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Microstructure-Based Random Finite Element Simulation of Thermal and Hydraulic Conduction Processes in Unsaturated Frozen Soils
The freeze-thaw cycles in unsaturated frozen soils can cause serious damage to civil infrastructure. In this paper, a microstructure-based four-phase clay model is generated in Matlab. The model is then converted into a finite element software Comsol. The thermal, hydraulic and mechanical properties of each phase (soil particle, ice, water and air) of the clay are applied randomly to each pixel of the image model based on the volumetric content of each phase. The simulation results show that: (1) The thermal and hydraulic flow are observed during the freeze-thaw cycle. (2) The temperature, matric suction and potential head are obtained during the thawing process of the clay model. (3) The internal stress distribution versus time are calculated during the freezing process. The simulation results agree well with the engineering experience, which provides a simulation model to microstructurally analyze the thermal, hydraulic and mechanical properties of unsaturated frozen soils.
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