宁波地铁盾构隧道上方基坑开挖影响案例分析  

Case Analysis of the Influence of Foundation Pit Excavating on Shield Tunnel of Ningbo Metro

作　　者：姚燕明[1] 杨金刚 王哲 

机构地区：[1]宁波市轨道交通工程建设指挥部,宁波315000 [2]中铁二院集团有限公司华东公司,杭州310004

出　　处：《都市快轨交通》2014年第4期93-96,100,共5页Urban Rapid Rail Transit

摘　　要：针对宁波软土地区在刚建成盾构隧道结构上方进行基坑开挖的工程实例,采用三维有限元数值模拟和残余应力法,计算分析基坑开挖施工对已建盾构隧道结构的影响。分析坑底加固措施对控制基坑隆起及盾构隧道上浮的作用,同时在上部基坑施工过程中,对刚建成的隧道进行变形监测,并对监测数据进行分析,认为坑底加固有利于提高坑底土体的抗隆起稳定性,可保证基坑的安全。In terms of a real project of foundation pit excavating over a built shield tunnel structure in Ningbo city, 3D finite element method and residual stress method are used to study the influence of foundation pit excavation on the uplift of the shield tunnel. The mechanics of different consolidation methods to control the foundation deformation and shield tunnel uplift are analyzed mainly. The deformation monitoring of the newly built tunnel is carried out and the monitoring data is analyzed at the same time during the construction process of the upper pit. The research can provide a certain reference for similar projects in the future.

关 键 词：城市轨道交通 基坑 盾构隧道 变形 上浮 宁波地铁 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]