官帽舟水电站泄洪洞出口形式优化试验研究

Experimental Study on Optimum Floodway′s Bodily Form of Guanmaozhou Hydroelectric Station

运用官帽舟水利枢纽整体水工物理模型,对溢洪道、泄洪洞体形结构进行试验研究.针对原设计方案中水舌冲刷右岸边坡且冲刷深度较大的问题,提出了4种优化方案,通过试验成果比较后,选择方案Ⅳ为推荐方案对泄洪洞挑坎体形进行修正.通过调整挑流鼻坎边墙形状、出口宽度、挑坎角度以及增加差动墩的方法,优化了泄洪洞出口挑坎,使下泄水流更顺畅,消能更充分,满足下游两岸防冲要求.

The structures of the spillway and floodway are studied in hydraulic model test on a physical model of Guanmaozhou Hydroelectric Station. Consequently, the shape of the spillway designed in the original design is revised, so as to solve the problems that the bucket scour both the downstream right bank＇s slop and form some deep scouring pits four optimum schemes are pointed out,after comparing with the experimet＇s results,No. 4 scheme is recommended to ptimze the from of flip bucket. Optimum geometry of flip bucket is provided through modulating form of guide wall,width of outlet,angle of flip bucket and adopting chute block these can make flow smoother,eliminate energy and meet safeguard of lower reaches of a river.