地铁盾构隧道施工引起的地表变形特征研究

Characteristic Study on Surface Deformation Caused by the Construction of Subway Shield Tunnel

结合郑州地铁1号线西三环站至秦岭路站地铁区间隧道盾构施工的实际,通过现场监测和数值模拟计算对盾构隧道施工引起的地表变形特征进行了研究。主要研究了地表横向变形和纵向变形规律,从而确定了盾构隧道掘进对横向变形的影响范围,并结合郑州区域性粉土地层的特点,运用有限差分软件FLAC3D建立了地铁盾构施工的三维有限差分模型,对盾构施工引起地表变形发展过程进行了数值模拟计算,从而得出了一些有意义的结论。该研究对确保地铁隧道施工的安全具有重要的意义。

Combined with the shield tunnel construction of Zhengzhou Metro Line No. 1, between Xisan- huan Station and Qinling Road Station, this paper conducts the research on the characteristics of surface deformation caused by the shield tunnel construction through site monitoring and numerical simulation. By studying the horizontal and vertical deformation rules of the surface, the paper ascertains the impact range of the construction on the vertical deformation. According to the regional characteristics of silt layer in Zhengzhou,the paper establishes the three dimensional finite difference model of the metro shield construc- tion by using finite difference software FLAC3D, simulates the surface deformation caused by the shield tunnel construction process and obtains some significative conclusions.