Study of thermo-hydro-mechanical coupling model in U-shaped GSHP

Ground source heat pump (GSHP) is a new type technology for the use of the superficial layer energy. According to the law of conversation of energy and the law of conversation of mass, the equation of heat transfer, the equation of seepage, the equation of continuity and the constitutive equation of thermo-hydro-mechanical (THM) are established respectively. The whole displacement and deformation diagram of single-well and the failure criterion are obtained through simulating the flow zone with software COMSOL. The results indicate that: (1) The pressure gradient increases with elevated distance from the well, and trends to a steady value eventually. (2) The goodness of fit is good by comparing the result obtained from the heat transfer model and actual engineering measurement, which shows the reasonability and validity of the thermo-hydro-mechanical coupling model.