Abstract: As the world's largest hydraulic tunnel group, diversion tunnels in JinpingⅡhydropower station are deep-buried, long and large. The engineering geological condition is very complex. This paper focuses on the analysis of surrounding rock deformation, stress and strain of the retaining structure, changes of osmotic pressure and leakage during the filling and drainage experiment and initial operation of 4 diversion tunnels. The results proved the reasonable design of 4 diversion tunnels and the cross channel plugging body, good construction quality, favorable operation condition and the normal safety status.

Key words: diversion tunnel, initial operation, safety evaluation

摘要： 锦屏二级水电站引水隧洞工程地质条件极其复杂，埋深大、洞线长、洞径大，为世界上规模最大的水工隧洞洞室群工程。重点分析了4条引水隧洞充排水试验和运行初期的围岩变形、支护结构的应力应变、围岩渗透压力及渗漏量的变化情况。结果表明，4条引水隧洞和各横通道封堵体设计合理，施工质量优良，运行状况良好，工程安全正常。

关键词: 引水隧洞, 运行初期, 安全评价