一次真刀真枪的考试  

A severe test for the safety of a cofferdam in Three Gorges Project during large flood season in 1998

作　　者：包承纲[1] BAO Cheng-gang(Yangtze River Scientific Research Institute,Wuhan 430010,Hubei,China)

机构地区：[1]长江科学院,湖北武汉430010

出　　处：《地基处理》2022年第2期178-180,共3页Journal of Ground Improvement

摘　　要：三峡工程在其建设过程中曾经历过各种问题和困难,极具挑战性的二期围堰也不例外。二期围堰是保证三峡二期工程安全施工的重要屏障,其安危关系工程全局。在建设过程中,1998年汛期曾多次遭遇特大洪水的突然袭击,它的防渗墙产生了过大的水平变形,其安危堪虞。工程面临停止基坑抽水、撤退人员,或者继续施工的抉择。经过有关研究人员紧张而有效的分析计算和综合研究,认定:当时围堰尚处于安全状态,建议加快施工,尽早摆脱当时不利的工作条件。从而使工程得以继续施工。并在当年挡住了8次大洪水的袭击。二期围堰工作了5年,经受住了多次大洪水冲击的严峻考验,实测漏水量极小(设计值的1/10)。围堰无疑是成功的,有关人员也经历了一次真刀真枪的“考试”。The Three Gorges Project experienced various challenges during the construction process. Its second stage cofferdam is an important barrier to ensure the safety of the second stage construction. During the flood season in 1998,the second stage cofferdam has been suddenly attacked by severe floods for many times, resulting in excessive horizontal deformation of the cut-off wall, which exceeded the expected range. At that time, the cofferdam was just under construction. Its safety was a major concern for everyone at the site. The project was faced with the choice of stopping the pumping of the foundation pit and withdrawing personnel or continuing construction. After intense and effective analysis, calculation and comprehensive research by relevant researchers, it was determined that the cofferdam was still in a safe state. Therefore, it was suggested to speed up the construction progress to get rid of the adverse working conditions as soon as possible. Therefore, the project was able to continue with the operations. And the constructed cofferdam successfully restrained 8 of the major flood paths in that year. The second cofferdam has been in operation for 5 years and has withstood the severe test of many major floods. The measured water leakage of the whole cofferdam was extremely small, only 1/10 of the design value. That was a real severe test for us. From this, it is learned that the analysis work of a structure should be carried out during the whole construction period.

关 键 词：水平变形 漏水量 二期围堰 三峡工程 特大洪水 问题和困难 三峡二期工程 基坑抽水 

分 类 号：TU74[建筑科学—建筑技术科学]