Thermo-Hydro-Mechanical Coupling Model of Saturated Clay
摘要
As mentioned in the introduction, many practical engineering problems involve the temperature effect of soil, mainly the thermo-hydro-mechanical (THM) coupling problem of rock and soil, which is also a key research problem in the academic field of geotechnical engineering. Currently, many scholars [1–11] have conducted extensive experimental research on this issue and achieved considerable research results. Especially in terms of the thermal response of saturated clay caused by temperature, for example, irreversible thermal strain occurs after a temperature cycle, and the magnitude of thermal strain increases with the number of cycles. Normal consolidated soil will undergo thermal shrinkage when heated, while overconsolidated soil is prone to thermal expansion when heated. As the temperature increases, thermal expansion tends to transform into thermal shrinkage. When the temperature is raised without drainage, it will cause positive pore water pressure, while when the temperature is lowered without drainage, it will produce negative pore water pressure, and the dissipation of pore water pressure is an important factor leading to irreversible volume deformation. In terms of theoretical research, the main focus is on the mechanism of temperature-induced thermal response changes and the study of soil thermal water coupling models. Zhang [12] proposed a THM coupling model for saturated clay based on the theory of particle matter fluid dynamics, which does not require concepts such as flow laws and yield surfaces. Bai Bing et al. [13–15] conducted a systematic study on the thermal solidification characteristics of saturated clay, and obtained the evolution laws of pore water pressure and thermal strain of saturated clay under different temperature paths and boundary conditions. They also derived a theoretical solution method for saturated porous media with hollow cylinders containing internal heat sources.