三峡工程一期围堰施工技术综述

A summary of the construction technology in the first phrase cofferdam of the Three Gorges Project

三峡工程一期围堰全长２６４９ｍ，工程量大，工期紧。在施工中从技术角度选取了风险决策抢填试验段；优选石料料场并应用硐室爆破技术开采石料；改进围堰防渗结构和施工技术；优化改进围堰施工方案和细部结构，使一期土石围堰工程提前１０个月顺利建成。一期围堰经过３年运行和洪水考验，工程质量良好，为三峡工程大江截流创造了良好条件。

The first-phrase cofferdam of the Three Gorges Project is 2 649 m long,with a large project quantities and short construction period.In the construction,the test section is rush filled based on the risk decision and viewed from the technical point.In the construction,the test section is rush filled based on the risk decision and viewed from the technical point.The quarry site has been optimized and the chamber blasting technology has been adopted.The first-phrase cofferdam has stood the test of operation and flood for three years and has proved that the quality of the cofferdam is good,which creates a favorable condition for the river closure of the Three Gorges Project.