盾构下穿合肥高铁南站对路基的影响分析

Study on the Effect of Shield Tunnel Down-traversing Hefei South Railway Station on the Ground

本文以合肥市轨道交通1号、5号线下穿合肥高铁南站为依托,采用MIDAS/GTS有限元软件对盾构隧道施工过程模拟,分析了桩基群上部铁路路基沉降变化。通过模拟可知,既有桩基群能有效控制盾构施工过程中路基的沉降。先开挖的隧道引起的高铁路基沉降值大于后开挖的隧道引起的高铁路基沉降值,且在全线贯通时先开挖隧道引起的路基沉降与后开挖隧道引起的沉降产生明显的叠加。

Based on Hefei subway No.1 and No.5 rail transits traversing beneath the subgrade of the high-speed south station , the numerical model of MIDAS/GTS was established to analyze the changes of subgrade settlement above the crowd stakes during the process of construction of shield tunnel . The existing crowd stakes can effectively control the subgrade settlement during the process of construction of shield tunnel by simulating, and high-speed railway subgrade settlement caused by the excavated tunnel ifrstly exceeded that of the later , and obvious superposition of subgrade settlement induced by ifrstly and later excavated shield tunnel can be seen when the whole line transifxed .