高速公路桥墩桩基施工对既有隧道力学行为研究及稳定性分析

新建桥梁上跨既有隧道,会使隧道产生一定安全隐患,因此需要在桩基施工及桥梁运营中对既有隧道的安全性进行分析评估。以某新建高速公路桥梁上跨南昆客专隧道为研究对象,采用有限元软件对桥梁桩基、隧道围岩进行模拟,分析新建工程影响下的隧道围岩位移及力学性能。结果表明,桩基施工及成桥运营引起的隧道位移非常微小,对既有隧道基本没有影响。

The new bridge spans the existing tunnel, which will cause some hidden dangers to the tunnel, so it is necessary to analyze and evaluate the safety of the existing tunnel in the pile foundation construction and bridge operation. Taking the Nanning-Kunming special tunnel on a newly-built highway bridge as the research object, the pile foundation of the bridge and the surrounding rock of the tunnel are simulated by finite element software, and the displacement and mechanical properties of the surrounding rock of the tunnel under the influence of the new project are analyzed. The results show that the tunnel displacement caused by pile foundation construction and completed bridge operation is very small and has no effect on the existing tunnel.