关键词: 水下建筑物, 基础淘刷, 水下不分散混凝土, 吨袋, 预制板

Abstract: Scouring of foundation of underwater structures in the downstream energy dissipation area of a hydropower station is common. Combined with Zilanba hydropower project, based on analysis of cause reasons for scouring, the rehabilitation scheme is put forward. By pouring of underwater non-dispersing concrete, the cavity caused by scouring in foundation is eliminated. As well, the remaining downstream cofferdam core wall and the deposit of sand and gravel are removed to improve the flow pattern. The treatment scheme is effective which eliminated the risks caused by foundation scouring.

Key words: underwater structures, foundation scouring, underwater non-dispersing concrete, ton bag, precast slab