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根据极软岩中大断面暗挖地铁车站施工需要,研究了低渗透性地层中的群井降水施工技术特点,提出了和第三系半成岩地层相适应的降水井井管结构、成井工艺及井位布置原则等。采用了数值模拟、实践验证及反演计算等技术路线,成功解决了低渗透性、大降深群井降水方案设计及降水施工引起的构筑物保护难题等。经实践检验,降水效果显著,极大地降低了工程风险,取得了良好的社会经济效益。
According to the requirement of metro station construction in extremely soft rock mass excavation, the characteristics of well grouping dewatering in low permeability strata are studied, and the well structure of well, Well layout principles. Adopting such technical routes as numerical simulation, practical verification and inversion calculation, it has successfully solved the problems of low permeability, large drop well group precipitation design and the protection of structures caused by precipitation. After practice test, the effect of precipitation is significant, greatly reducing the project risk and achieving good social and economic benefits.