解析法与数值法在水电站防渗墙效果评价中的运用

四川省大渡河上某水电站目前正处于施工阶段，大坝基坑防渗墙已基本完成施工，但基坑涌水量较大，为评价防渗墙的防渗效果，在两防渗墙间开展了2组抽水试验.根据研究区边界条件，利用综合井函数法初步求取了基坑砂砾层的水文地质参数，并在此基础上采用数值法(groundwater modeling system, GMS)建立水流模型，进行参数的识别、验证，研究表明综合井函数法得到的砂砾含水层渗透系数为19.13~32.24 m/d，GMS拟合得到的渗透系数为26.00 m/d.此外，数值模拟拟合得到的主、副防渗墙渗透系数较小(0.01~0.02 m/d)，说明两防渗墙防渗效果较好. 

Application of Numerical Simulation and Analytical Methods to Estimate Hydraulic Parameters of Foundation Pit in Hydropower Stations

A hydropower station located on Dadu River of Sichuan Province is under construction now. The construction of its impervious walls have been completed basically, however, the discharge of water is still large in the foundation pit of hydropower station. In order to evaluate the performance of impervious walls, two pumping tests was conducted between the two impervious walls. According to the boundary conditions of this area, the comprehensive well function was used to obtain the hydrogeological parameters. On the basis, numerical model is established by using GMS (groundwater modeling system) software to obtain the aquifer parameters after identifying and verifying the model. The results indicate that the hydraulic conductivity of aquifer is between 19.13-32.24 m/d by analytical method, and 26.00 m/d by numerical simulation. In addition, the hydraulic conductivity of impervious walls is very small (0.01-0.02 m/d), it is found that the performance of impervious walls is good.