Thermo-Hydromechanical Coupling Responses Driven by a Central Heat Source in Unsaturated Soils

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.

Experimental study on moisture and heat migration and deformation properties of unsaturated soil column under a temperature gradient during rainfall infiltration

“…These phenomena involve the combined effects of temperature gradient, rainfall infiltration and deformation of the soil, which are complex thermo-hydro-mechanical coupling problems. Temperature gradients are generated in the soil under the action of solar radiation [3][4][5][6][7], which will induce moisture migration and affect thermo-hydro-mechanical behavior of the soil [8][9][10][11][12]. While rainfall infiltration will change the moisture distribution in soil, leading to the reduction of soil strength and even soil instability [13,14].…”