According to the problem of leakage bypassing the dam in Wudongde hydropower station and the deficiency of the two-dimensional and quasi-three-dimensional steady flow models, on the basis of the sufficient analysis of geology and hydrogeology characteristics of dam site, a hydrogeology conceptual model is generated; a three-dimensional transient flow numerical simulation model is established, which is solved by the finite difference method and the preconditioned conjugate gradient method.Based on the simulation of the three-dimensional seepage fields under the three working conditions including natural state, normal water storage with impervious curtain and normal water storage without impervious curtain, according to the principle of water balance, the seepage quantities of various schemes in dry and wet season are calculated.The results show that the seepage quantity bypassing the dam on the right bank is about 5.7 times that of the left bank; compared with the system without anti-seepage treatment, the total seepage quantity can reduce by 72.98％ after anti-seepage treatment; the seepage quantities bypassing right and left dam abutments and the dam foundation in wet season are less than those in dry season.It is shown that the convergence speed of the model is fast; and the stability of the model is good.%针对乌东德水电站坝址区水库蓄水后的绕坝渗漏问题及地下水渗流二维和准三维稳定流模型的不足,在充分分析坝址区工程地质和水文地质特征的基础上,概化出乌东德坝址区地下水系统的水文地质概念模型,建立坝址区地下水渗流三维非稳定流数值模型,并采用有限差分法和预处理共轭梯度法对模型进行了求解.在天然工况、有帷幕正常蓄水和无帷幕止常蓄水3种工况坝址区地下水三维渗流场模拟的基础上,根据水均衡原理,计算各种方案枯水期和丰水期坝址区的渗漏量,结果表明,正常蓄水工况下,右岸绕坝渗漏量约为左岸的5.7倍,防渗处理后总渗漏量可减少72.98%,丰水期左、右坝肩和坝基的绕坝渗漏量均较枯水期有所降低.该模型稳定性好,收敛速度快.
展开▼
