南水北调东线八里湾泵站渗透稳定分析

Seepage Stability Analysis of Baliwan Pumping Station in the Eastern Route of South-to-North Water Transfer Project

为了解决八里湾泵站主泵房场区潜水和承压水复杂渗流问题,采用地下连续墙围封、排水孔、水平排水管、减压井等多种渗透稳定控制措施,延长渗径,增加上游水头损失,降低下游水位。与此同时,采用三维渗流数学模型法对地基渗流场进行求解,确定了地下连续墙的深度和排水孔、排水管、减压井间距,优化了渗流控制措施方案,成功解决了泵站的设计难题。研究结果可以为平原成层地层地区泵站工程的渗流和渗控设计提供参考。

In order to resolve the complex seepage problem of the unconfined and confined aquifers in the Baliwan pumping sta- tion, several seepage stability control measures, such as underground continuous wall, drainage holes, horizontal drainage pipes, and relief wells, were applied to extend the seepage path, increase upstream head loss, and decrease downstream water level. The seepage field of the ground foundation was obtained using the three-dimensional seepage mathematical model, and the depth of underground continuous wall and the spacing of drainage holes, horizontal drainage pipes, and relief wells were also determined, which can optimize the seepage control measures. Therefore, the design difficulty of pumping stations was solved. The research results can provide reference for the seepage control design of pumping stations in the layered strata area in the plains.