Abstract
Based on the thermodynamic and thermoelastic theory, the coupled governing equations of deformation, heat transfer, and moisture migration in unsaturated soils were given. The coupled calculation process was realized by the finite element method. The hydrothermal coupling characteristics of two cases of unsaturated kaolin clay were studied by using a self-developed test device, and the test results were compared with the numerical results. The results showed that when the initial saturation of the soil is high, the volumetric water content of the measured point increases, and then it is in a stable state during the heating process. When the initial saturation is low, the volumetric water content near the heat source increases firstly and then decreases during the heating process. The rise and fall of temperature make the volumetric water content of the soil irreversible. The volumetric water content of each measured point is lower than the initial state. The closer it is to the internal measured heat source, the more obvious this phenomenon is; the lower the initial saturation is, the more obvious it is.
Highlights
IntroductionAkrouch et al [10] discussed the coupled hydrothermal characteristics of energy piles to unsaturated soils by experiments, theory, and numerical simulation and compared the experimental results with analytical and finite element
E hydrothermal coupling characteristics of two cases of unsaturated kaolin clay were studied by using a self-developed test device, and the test results were compared with the numerical results. e results showed that when the initial saturation of the soil is high, the volumetric water content of the measured point increases, and it is in a stable state during the heating process
Based on the combination of thermodynamics and thermoelastic theory, the governing equations with coupled thermo-hydromechanical characteristics as well as state equations of the water-gas two-phase flow in porous media are further given. e coupling calculation process is realized by the finite element method. en, a self-developed test device was utilized to analyse the hydrothermal coupling characteristics of two different unsaturated kaolin clay under the same temperature load, and the obtained experimental results verified the rationality of the proposed theoretical model. is work provides further insight into the hydrothermal effects of kaolin soil from the multifield coupling point of view
Summary
Akrouch et al [10] discussed the coupled hydrothermal characteristics of energy piles to unsaturated soils by experiments, theory, and numerical simulation and compared the experimental results with analytical and finite element. Bai [12] discussed the semianalytical solutions of porous and saturated spheres with cavities under several boundary conditions and compared the effects of thermal response on field variables such as radial displacement, pore pressure, and tangential or radial stress through numerical analysis, which is a pioneering work. En, a self-developed test device was utilized to analyse the hydrothermal coupling characteristics of two different unsaturated kaolin clay under the same temperature load, and the obtained experimental results verified the rationality of the proposed theoretical model. Based on the combination of thermodynamics and thermoelastic theory, the governing equations with coupled thermo-hydromechanical characteristics as well as state equations of the water-gas two-phase flow in porous media are further given. e coupling calculation process is realized by the finite element method. en, a self-developed test device was utilized to analyse the hydrothermal coupling characteristics of two different unsaturated kaolin clay under the same temperature load, and the obtained experimental results verified the rationality of the proposed theoretical model. is work provides further insight into the hydrothermal effects of kaolin soil from the multifield coupling point of view
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