乐滩水电站船闸及冲砂闸工程二期围堰充水设计及运行

Water Filling Design and Operation of 2nd Phase Cofferdams of Ship Lock and Sand Sluice at Letan Hydropower Station

乐滩水电站船闸及冲砂闸围堰是低水头围堰,枯水期挡水,汛期超标洪水来到前,提前从围堰预留充水段向闸室充水进行内外压力平衡,从而保证了围堰保留段在超标洪水冲刷下,损坏较小,有利于下一枯水期快速修复,重新挡水。笔者有幸参加了该工程的施工,获得的技术经验值得同类工程借鉴。

Cofferdams with low water head are built for ship lock and sand sluice of Letan Hydropower Station to retain water during low water period.Before an over-standard flood comes in flood season,water filling section is reserved on the cofferdam,and the lock chamber is filled with water to balance internal and outside pressure.In this way,the rest section of the cofferdam is damaged less by the flood,and can be rapidly reconstructed to retain water in the next low water period.