盾构隧道下穿漫水桥对其桥梁结构变形影响分析

Analysis on Influence of Shield Tunneling Down-crossing Submersible Bridge on Its Bridge Structure

摘要:

以南水北调某支线工程盾构隧道下穿某漫水桥为工程实例，采取有限元数值模拟方法对盾构隧道下穿漫水桥施工全过程进行模拟，并通过计算分析提出了桥梁变形控制指标，结果表明盾构隧道下穿漫水桥施工对桥梁桩基产生了不同程度的沉降，但是桥梁各项变形均小于控制指标，能够保证盾构隧道施工安全穿越漫水桥。

Abstract:

Taking the shield tunneling down-crossing a submersible bridge in a branch project of the South-to-North Water Diversion Project as an engineering example, the finite element numerical simulation method is adopted to simulate the entire construction process of the shield tunneling down-crossing the submersible bridge. Through calculation and analysis, the deformation control indicators of the bridge are proposed. The results show that the construction of the shield tunneling down-crossing the submersible bridge causes varying degrees of settlement in the bridge pile foundation. However, each deformation of the bridge is all smaller than the control indicators, which can ensure the safe passage of shield tunnels through submersible bridges during construction.