盾构隧道施工对邻近立交桥桩基位移及应力影响分析

以某隧道工程下穿高架桥为研究对象，分析了隧道开挖对邻近桥梁桩基的位移、剪力和弯矩等的影响规律。结果表明:隧道开挖对桩基的横向位移和纵向位移影响较小，最大横、纵向位移均小于规范规定的4 mm；桩基离盾构开挖面越远，受到的影响越小；隧道掘进过程中对桩体的轴力、剪力和弯矩影响较大，因此，在隧道施工过程中应对邻近桩体采取一定的加固措施以保证施工顺利推进。

Influence Analysis of Shield Tunnel Construction on Pile Foundation Displacement and Stress of Adjacent Flyover

Taking a viaduct underpass in the tunnel project as a research object, this paper mainly analyzes the law of influence of tunnel excavation on the displacement, shear force and bending moment of adjacent bridge pile foundation. The result shows that the influence of tunnel excavation on lateral and longitudinal displacement of pile foundation is small since the maximum horizontal and longitudinal displacement is less than the regulated 4 mmdisplacement. The farther the pile foundation is from the excavation face of shield, the less the influence is. In the process of tunneling, the axial force, shear force and bending moment of the pile body will be greatly influenced. Therefore, some strengthening measures should be taken to ensure the smooth progress of the tunnel construction.