滩坑水电站施工导流与度汛

滩坑水电站施工导流过水围堰流量大；流速快。围堰防渗墙施工不留龙口，采用先闭气后截流的施工方案，实现深基坑开挖快速施工。汛期适当提高坝体填筑高程；在坝面高差处设置超径石保护，经多次过流后坝面冲刷较少，为今后面板坝汛期填筑积累了经验。

Construction Divevsion and Flood Season for Tankeng Hydropower Station

The construction diversion of the Tankeng Hydropower Station has the characteristics of big discharge and quick flow speed on its overflow cofferdam. The cutoff wall of cofferdam was constructed without river-close mouth. The construction measures of air closure first and then river closure are adopted to realize the quick excavation of deep foundation pit. The crest elevation of the main part of dam filling enhanced properly during flood season period and the protect measures that using excess diameter stones at where relative superiority of surfaee of dam.The surface of dam was less eroded after flowing over the cofferdam many times All these measures provide experience for construetion of facing dam in the future.