隧道施工侧穿立交桥桩基三维数值模拟研究

Three-dimensional Numerical Simulation Study of Tunnel Construction Through Pile Foundations of Overpasses

依托某盾构隧道侧穿立交桥工程,基于三维数值建模,模拟盾构隧道施工侧穿既有桥梁桩基的施工全过程,分析和明确了盾构掘进过程中对桥梁桩基位移的影响规律。研究表明:盾构隧道施工侧穿桥梁桩基的整个过程中,桥梁桩基最大的竖向位移出现在盾构隧道左、右线之间的桩基底部位置,桩基最大的水平位移出现在隧道外侧的桩基顶部,桥梁墩台的水平向位移最大值出现在隧道两侧的桩基上。

Based on a shield tunnel lateral overpass project and three-dimensional numerical modeling,this paper simulates the whole construction process of shield tunnel lateral penetrating of existing bridge pile foundation,and analyzes and defines the influence law of shield tunneling on the displacement of bridge pile foundation.The research shows that:in the whole process of shield tunnel construction through the bridge pile foundation,the maximum vertical displacement of bridge pile foundation appears in the bottom of the pile foundation between the left and right lines of shield tunnel,the maximum horizontal displacement of pile foundation appears in the tunnel lateral top,the maximum horizontal displacement of bridge pier appears in the tunnel on both sides of the pile foundation.