深大基坑群施工对邻近城轨车站安全影响研究

Research on safety impact of deep and large foundation pit construction on adjacent urban rail transit stations

文章依托某城轨车站周边深大基坑群建设,采用有限元软件进行三维仿真计算分析,研究基坑群不同的施工时序对邻近城轨车站主体及附属结构安全影响,在施工结束后将数值计算结果与现场监测数据进行对比印证。研究结果表明:单个基坑对周边环境的影响与其开挖深度有关,基坑深度越大,影响范围越广。当城轨结构处于不同基坑的影响叠加范围内时,无论同步或错开施工,基坑群施工均会产生一定的扰动叠加效应,反之,则基本只受邻近单基坑的施工影响。基坑群施工引起邻近城轨结构的竖向位移以隆起为主,侧向位移朝向基坑侧。通过分析研究可为后续类似工程设计和施工提供借鉴和指导。

This article studies the safety impact of different construction sequences of the foundation pits group on the main and auxiliary structures of the adjacent urban rail stations,by using finite element software to conduct three-dimensional simulation calculation and analysis in a construction project with deep and large foundation pits group around a certain urban rail station.After the construction is completed,the numerical calculation results are compared and confirmed with on-site monitoring data.The research results indicate that the impact of a single foundation pit on the surrounding environment is related to its excavation depth,the deeper the foundation pit,the severer the impact range.When the urban rail structure is within the impact synergistic area of different foundation pits,regardless of synchronous or staggered construction,the construction of the foundation pits group will produce a certain disturbance synergistic effect.Conversely,it is basically only affected by the construction of adjacent single foundation pits.The vertical displacement of the adjacent urban rail structure caused by the construction of the foundation pits group is mainly uplift,and the lateral displacement is towards the side of the foundation pits.Through analysis and research,it can provide guidance for the design and construction of similar projects in the future.