锦屏一级水电站泄洪消能关键技术研究

Research on key technology of flood discharge and energy dissipation for Jinping Ⅰ Hydropower Station

锦屏一级水电站泄洪功率较大,泄洪消能问题十分突出,为此展开了大量物理模型试验。试验结果表明:通过宽尾墩和窄缝技术对表、深孔体型进行优化,可实现"表、深孔分层出流,空中无碰撞,水垫塘消能"的消能模式;同时,泄洪洞出口采用"燕尾坎"体型,可减轻出口挑流对边坡造成的破坏。原型观测的结果也证实,所采用的泄洪消能措施达到了满意的效果,且模型与原型成果之间存在着较好的相似性。

Due to the tremendous flood discharge power of Jinping I Hydropower Station, attention should be paid on the ener-gy dissipation in flood discharge process. To solve the problem, a series of physical model tests were carried out. The results show that when using flaring gate pier and narrow slit to optimize the shape of surface hole and deep hole, the energy dissipation mode of discharging separately from surface hole and deep hole without collision in air and power dissipation of water cushion can be realized. Furthermore, dovetail bucket of the flood discharge tunnel outlet significantly reduce the destructive effect of the jet flow on the slope stability. The prototype observation also confirmed that the energy dissipation effect of aforementioned measures is satisfactory. In addition, there is a good similarity between the results of model tests and prototype observations.