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将北京市轨道交通八号线二期南段盾构隧道施工作为背景,基于工况的典型性分析,首先,利用盾构机作业面的现场监测,获得了盾构隧道作业振源的时程曲线并就其频幅特性进行了分析研究;其次,对盾构施工所引起的地表土体的振动情况进行了现场监测分析。在此基础上,利用Z-soil大型有限元分析软件,考虑隧道结构与周围土层的动力相互作用,以实测振源时程作为荷载输入,建立了地铁盾构隧道施工引起周围地表振动响应的三维数值分析模型,结合现场测试成果,分析了地铁隧道盾构施工引起的地表(纵向的和横向的)振动响应规律。上述工作可为类似工况下地铁盾构隧道施工引起周围环境振动响应的评估分析提供可靠借鉴,从而使得地铁项目的设计与施工更为合理。
Based on the typical analysis of working conditions, based on the background of shield tunneling on the working face of shield tunneling machine, the time history of vibration source of shield tunnel is obtained. Curve and its frequency characteristics were analyzed and studied. Secondly, the on-site monitoring and analysis of the vibration of surface soil caused by shield construction was carried out. Based on this, using Z-soil large-scale finite element analysis software, considering the dynamic interaction between the tunnel structure and the surrounding soil, the time-course of the vibration source is taken as the input of load to establish the vibration response of the surrounding shield caused by the construction of subway shield tunnel Three-dimensional numerical analysis model, combined with field test results, analysis of the subway tunnel shield construction caused by the surface (vertical and horizontal) vibration response. The above work can provide a reliable reference for the assessment and analysis of the vibration response of the surrounding shield tunnel construction in similar conditions, which makes the design and construction of the subway project more reasonable.