摘要
南水北调干渠施工中多经地下水位较高地段,常用降水井方法进行降排水施工。但部分渠段为多层地质结构,强弱透水层相间,上部的强透水层中部分地下水无法通过降水井疏干,不能满足施工要求。在采用降水井后开挖到含水层时,可利用降水井与明沟排水相结合的方法,快速疏干降水井无法疏干的地下水,有效解决原施工方案存在的问题,可保障施工的进度和安全。
In the construction of the South-North Water Transfer Project, trunk canals often passes areas with high groundwater level. Dewatering well is generally adopted for dewatering and drainage construction. However the underlying ground for some of the canal segments has a muhilayer geological structure, where aquitard was found between permeable layers. When the excavation depth nearly reaches the bottom of aquitard, some of the groundwater in the upper permeable layer cannot be dewatered through dewatering well and the site situation cannot meet the construction requirements. A new method was proposed, which used the dewatering well until the exeation reaches the aquitard. After that, dewatering well and ditch drainage were used in combination to rapidly drain the groundwater in the aquitard which cannot be drained by using dewatering well only. This method can effectively solve the problem in the original construction program and guarantee the construction progress and security.
出处
《施工技术》
CAS
北大核心
2012年第10期34-36,58,共4页
Construction Technology
基金
国家杰出青年科学基金资助(50925932)
关键词
地下工程
南水北调
基坑
降排水
降水井
underground
South-North Water Transfer Project
foundation excavation
dewatering anddrainage
dewatering well
