关键词: 地下厂房, 排水孔幕, 渗流控制, 渗控优化

Abstract: Combining with the hydro geological conditions of the hydropower station and its layout, as well as the arrangement of seepage control system, three dimensional seepage field analysis is carried out, focusing on the performance assessment and optimization design of the seepage control system. Numerical results demonstrate that the seepage control system is properly designed and can effectively lower the phreatic surface in the surrounding rocks; the upper part of the drainage system has little effect on controlling the leakage from reservoir，therefore the space of drainage hole arrays on higher elevation can be enlarged; leakage channel exists in the existing seepage control system and can be further optimized.

Key words: underground powerhouse, drainage hole array, seepage control, seepage control system optimization