地铁隧道侧穿施工对近邻高铁桥影响的数值分析

为研究地铁盾构区间侧穿高速铁路大桥对桥桩及周围地层的影响,以下穿郑西高铁大桥的地铁区间隧道工程为背景,对侧穿郑西高铁跨绕城高速大桥段区间隧道进行设计,并用FLAC3D数值计算软件对隧道下穿郑西高铁跨绕城高速大桥进行有限元数值仿真计算分析,揭示了地铁盾构侧穿作业施工过程对高速铁路上跨绕城公路特大桥基础影响的规律;研究了同一承台处桩基变形趋势特征;分析了左右线盾构区间中间桥桩位移变形规律;总结了盾构区间顶部以上以及盾构区间洞内及底部以下2倍洞径范围内桥桩水平位移及竖向沉降特征;研究了土体应力平衡状态变化情况.

Numerical Analysis of Influence of Subway Tunnel Side-crossing Construction on Adjacent High-speed Railway Bridge

In order to study the influence of high-speed railway bridge passing through the side of metro shield section on the pile and surrounding strata, taking the subway tunnel project passing through the Zhengzhou-Xi''an high-speed railway bridge as study object,the section tunnel of the side crossing Zhengzhou-Xi''an high-speed railway is designed, and FLAC3D numerical calculation software is used to carry out the finite element numerical simulation analysis of the side crossing Zhengzhou-Xi''an high-speed railway bridge, the influence law of metro shield tunneling on the foundation of the super-large bridge over the city-round highway on the high-speed railway is revealed the horizontal displacement and vertical settlement characteristics of the bridge pile above the top of the shield section and within the tunnel with 2 times the diameter below the bottom of the shield section are summarized the change of stress equilibrium state of soil mass is studied.