黄登水电站导流洞围堰残埂对截流的影响

通过对黄登水电站截流模型试验的研究,分析了导流洞进出口围堰残埂对截流的影响。主要从上游水位变化、截流过程中的水力学参数变化及截流抛投材料变化3个方面进行分析研究。试验成果表明:进出口围堰残埂在一定程度上增加了截流难度,且进口围堰残埂对泄流能力的影响较大;随着泄流量的增加,残埂对导流洞泄流能力的影响逐渐降低。因此,应尽量将导流洞进口施工围堰拆除到设计高程。

Influences of Residual Cofferdam of Diversion Tunnel of Huangdeng Hydroproject on the River Closure

The influences of residual cofferdam at the inlet and outlet of diversion tunnel on the river closure were investigated through model test with Huangdeng hydropower station as a case study. The influences were analyzed in terms of upstream water-level fluctuation, hydraulic parameters variation during the river closure, and loss of dumped ripraps. The result indicates that the residual cofferdam of diversion tunnel increases the difficulty of river closure. The residual cofferdam at the inlet of the diversion tunnel has bigger influence on discharge capacity than that at the outlet. And the influence on the discharge capacity decreases when the discharge increases. It's concluded that the cofferdam at the inlet of diversion tunnel should be demolished to the design elevation as much as possible.  