大渡河深溪沟水电站围堰设计  

Cofferdam design for Shenxigou hydropower station

作　　者：付峥[1] 

机构地区：[1]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《人民长江》2010年第18期36-39,43,共5页Yangtze River

摘　　要：由于深溪沟水电站导流洞进口地形狭窄,给导流洞进口施工围堰和大坝基坑的布置设计带来极大困难。结合施工场地、地形和地质条件,经比选,导游洞进口围堰采用在7 m高的岩埂上建14 m高的混凝土重力式围堰外加锚索加固的方案。大坝基坑上游围堰从保证工期和便于利用基坑岸坡开挖料考虑,将其设计为碾压式土工膜斜墙围堰,即完成防渗墙施工和堰体填筑后,再在上游迎水面铺设复合土工膜并与混凝土防渗墙连接,形成封闭防渗体系。围堰建成后,历经2 a的运行及"5.12"大地震的考验,安全稳定。The narrow terrain at diversion tunnel inlet bring difficulty for layout design of construction cofferdam and dam pit of Shenxigou hydropower station. In the combination of construction field, terrain and geological condition and through comparison, the cofferdam at inlet of diversion tunnel is designed as 7 m rock - mass wall ＋ 14 m concrete gravity cofferdam ＋ 2000 kN anchor cable reinforcing. By the consideration of construction schedule and utilization of excavated material from pit slope, the upstream cofferdam of dam pit is designed as rolled geomembrane declining cofferdam, i. e, after construction of seepage prevention wall and backfilling of dam body, geomembrane is laid and connected with concrete seepage prevention wall to form closed seepage prevention system. After 2 years operation and ＂5.12＂ earthquake trial, the cofferdam is still safe and stable.

关 键 词：围堰 深基坑 锚索 深溪沟水电站 

分 类 号：TV551.3[水利工程—水利水电工程]