高海拔峡谷区复合型围堰一体化控制技术研究与实践OA

In response to the complex geological and hydrological conditions faced by the cofferdam construction of a hydropower station in a high-altitude canyon area,such as strong terrain constraints,poor rock stability,high flood risk,and difficulty in anti-seepage,a composite cofferdam"dynamic design zone segmented construction intelligent monitoring"integrated technology system has been developed and applied.At the dynamic design level,based on geological survey data and construction feedback,the"reserved rock embankment+soil and rock/concrete/CSG"composite structure and anti-seepage scheme have been optimized to ensure water retention safety for a 20-year flood(design flow rate of 5 560 m3/s).At the construction level,it is implemented in sections and zones according to the location and time period,and innovative technologies such as controllable anti-seepage grouting,high-pressure rotary jet anti-seepage walls,and gabion slope protection are applied to solve the construction problems of narrow working faces.At the monitoring level,a multi parameter intelligent monitoring system is constructed to provide real-time warning of seepage and deformation risks.Engineering practice has shown that this integrated technology can achieve anti sliding stability coefficients of 1.14-1.77(normal conditions)and 1.10-1.48(earthquake conditions)for cofferdams,and the anti-seepage performance meets the standard of≤10 Lu,achieving construction goals such as safety,efficiency,and environmental protection.