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根据苏州市临顿路地铁车站深基坑开挖的地质与周边的复杂情况,分析了基坑开挖施工中必须解决的地下水、流砂和管涌,特别是边坡稳定与变形控制问题。确定了可最大程度降低结构失稳几率的竖向分层、水平分段的基坑开挖方法与顺序,提出了地下连续墙、深层搅拌桩、钻孔灌注桩以及基坑地基加固方案多结构形式联合围护的施工方法。实践表明,研究出的地铁车站基坑开挖顺序及与其相适应的联合围护结构方案,可确保基坑本身的边坡稳定,并能保证极近距离范围建筑的结构安全。
According to the geological conditions and the surrounding complex of the deep foundation pit excavation at LinTong Road metro station in Suzhou City, the problems of groundwater, sand flow and piping, especially slope stability and deformation control, which must be solved in the excavation of foundation pit are analyzed. The vertical stratification and horizontal section excavation method and sequence are determined to minimize the probability of structural instability, and the multi-structure of underground continuous wall, deep mixing pile, bored pile and foundation pit reinforcement scheme are proposed Construction of the form of joint enclosure. The practice shows that the excavation sequence of the foundation pit of subway station and the scheme of the joint envelope that is suitable for it can ensure the slope stability of the foundation pit itself and ensure the structural safety of the building in the very close range.