基于MIDAS-GTS的某盾构隧道下穿高速公路路基段及桩基影响研究

Study on Influence of Subgrade and Pile Foundation of a Shield Tunnel under MIDAS-GTS

以某拟建城际铁路隧道下穿既有运营的高速路路基段及桥梁桩基工程为背景,采用MIDAS-GTS数值软件,考虑地质变化、施工阶段、道路及桥梁运营荷载、注浆加固及隔离措施等因素,模拟了盾构下穿路基及桥梁桩基的全过程,对路基沉降、路基顶面横向沉降槽形太变化、桥梁桩基位移及上部结构位移等进行了分析。

Taking the construction of a planned intercity railway tunnel underneath the existing expressway roadbed section and the bridge pile foundation engineering, MIDAS-GTS numerical software is used to consider geological changes, construction stages, road and bridge operation loads, and grouting.Reinforcement and isolation measures and other factors simulate the whole process of the tunnel tmderpass and the bridge pile foundation.The settlement of the roadbed, the variation of the transverse settlement of the roadbed top, the displacement of the bridge pile foundation and the displacement of the superstructure are analyzed.