三维复杂裂隙岩体渗流传热耦合的数值研究  

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

作　　者：邵玉龙 姚池[1,2] 漆宾宾 周创兵 Shao Yulong;Yao Chi;Qi Binbin;Zhou Chuangbing(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330033,P.R.China;Jiangxi Key Laboratory of Tailings Reservoir Engineering Safety,Nanchang 330000,P.R.China)

机构地区：[1]南昌大学建筑工程学院,南昌330033 [2]江西省尾矿库工程安全重点实验室,南昌330033

出　　处：《地下空间与工程学报》2021年第4期1063-1071,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(U1765207,41762020,51969015);江西省自然科学基金(20181BCD40003,20192ACB20020,20192ACB2102);江西省研究生创新基金(YC2019-S034)。

摘　　要：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的渗流传热耦合过程进行了研究,研究发现:裂隙网络是主要的导水通道,在贯通裂隙簇中出现了明显的优势流,大量的流体在流经基岩的途中与会周围的高温岩体进行热量交换,导致在裂隙网络贯通区域的岩体首先温度下降,形成一条低温带,然后由于岩体的热传导作用,低温带再向四周进行扩散。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.

关 键 词：裂隙岩体 离散裂隙网络模型 渗流传热耦合 数值模拟 

分 类 号：TV139.1[水利工程—水力学及河流动力学]