基坑开挖对邻近公路盾构隧道变形影响分析

摘要

盾构法公路隧道已成为拥有主干河流城市越江通道的主要手段之一.运营公路隧道周边基坑开挖将引起隧道的附加变形,从而影响隧道的正常安全运营.针对工程实例,采用有限元分析软件PLAXIS,分步进行基坑开挖过程对公路盾构隧道的影响分析,力求掌握在基坑开挖过程中,隧道的变形发展规律.并针对是否采取辅助加固保护措施进行分析论证,从而指导施工,确保临近公路隧道的安全.%Shield tunnel method is used wildly for road tunnel as the underwater passage in megacity.Deformation of road shield tunnel due to adjacent deep excavation is a big issue for safety of operation tunnel.This paper simulates a real project using PLAXIS.The numerical analysis focus on the deformation of tunnel due to excavation step by step.The aim of this analysis is to investigate the development of tunnel deformation.Furthermore,cases with different protection measures is compared.The results is very useful for the engineer to conduct the construction,making sure the safety of the road tunnel nearby the deep excavation.