底流消能中溢流坝体型对消力池的影响

Effect of Overflow Dam's Bodily Forms on Stilling Basin in Energy Dissipation by Hydraulic Jump

结合某溢流坝水利工程,在采用底流消能,降低护坦高程形成消力池的情况下,通过基本的水力计算,分析比较了常规体型和优化体型溢流坝下游消力池的水力要素。计算结果表明,体型优化后的溢流坝,消力池的池深和池长都明显变小了,大大减小了坝体混凝土的用量以及消力池的开挖量,节省工程投资。在水工模型试验中,体型优化后的溢流坝消力池中水流流态良好,试验结果与计算结果吻合较好。

Here,by fundamental hydraulic computation and combining with a hydraulic engineering of overflow dam,the hydraulic elements of the downstream stilling basin among overflow dams with both general and optimized shape are analyzed and compared under the case of energy dissipation by hydraulic jump and forming the stilling basin by lowering the elevation of the apron.The computing results indicate that the length and depth of the stilling basin would decrease remarkably after optimizing the shape of the overflow dam,which would lead to save the engineering investment a lot by greatly reducing the the concrete dosage used in the dam body and the excavation volume of the stilling basin.The hydraulic model test shows that the flow regime in the optimized stilling basin is fine,and the experimental results could coincide with the computing results preferably.