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本文就辽宁省关门山水库双曲拱坝坝身泄洪的消能型式进行了初步探讨。关门山水库双曲拱坝坝高58.1m,坝顶拱圈长约200m。考虑采用坝身泄洪方案时,曾对六种泄洪消能型式进行了分析和比较,最后认为跌戽挑流消能是一种较理想的型式,它的特点是:设3个10m×3.9m的泄洪表孔,溢流堰顶高程为370.0m;在溢流堰末端用混凝土戽斗承接水舌;戽斗内加设分流墩,两墩间形成窄缝,水流分流后水舌逐渐壅高,在墩后形成三部分互相碰撞和分散的水流挑向下游;由于充分利用水流在空中的互相碰撞掺气而消杀能量,故减小了对河床的冲刷,对拱座安全有利;且因冲坑较浅,并远离坝址,可保证坝体安全。这种消能型式,施工简便易行,且不需设置二道堰,可减少混凝土工程量。
In this paper, the energy dissipation patterns of dam body flood discharge in Guanmen reservoir of Liaoning Province were discussed. Guanmen reservoir double curvature arch dam 58.1m, dam arch ring about 200m. In considering the dam flood discharge scheme, the six types of flood discharge and energy dissipation models were analyzed and compared. Finally, it is considered that the type of flood discharge and energy dissipation is an ideal type. Its characteristics are as follows: three 10m × 3.9m Of the overflow table, overflow weir top elevation of 370.0m; at the end of the overflow weir with concrete bucket to undertake the water tongue; 戽 bucket to add diversion pier, the formation of two narrow gap between the pier, water diversion tongue gradually 壅 high in the After the pier formed three parts collide with each other and the diversion of water pick downstream; due to make full use of water flow in the air collide with each other and kill energy, it reduces the erosion of the riverbed, the safety of the arch; Shallow, and away from the dam site, to ensure the safety of the dam. This type of energy dissipation, construction is simple and easy, and do not need to set up two weir, can reduce the amount of concrete works.