地表超载作用下大直径全预制装配盾构隧道受力变形规律研究  

Study on the Deformation Law of Large-diameter Fully Prefabricated Assembled Shield Tunnels under Ground Surcharge

作　　者：朱美恒 陈思睿 黄忠凯 李永波 张吾渝[3] 张冬梅[2] ZHU Meiheng;CHEN Sirui;HUANG Zhongkai;LI Yongbo;ZHANG Wuyu;ZHANG Dongmei(CCCC Tunnel Engineering Co.,Ltd.,Beijing 100102;Department of Geotechnical Engineering College of Civil Engineering,Tongji University,Shanghai 200092;Collegeof Civil Engineering and Water Resources,Qinghai University,Xining 810016)

机构地区：[1]中交隧道工程局有限公司,北京100102 [2]同济大学土木工程学院地下建筑与工程系,上海200092 [3]青海大学土木水利学院,西宁810016

出　　处：《现代隧道技术》2024年第4期161-171,共11页Modern Tunnelling Technology

基　　金：国家重点研发计划课题(2022YFC3800905);上海市“科技创新行动计划”优秀学术/技术带头人计划项目(22XD1430200);同济大学学科交叉联合攻关项目(2022-3-ZD-07).

摘　　要：为满足结构设计要求,大直径全预制装配盾构隧道中隔墙与管片之间会预留一定的变形空间,但是在超载作用下运营期隧道管片与中隔墙可能发生接触,改变隧道结构体系的受力模式,给隧道结构安全运维带来巨大的挑战。鉴于此,依托上海机场联络线隧道工程实例,建立大直径全预制装配盾构隧道三维精细化有限元分析模型,分析地表超载作用下大直径全预制装配盾构隧道管片与中隔墙协同受力和变形规律。研究表明,超载作用下大直径全预制装配盾构隧道管片与中隔墙会发生接触,接触后隧道结构刚度和承载能力提高,但超载作用会引起管片与隧道内部构件损伤,其中弧形构件板底、弧形构件柱帽上方板顶、弧形构件柱帽外侧和中隔墙底部均处于受拉状态,为内部构件易损节点;隧道结构损伤及破坏模式受中隔墙顶部预留间隙影响,为提高隧道承载能力,建议将中隔墙顶部间隙控制在90 mm左右。To meet structural design requirements,a certain deformation space is reserved between the mid-parti⁃tion wall and the segment lining in large-diameter fully prefabricated assembled shield tunnels.However,during the operation period,the segments and mid-partition wall of the tunnel may come into contact under the ground sur⁃charge conditions,changing the stress modes of the tunnel structure and posing significant challenges to the safe opera⁃tion and maintenance of the tunnel structure.In view of this,based on the Shanghai Airport Link Line Tunnel project,a three-dimensional refined finite element analysis model of a large-diameter fully prefabricated assembled shield tunnel was established to analyze the cooperative load bearing and deformation law of the segments and mid-parti⁃tion wall under the ground surcharge conditions.The study shows that under the ground surcharge conditions,the segments and mid-partition wall of the large-diameter fully prefabricated assembled shield tunnel will come into contact,which will improve the stiffness and bearing capacity of the tunnel structure,but the surcharge can cause damage to the segments and internal components of the tunnel.The bottom of the plate of the arc component,the top of the column cap of the arc component,the outer side of column cap of the arc component,and the bottom of the mid-partition wall are all in a tensile state and are the vulnerable nodes.The damage and failure modes of the tunnel structure are affected by the reserved gap at the top of the mid-partition wall.To improve the bearing capacity of the tunnel,it is recommended to control the gap at the top of the mid-partition wall at about 90 mm.

关 键 词：大直径盾构隧道 全预制装配 地表超载 结构变形 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]