杨房沟水电站泄洪消能设计

杨房沟水电站坝址河谷狭窄,洪峰流量大,枢纽最大泄洪功率为10 960 MW,在国内拱坝中处于较高水平.水电站泄洪消能采用“坝身表、中孔泄洪+坝下水垫塘”布置型式.文中通过方案比较,泄洪建筑物采用3个表孔和4个中孔的坝身集中泄洪方案,下游消能建筑物采用水垫塘+二道坝方案.表孔出口采用收缩型式、中孔出口采用收缩型式的宽尾墩.结合泄洪雾化分析,对水垫塘两岸边坡采用混凝土护坡、喷锚支护和排水孔等措施.

Design of flood discharge and energy dissipation for Yangfanggou hydropower station

Because of the narrow valley and large peak discharge,the maximum flood discharge power of Yangfanggou hydropower station is 10960MW,which has the high level in the arch dam in China.The layout type of crest overflowing and mid-discharge orifices through dam and the plunge pool below dam is used for the flood discharge and energy dissipation of hydropower station.Through the schemes selection,the flood discharge structure adopts the concentration flood discharge scheme with three crest overflowing and four mid-discharge orifices in the dam and the energy dissipation structure adopts the plunge pool and subsidiary dam scheme.To reduce the influence of flood discharge atomization on the high slope both banks,the layout type of less collision in air are adopted for crest overflowing and mid-discharge orifices,namely the crest overflowing orifice adopts the contraction type and the mid-discharge orifice adopts the flaring gate piers with contraction type.Combining with the analysis of flood discharge atomization,these measures of concrete slope protection,shotcrete and rock bolt support and drainage holes are adopted for the both bank slopes of the plunge pool.