U型地源热泵系统热-流-力学耦合模型研究

地下水源热泵井（ground source heat pump，简称GSHP）是一种新型的浅层能源利用技术。基于能量守恒方程和质量守恒方程，建立单井热泵系统的热传递方程、渗流方程、连续性方程以及THM（thermo-hydro-mechanical）耦合本构方程。通过COMSOL软件，对单井系统周围区域进行流动模拟，得到井体的整体热位移变形图和破坏准则图。研究结果表明，(1) 水压力梯度随着井体半径的增加而变大，最终趋于一个稳定的值；(2) 热传递模型的理论计算结果和工程现场的实测值具有较好的吻合性，证明该模型的合理性和有效性。

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.