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摘要：
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为研究盾构施工对桥梁桩基的影响,基于ANSYS软件,建立了盾构近距离穿越既有桥梁桩基的三维有限元模型。数值模拟结果表明,盾构施工会引起地层产生较为明显的位移,根据与隧道相对深度的不同,竖向位移可分为沉降与回弹;隧道周围土体有向隧道变形的趋势,使得桩体产生垂直于隧道的水平位移;开挖面支护压力对桩体平行于隧道方向的位移产生主导影响,施工中取稍大于静止土压力的支护压力是比较适合的。
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To study the influences of shield tunneling to neighboring piles,three dimensional finite element models is established based on ANSYS.It is revealed that shield tunneling can cause displacement of around strata.The vertical displacement can be classified into settlement or rebound according to the relative depth to the tunnel.The strata around the tunnel have a displacement tend toward the tunnel;it will cause the horizontal displacement of the piles,which is perpendicular to the tunnel.The pressure on the heading face contributes mainly to the displacement of pile along the tunneling direction.It is preferable to use the supporting pressure,which is little more than the static earth pressure during the construction.
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作者简介：
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参考文献：
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[1]徐永福,陈建山,傅德明.盾构掘进对周围土体力学性质的影响[J].岩石力学与工程学报,2003,22(7):1 174-1 179.
[2]张志勇.盾构施工对周围环境影响研究综述[J].现代隧道技术,2002,39(2):7-11.
[3]于宁,朱合华.盾构施工仿真及其相邻影响的数值分析[J].岩土力学,2004,24(2):292-296.
[4]朱合华,丁文其,李晓军.盾构隧道施工力学性态模拟及工程应用[J].土木工程学报,2000,33(3):98-103.
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