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考虑岩体裂隙渗流变水温影响,推导单裂隙变水温水流近似解析解和有限元解,在此基础上分别建立裂隙二维网络变水温渗流数值求解方程,分别对应裂隙网络变水温渗流分析的近似解析法和子结构法。分析变温水流运动规律发现:(1)单裂隙内水流水头与水力坡降成非线性关系,当水流由高温区向低温区流动时,水头分布曲线为凸曲线,此时按线性渗流简化水头整体偏小;当由低温区向高温区流动时,水头分布曲线为凹曲线,此时按线性渗流简化水头整体偏大。(2)单裂隙内,高水温处水力坡降小,低水温处水力坡降大;裂隙平均水温越高,流速越快;裂隙网络内存在与裂隙宽度相似的温度偏流效应,即交叉节点水流有偏向水流温度高的裂隙流动的趋势。在温度较高和温度梯度较大的区域,应该考虑水流温度变化对渗流场的影响。
Considering the effect of rock mass fissure seepage change water temperature and temperature, the approximate analytic solution and finite element solution of single fissure water flow and temperature water flow are deduced. Based on these, the numerical solution equations of water temperature and temperature seepage flow in fissure two-dimensional network are established respectively. Analytical and substructural methods. The results show that: (1) The water head in a single fracture has a nonlinear relationship with the hydraulic gradient. When the water flow from high temperature region to low temperature region, the head distribution curve is a convex curve. At this time, the head The overall smaller; when the flow from the low temperature zone to the high temperature zone, the head distribution curve is concave curve, at this time according to the linear seepage flow simplifies the overall head is too large. (2) Within a single fracture, the hydraulic slope decreases at a high water temperature and the hydraulic slope decreases at a low water temperature. The higher the average water temperature in the fracture, the faster the flow rate. The temperature drift effect similar to the fracture width exists in the fracture network, that is, There is a tendency that the fissures flowing at high temperature tend to flow. In the areas with high temperature and large temperature gradient, the influence of temperature changes on the seepage field should be considered.