软土错缝拼装盾构隧道横断面变形控制限值研究  

Control Limit Value of Cross Section Deformation of Shield Tunnel Structures with Staggered Joints

作　　者：佘才高 张存 王怀东 田志尧 SHE Caigao;ZHANG Cun;WANG Huaidong;TIAN Zhiyao(Nanjing Metro Group Co.,Ltd.,Nanjing 210008;China Railway sixth survey and Design Institute Group Co.,Ltd.,Tianjin 300308;The Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Tongji University,Shanghai 201804)

机构地区：[1]南京地铁集团有限公司,南京210008 [2]中铁第六勘察设计院集团有限公司,天津300308 [3]同济大学道路与交通工程教育部重点实验室,上海轨道交通基础设施耐久性与系统安全重点实验室,上海201804

出　　处：《都市快轨交通》2021年第5期119-127,共9页Urban Rapid Rail Transit

基　　金：国家自然科学基金(面上项目)(51978523)。

摘　　要：部分软土地区的盾构隧道结构出现过大的变形与严重的病害,这些带病服役的盾构隧道结构仍将长时间服役,且其后续服役期内也将面临各类不利的服役环境。因此,有必要提出盾构隧道结构变形控制限值,在隧道结构变形进一步发展时,为结构的养护运维及时提供判断、决策依据。以南京某3个地铁区间为背景,分别以实测数据分析、三维精细化有限元模拟为手段,探究错缝拼装盾构隧道结构横断面的收敛变形与各类病害之间的相关关系。通过两种手段相互验证与补充发现:收敛变形小于30 mm时,隧道结构的服役性能良好;30~60 mm,出现渗漏水、裂缝,且螺栓开始屈服;60~80 mm,病害加剧,出现管片破损;80~100 mm,首个螺栓到达抗拉极限状态,安全性受到极大威胁;大于100 mm,整环结构濒临屈服。据此得到结构性能的衰退特性,进一步提出盾构隧道横断面变形控制限值。Excessive deformation and serious deterioration have occurred in some shield tunnel structures in soft soil areas.These structures with defects will be in service for a long time,and face various adverse service environments.Therefore,it is necessary to propose the control limit of shield tunnel structure deformation,which can be a judgment and decision-making basis for the maintenance and operation of the structure when there is further deformation.Based on the background of three subway sections in Nanjing,this study explores the correlation between cross-sectional convergence deformation and various diseases of staggered seam-assembled shield tunnels using measured data analysis and three-dimensional refined finite element simulation.The two methods verify and complement each other.The results show that the service performance of the tunnel structure is good when the convergence deformation is less than 30 mm.At 30~60 mm,water leakage and cracks appear and the bolts begin to yield.The disease intensifies and the segment is damaged at 60~80 mm;the first bolt reaches the tensile limit state and the safety is greatly threatened at 80~100 mm.The entire ring structure is on the verge of yield when the damage is greater than 100 mm.On the structural performance degradation characteristics,the control limit of the cross-sectional deformation of the shield tunnel is proposed.

关 键 词：轨道交通 盾构隧道 错缝拼装 横断面变形 控制限值 数值模拟 

分 类 号：U231[交通运输工程—道路与铁道工程]