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针对高架桥桩基础受邻近隧道建设影响的问题,建立了隧道及桩基的三维数值模型,从地表变形、桩身位移、桩的内力变化等方面研究了当隧道施工对桩基的影响。计算结果表明,盾构隧道施工对桩基的变形和内力将会带来影响。地表沉降大于桩的沉降,桩身水平位移受到的影响大于沉降。隧道施工将会导致桩侧一定范围内出现负摩阻力,但数值不大。总体而言,桩基的设计可以保证在隧道建设时的安全稳定性。文中的实例研究对于隧道等地下工程建设可以起到参考和借鉴作用。
Aiming at the problem that the viaduct pile foundation is affected by the adjacent tunnel construction, a three-dimensional numerical model of tunnel and pile foundation is established. The influence of tunnel construction on the pile foundation is studied from the aspects of surface deformation, displacement of pile body and internal force of pile. The calculation results show that the construction of shield tunnel will affect the deformation and internal force of pile foundation. Surface subsidence is greater than the pile settlement, pile horizontal displacement is greater than the settlement. Tunnel construction will lead to negative friction within a certain range of pile side, but the value is not large. In general, the design of pile foundation can ensure the safety and stability of tunnel construction. The case study in this paper can be used as a reference for the construction of tunnels and other underground projects.