汾河二库泄洪工程布置的试验研究

Experiment Study on Layout of Flood-discharging Works,Fenhe Reservoir Ⅱ

汾河二库是一座大型的狭谷型水库 ,库容 1 33亿 ,泄洪工程主要是布置于坝体的四个底孔和坝面溢流段。为研究泄洪工程的合理布置方案 ,进行整体水工模型试验。主要内容为 :1)四个泄洪底孔布置于溢流堰右侧的原方案泄洪时存在的主要问题是坝后水流极不均匀 ,左侧回流范围宽约 70m ,长达 2 5 0m ,边岸流速局部可达 6m/s以上 ,超过岩石的抗冲流速。坝脚、边岸、变电站及防洪堤首部等处形成严重冲刷 ;2 )试验表明原布置方案如改变原设计运行方式后 ,即尽量减少泄流底孔开启孔数 ,把溢流堰的泄洪能力参与到泄洪中 ,也能在某种程度上使坝后流态有所改善 ;3)通过布置方案的优化比较 ,将泄洪底孔对称布置于溢流堰两侧的修改方案 ,使坝后流态彻底改善 ,冲坑基本均匀 ,冲坑最深点抬高了 5～

An integral hydraulic model test was done in order to determine the rational layout scheme of the flood-discharging works,Fenhe Reservoir Ⅱ.Firstly,the existing problems of the origin design scheme was found out,the test of changing the operation way of the origin design scheme was then done to improve the flow pattern after the dam,finally,the layout scheme was modified.