三维复杂裂隙岩体渗流传热耦合的数值研究

将复杂裂隙岩体视为由离散裂隙网络和岩石基质两部分组成,采用四面体单元离散岩石基质,无厚度三角形单元离散复杂三维离散裂隙网络,考虑温度对流体密度和动力粘度的影响,建立了描述三维裂隙网络的裂隙岩体渗流-传热耦合模型.通过与二维单裂隙渗流-传热耦合问题的解析解对比,验证了该模型的可靠性.随后,利用该模型对复杂三维随机裂隙岩体...

Numerical Study on Coupling of Seepage and Heat Transfer in 3D Complex Fractured Rock Masses

The fractured rock masses is considered to be composed of two parts: discrete fracture network and rock matrix. Discrete rock matrix with tetrahedral elements and discrete three-dimensional discrete fracture network without thickness triangle elements. Considering the influence of temperature on fluid density and dynamic viscosity, the obvious hydro-thermal coupled model of a fractured rock masses in a three-dimensional fracture network is funded. The reliability of the model is verified by comparison with the analytical solution of the two-dimensional single-fracture hydro-thermal coupling problem.The relative permeability of the fractures and rock matrix are discussed. The study shows that the fracture network is the main water conduit. A distinct dominant flow occurs in the through-fracture cluster, and large amounts of fluid exchange heat with the surrounding hot rock mass on its way through the rock matrix, leading to the first temperature drop in the rock mass in the fracture network, a low temperature zone is formed, and then the low temperature zone diffuses to the periphery due to the heat conduction of the rock masses.