地下过街通道管井降水施工实例分析

Analysis of tube well dewatering construction in underpass

通过水文地质调查和现场降水试验,提出了适用于无隔水层而引起滞水存赋的强透水地层中开挖浅埋地下结构的“大管井群降,小管井辅助”的降水方案。分析了该方案在沈阳市文安路地下过街通道施工中的应用过程及其降水效果。研究结果表明,对于渗水系数较高的强透水圆砾地层,采用该方案可有效地解决高水位的问题,满足通道开挖支护无水作业的要求;除局部地表出现较大的沉降变形外,对周围建筑物未造成明显的影响。该方案可对类似浅埋地下结构的降水施工提供参考。

According to the hydrogeological survey and site dewatering test, the method of big tube well group coupling the adjuvant small tube well is put forward for the strong penetrating strata without aquiclude. The details of construction and its results using the new dewatering method in an underpass in Wenan Road of Shenyang City are analyzed. The results show that the high water level problem is effectively solved for gravel strata with high penetrative coefficient. It satisfies the requirements of the non - water environment construction during excavation of underpass. It indicated that there is little influence for the building around the construction site except for larger ground surface subsidence in local zone. This case history provides a reference for similar underground engineering projects with shallow cover.