小石口水库坝肩式溢洪道的设计优化

Design optimization of abutment spillway for Xiaoshikou Reservoir

为了解决溢洪道开挖量大、工程造价高、结构变形复杂、出口消能工对下游地基条件要求高等难题,小石口水库混凝土面板堆石坝采用了坝肩式溢洪道。与传统布置模式相比,坝肩式溢洪道具有枢纽结构布置紧凑,工程规模小、造价低等优点。与在堆石体上直接设置溢洪道相比,坝肩式溢洪道地基稳定可靠,可以避免复杂的结构变形问题,并允许通过较大的单宽流量。因此,在地形和岩石条件许可的情况下,坝肩式溢洪道布置型式值得推广。

An abutment spillway is adopted for the concrete face rockfill dam of Xiaoshikou Reservoir,so as to solve the problems such as large excavation amount,high construction cost,complicated structural deformation,high requirement of the downstream foundation on the outlet dissipater,etc.Compared with the conventional layout mode,the abutment spillway has the merits of compacted layout for the project structures,small construction scale,lower construction cost,etc.Compared with the layout that the spillway is directly arranged on the rockfill body,the foundation of the abutment spillway is stable and reliable and can avoid the problem from the complicated deformation,while larger discharge of per unit width is permissible to pass through as well.Therefore,the abutment spillway is valuable to be popularized and adopted,if the in situ topographic and geological conditions are permissible.