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采用三维有限元方法动态模拟了城市地下沿街浅埋隧道的施工过程,分析和探讨了在此过程中引起的地层应力、地面沉降、地表超前沉降和隧道围岩变形特征,并与实测值进行比较。研究结果表明:在掌子面向前推进时,拱顶沉降受其影响的墙后距离约为2.5B(B为隧道净宽);拱顶产生的最大沉降量随开挖面的推进在逐渐增大;有限元模拟结果与实测值相吻合,由于没有考虑地下水等因素的影响其小于实测值。其分析结果具有一定的理论和实际意义,为相似工程提供了借鉴和指导。
Three-dimensional finite element method was used to simulate the construction process of shallow underground tunnels in urban underground. The strata stress, surface subsidence, pre-subsidence and deformation of surrounding rock caused by this process were analyzed and discussed, and compared with the measured values . The results show that when the face moves forward, the distance behind the vault settlement is about 2.5B (B is the tunnel width). The maximum settlement of the vault is gradually increasing with the excavation face The result of FEM simulation is consistent with the measured value, which is less than the measured value due to the influence of groundwater and other factors. The results of the analysis have some theoretical and practical significance, which provide reference and guidance for similar projects.