摘要
三峡一期土石围堰于１９９３年１０月２４日下河修建，１９９４年７月建成，一期基坑抽水成功。１９９４年７月３１日通过挡水前的阶段验收。围堰填筑材料主要为风化砂、石渣，采用冲击及冲击反循环钻机造孔灌注柔性材料防渗墙，上接土工合成材料防渗，堰基保留部分水下新淤沙，并采取了适当的防护措施。工程实践证明，设计合理、施工方便，实现了提前抽水，节省了投资，工程质量是好的。
The earth rockfill cofferdam for the first stage works of the Three Gorges Project was constructed in the river channel since Octorber 24, 1993 and completed in March 1994. The first stage foundation pit was successfully dewatered. The stage acceptance of the cofferdam was past on July 31, 1994 before its retaining. Embankment materials of the cofferdam are mainly weathered sand and stone ballast. The impervious wall was constructed by using a percussion and reverse percussion borer to make holes and by pouring flexible materials with compound geotextile placed above the wall for seepage control. Under the cofferdam foundation, part of new silt was reserved and some seepag prevention measures were taken.Engineering practice has proved that design of the cofferdam is reasonable and construction is feasible with good engineering quality. Dewatering of foundation pit was conducted ahead of schedule and the investment cost is considerably decreased.
出处
《人民长江》
北大核心
1994年第12期1-7,共7页
Yangtze River
关键词
土石围堰
三峡水利枢纽
设计
工程施工
Sanxia Multipurpose Project Earth-reckfill cofferdam Design
Con struction
