百龙滩水电站一期导流工程堆石围堰快速施工

The Quickening Construction of the First-stage Rockfill Cofferdam of the Bailongtan Hydropower Station

关键词:  堆石围堰  土工膜  快速施工

Key words:  Rockfill cofferdam  geomembrance filter  quickening construction

摘要:

认为将原设计的砂壤土心墙不过水土石围堰改为不过水的堆石体复合土工膜围堰是围堰按期完成的关键决策。将传统的先岸坡后河床、自上而下逐层开挖方案改为先挖河道中的岩层部分,再根据围堰施工进度,挖船闸岸被覆盖土方用于土堤填筑,石方开挖从坝轴线附近拉槽创造工作面的方法解决了临建工程与主体工程同时进行的石料的来源。根据工程情况因地制宜、优化施工组织设计和措施方案,加强现场管理的经验值得推广应用。

Abstract:

The first-stage rockfill cofferdam of Bailongtan hydropower station can be achieved on time, the most important decision is to replace the rockfill clayer core cofferdam with rockfill cofferdam with geomembrance filter. In construction, the traditional excavation method of "first bank then bottom, from up to down, layer by layer" has been innovated. First, rock in the bottom was excavated, along with the construction progress, clayer covering layer of the navagation was quarried for earthfill. The experiences of construction, optimal design and strengthening the construction management are successful and are worth to be extended.