关键词: 超长水工隧洞;充排水设计;透水衬砌;复杂地质条件;高水头;N-J水电站;

Abstract: At present, there is no mature standard flow or specification for the filling-drainage of super long hydraulic tunnel with high head permeable lining under complex geological conditions, and there are few cases for reference.It is necessary to analyze and summarize the corresponding technical achievements.Taking the Neelum-Jhelum Hydropower Station in Pakistan as an example, this paper analyzes and summarizes the implementation plan, construction organization, problems and process data for water filling-drainage of diversion tunnel and tailrace tunnel, and then forms a relatively complete technical achievement in the purpose, work content, process control principle, implementation plan, risk prevention and control points, matters needing attention of the tunnel filling and drainage work, which is of great significance for similar projects.

Key words: super-long hydraulic tunnel; water filling-drainage; permeable lining; complex geologcial condition; high water head; Neelum-Jhelum Hydropower Station;