三峡工程二期深水高土石围堰的科技攻关及其实践检验

三峡工程二期深水围堰水深60 m,堰高80 m,是三峡工程重大技术问题之一,用传统的斜墙铺盖方案不可靠,为此,1979年开始结合葛洲坝大江上游围堰设计施工中的成功经验进行科技攻关.三峡围堰方案将葛洲坝围堰所采用的堰体防渗墙方案作为攻关的主攻方向.经"七五"、"八五"攻关解决了主要的技术问题,其成果用于设计和施工.施工及运行结果证明,攻关提出方案和主要技术措施是成功的.

Key-technology Tackling on TGP 2nd Stage High Earth-Rock Cofferdam in Deep-water and Its Examination in Practice

The construction of second stage cofferdam with a height of 80 m in waterdepth 60 m is one of keyXtechnology problems of TGP. A new keytechnology tackling topic about deepwater cofferdam was started in 1979 in combination with the desigh and construction of upstream cofferdam of main channel of Gezhouba Project, where instead of traditional inclined blunket scheme, a vertical impervious cutoff wall inside the cofferdam scheme had been successfully used under water depth 20 m. Primary technology problems were detailedly resolved through the National Keytechnology R&D Program of China during"Seventh and Eighth FiveYear Plan Periods". The study results were adopted in TGP design. The smooth construction and safe operation over 4 years proved that the recommended scheme and main technology measures are successful.