蒲石河抽水蓄能电站上库三维渗流数值模拟

3-D numerical simulation of seepage in the upper reservoir of the Pushihe pumped-storage power station

根据蒲石河抽水蓄能电站上库的地质及水文地质条件,建立了裂隙岩体三维渗流数值模拟模型,计算分析了水库-岩体系统地下水运动规律及各种运行工况下的上库渗漏量和渗流场的分布特征。将模拟计算区地下水流系统概化为非均质各向异性三维稳定地下水流系统,综合利用压水试验得到的平均渗透系数值和统计学方法得到的渗透张量方向,获得裂隙岩体的渗透系数张量。数值模拟结果表明,正常蓄水位运行工况下,整个库区均未进行防渗处理时,上库总渗漏量为5832.92m3/d,防渗后渗漏量减少了3571.27m3/d。

Based on the geologic and hydrogeologic conditions of the upper reservoir of the Pushihe pumped-storage power station, a 3-D numerical simulation model of fractured rock was established to calculate and analyze the groundwater movement regularity of the reservoir-rock system, and the leakage volume and distribution characteristics of the flow field under various operating conditions. The groundwater system of the calculation area was conceptualized as 3-D heterogeneous anisotropic steady flow, and the permeability tensor of the fractured rock was obtained by combining water pressure test （gaining the average permeability value） and statistic method （gaining the directions of permeability tensor）. The simulation results show that the total leakage volume of the upper reservoir will be 5 832.92 m^3/d under the operation condition of the normal pool level if the whole reservoir area has no anti-seepage treatment, and it will reduce by 3571.27 m^3/d after seepage prevention, which accounts for 0.22‰ of the effective storage. The results provided basis and reference for design and decision.