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通过对现场典型地层的工程地质特征进行分析总结,探讨了采用内撑式倒挂壁的深基坑开挖支护工法对兰州市城市轨道交通工程深基坑开挖遇到地层的适用性。为了验证内撑式倒挂壁深基坑开挖支护工法的施工可行性,使用Slide滑坡计算软件对基坑边坡开挖支护前后进行了稳定性分析,并在计算结果的基础上对基坑进行试验性开挖、支护。结果表明:有内撑倒挂壁施工方法可以有效减小对工程赋存环境的不利影响,其结构体本身作为围护结构的支撑体系,刚度较高,可显著减小围护结构及周边环境的变形。内撑式倒挂壁的深基坑开挖支护工法能够保证深基坑的稳定性,可为兰州市城市轨道交通工程深基坑临时开挖作业设计提供参考。
By analyzing and summarizing the engineering geological characteristics of the typical formation in the field, the applicability of the deep foundation pit excavation and support method with the internal support type inverted wall to the formation encountered in deep foundation pit excavation of urban rail transit project in Lanzhou City was discussed. In order to verify the construction feasibility of the deep foundation pit excavation and digging support method of inverted inner wall, using the Slide landslide calculation software to analyze the stability before and after excavation and support of the foundation pit slope. Based on the calculation results, Pit for experimental excavation, support. The results show that the construction method with internal support upside down wall can effectively reduce the adverse impact on the engineering storage environment. The structure itself acts as a support system for the support structure with high rigidity, which can significantly reduce the envelope structure and the surrounding environment Deformation. The deep foundation pit excavation and support method with internal support inverted wall can guarantee the stability of deep foundation pit and provide reference for the temporary excavation operation design of deep foundation pit of Lanzhou urban rail transit project.