桥梁桩基础施工对既有明挖隧道变形影响研究

以某桥梁跨越隧道工程为研究背景,运用有限元软件模拟桥桩基础施工过程,并针对桩基础不同开挖深度对地铁隧道的影响展开对比分析,研究表明:在桥梁桩基础施工过程中,东西双向隧道拱底、隧道左、右拱腰以及桩基础周边土体变形规律均呈对称分布;靠近隧道附近施工对隧道拱底和拱腰的变形影响最大;桩基础开挖深度未超过隧道时,地表沉降与桩周土体水平位移均随着开挖深度的增大而变大,当开挖深度超过隧道位置后,地表沉降与桩周土体位移将不再受开挖深度的影响,其结论可为类似桥梁跨越隧道工程研究提供参考与借鉴。

Study on Influence of Bridge Pile Foundation Construction on Deformation of Existing Open Tunnels

Based on the research background of a bridge crossing tunnel project,the finite element software is used to simulate the construction process of bridge pile foundation,and the influence of different excavation depth of pile foundation on subway tunnel is compared and analyzed.the results show that in the construction process of bridge pile foundation,the deformation law of arch bottom of east-west two-way tunnel,left and right arch waist of tunnel and soil around pile foundation are symmetrical.The construction near the tunnel has the greatest influence on the deformation of the arch bottom and waist of the tunnel.When the excavation depth of the pile foundation does not exceed the tunnel,the surface settlement and the horizontal displacement of the soil around the pile increase with the increase of the excavation depth.When the excavation depth exceeds the tunnel position,the surface settlement.The displacement of the surrounding soil will no longer be affected by the excavation depth,and the conclusion can be used as a reference for the research of similar bridges crossing the tunnel.