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碾压混凝土坝渗流属于有浸润面的自由渗流,如何准确地确定浸润面位置是自由渗流场分析的关键及难点。同时,目前大坝渗流研究中多对地质条件、坝体细节以及排水孔进行较大程度的简化处理。针对上述问题,本文建立了包含不同地层、不良地质体、帷幕、排水孔以及坝体的碾压混凝土坝三维统一模型,采用耦合VOF法的三维非稳态水气两相流渗流模型,实现了对碾压混凝土坝复杂自由渗流场的数值模拟。运用该模型模拟某水电站碾压混凝土坝段正常蓄水位下的渗流场,结果表明:防渗帷幕和排水孔能够有效地改善渗流场分布,渗流控制作用明显;上游帷幕处的水力梯度最大值达到32.64,可能会对帷幕造成破坏,应引起足够重视。最后将现场监测点水头和排水孔出水量的模拟值与现场实测值进行对比,平均误差分别为1.57%和8.70%,模拟值与现场实测值基本吻合,验证了该模型的可靠性。
The seepage of RCC dam belongs to free seepage with infiltration surface. How to determine the infiltration surface accurately is the key and difficult point in the analysis of free seepage flow field. At the same time, at present, many studies on dam seepage have simplified the geological conditions, dam details and drainage holes to a large extent. In view of the above problems, a three-dimensional unified model of roller compacted concrete dam with different formations, poor geologic bodies, curtains, drainage holes and dam bodies is established in this paper. By using coupled VOF method, the seepage model of three- Numerical Simulation of Complex Free Seepage Field of Roller Compacted Concrete Dam. The model is used to simulate the seepage field under a normal water level of a RCC dam. The results show that the seepage curtain and the drainage hole can effectively improve the seepage field distribution and the seepage control effect is obvious. The maximum hydraulic gradient at the upstream curtain Reached 32.64, may cause damage to the curtain, should cause enough attention. Finally, the simulation results of the water head and the drainage hole in the monitoring spot of the scene are compared with the measured values in the field, with the average errors of 1.57% and 8.70% respectively. The simulation values are in good agreement with the measured values in the field and the reliability of the model is verified.