关键词: 水下检查, 墨汁示踪法, 临时封堵, 点线结合, 塑性处理, 水下破损修复

Abstract: Large leakage was found at lower reservoir of Xilongchi power station since first storage in 2008. Long term operation of the reservoir under this condition would directly affect the comprehensive efficiency and economic benefits of the power station. More importantly, it would threaten the safety of the dam and the reservoir if the leakage problem couldn't be solved in a long time. Underwater leakage inspection based on ink tracer method and temporary plugging were done in 2012~2013, and main sources of leakage were identified. In 2014, underwater plastic treatment was taken at structural joints and cracks in inlet/outlet region and the face of lower reservoir. And underwater repairment was taken at damaged area. After treatment, the leakage was significantly reduced, and the safety hazard of lower reservoir was eliminated.

Key words: underwater inspection, ink tracer method, temporary plugging, combination of point and line, plastic treatment, underwater repairment