关键词: 水下检查, 泄洪消能建筑物, 淘刷, 原因分析, 处理建议

Abstract: Underwater inspection of a certain hydropower station revealed that the concrete of the second phase of the spillway gate slot, the concrete of the stilling pool, the foundation of the retaining tank and the downstream guide wall had suffered erosion damage. The reasons for the erosion of flood discharge and energy dissipation structures were analyzed from the perspectives of inflow conditions over the years, the hydraulic design of flood discharge and energy dissipation facilities, the construction quality of the stilling pool, and the opening and closing procedures of the gates. On this basis, engineering measures such as optimizing the shape of the energy dissipation pool and promptly repairing the damaged parts were proposed. In addition, management measures such as conducting flow state observation and recording during flood discharge, refining the gate opening and closing procedures, regularly carrying out underwater inspections, and promptly eliminating defects were proposed.

Key words: underwater inspection, flood discharge and energy dissipation structures, scour, causes analysis, treatment suggestions