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苏州某地铁站为地下两层双岛四线平行换乘车站,车站南北两端分别接两段明挖区间,线路总长763.2m。由于车站长度范围广,纵向上地层分布呈现出差异性,承压水层的分布及埋深也不同,导致三个基坑在对承压水问题处理上的不同。综合基坑深度、周边环境及承压水层的不同分布,在保证基坑及周边环境安全的条件下,分别采用了地下连续墙完全隔断承压水层及降低承压水水头高度的方案。
A subway station in Suzhou is a two-lane, two-lane, four-lane parallel transfer station on both sides of the basement. The two ends of the station are respectively connected with two sections of light excavation at the north and south ends of the station. The total length of the line is 763.2m. Due to the wide range of station length, stratigraphic distribution in the vertical shows a difference, and the distribution and depth of confined aquifers are also different, resulting in the different treatment of confined water in the three foundation pit. Based on the different depth of the foundation pit, the surrounding environment and the different distribution of the confined water layer, under the conditions of ensuring the safety of the foundation pit and the surrounding environment, the underground continuous wall is used to completely cut off the confined water layer and reduce the head height of the confined water.