study of salt expansion of saline soil.
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2020, Vol. 39 
