Abstract: The underground powerhouse of pumped storage power station is deeply buried, and is affected by many factors such as drainage gallery, water filling of tunnel, complex geological conditions and natural groundwater, so the complex seepage field is often formed. Based on the FEFLOW software, a three-dimensional steady state model of seepage including water transmission tunnel, underground powerhouse, drainage gallery, surrounding rock and fault is established. According to the simulation results, the initial seepage control and drainage scheme is optimized, eliminating unnecessary drainage galleries in the middle horizontal section and lifting drainage galleries in the lower horizontal section to discharge seepage water in the form of natural flow. The total seepage flow of drainage galleries and cavern group in the powerhouse area is 8 048.16 m³ /d, which provides a greater flexibility for the selection of drainage pumps for underground powerhouse.

Key words: pumped storage power station, underground powerhouse, three-dimensional seepage field, seepage control and drainage scheme

摘要： 抽水蓄能电站地下厂房埋深较大，受排水廊道、隧洞充水、复杂地质条件、天然地下水等多种因素影响，常 形成复杂渗流场。基于FEFLOW软件建立包含输水隧洞、地下厂房、排水廊道、围岩、断层的三维渗流稳态模型，根 据模拟结果对初始防渗排水方案进行了优化，取消不必要的中平段排水廊道，并抬升下平段排水廊道，使其以自流 方式排出渗水。厂房区排水廊道和洞室群渗流量合计8 048.16 m3 /d，为地下厂房排水泵选型提供较大富余度。

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