地铁振动下盾构隧道道床剥离病害演化规律研究  

Study on the Evolution of Detachment Disease of Shield Tunnel Track Bed under Metro Vibration

作　　者：陈鹏涛 漆泰岳[1,2] 梁孝 雷波[1,2] 晋智毅 CHEN Pengtao;QI Taiyue;LIANG Xiao;LEI Bo;JIN Zhiyi(MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《防灾减灾工程学报》2023年第4期797-806,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金面上项目(51978582)资助。

摘　　要：盾构隧道整体道床剥离病害是影响地铁行车稳定和运营安全的重要因素。为研究列车振动作用下剥离病害的演化规律,以成都地铁某区段为背景,使用有限元软件ABAQUS建立盾构隧道数值模型,根据地层情况、列车轴重及载客情况确定隧道结构受力,利用DLOAD子程序编写移动荷载实现列车动载模拟,分析列车动载作用下剥离的分布及发展规律,确定结构最薄弱位置。同时,设计剥离裂缝现场动态监测系统并用于实测,得到的实测结果与数值模拟规律一致。最后根据研究中涉及的影响因素提出了剥离病害的防治建议。研究结果表明:①列车动载作用初期的冲击荷载对道床剥离影响最大,随后在动载作用下,剥离量幅值会逐渐减小;②道床伸缩缝是结构最薄弱位置,列车动载作用引起伸缩缝处的剥离量最大;③提升道床-管片结构整体性可作为病害防治设计思路,如提升道床与管片间粘结面强度、增加锚固措施等,可减少剥离病害的发生。Shield tunnel monolithic track bed detachment is an important factor affecting the stability and operational safety of the metro.In order to study the evolution of detachment disease of track bed under the action of train vibration,a section of the Chengdu metro was used as a background to estab-lish a numerical model of the shield tunnel using the finite element software ABAQUS.The forces on the tunnel structure were determined according to the ground conditions,the axle weight of the train and the passenger load,and the DLOAD subroutine was used to program the moving load to realize the simulation of dynamic train load.The distribution and development pattern of detachment under dynamic train loads was analyzed and the weakest position of the structure was identified.At the same time,an on-site dynamic monitoring system for detachment cracks was designed and used for site mea-surements,and the results obtained were consistent with the numerical simulation.Finally,recom-mendations for the control of detachment disease were made based on the influencing factors involved in the study.The results of the study show that:(1)The impact load at the beginning of the train's dy-namic action has the greatest effect on the detachment of the track bed,and then the magnitude of the detachment decreases under dynamic action.(2)The expansion joint in the track bed is the weakest position in the structure and the detachment amount at the joint is the largest due to dynamic train loads.(3)Improving the structural integrity of the bed and lining can be used as a design idea for dis-ease prevention and control,such as improving the strength of the bonding surface between the bed and the lining and increasing anchorage measures,which can reduce the occurrence of detachment dis-ease.

关 键 词：盾构隧道 整体道床 剥离病害 列车振动 数值模拟 现场监测 

分 类 号：TU443[建筑科学—岩土工程]