地铁盾构隧道整体道床早期离缝病害成因分析
Analysis on the Cause for Early Open Jointing Disease in the Monolithic Ballast Bed of Metro Shield Tunnel
林展鹏 1王波 1梁鹏 1马永浪 1邓非凡1
作者信息
- 1. 中铁西南科学研究院有限公司,四川 成都 610032;中铁成都轨道交通健康管理技术有限公司,四川 成都 610032
- 折叠
摘要
文章建立了地铁盾构隧道内整体道床有限元模型,通过施加等效降温荷载,分析了盾构隧道内整体道床离缝病害的成因,结果显示,整体道床和盾构管片受到的应力水平与混凝土早期收缩程度和龄期增长基本呈正相关;混凝土收缩应力作用下,道床与盾构管片黏结界面端部易产生界面损伤,甚至产生离缝病害,道床早期界面损伤以拉伸和剪切复合破坏模式为主,等效降温荷载达到2℃时就会产生层间损伤;建议开展道床混凝土收缩荷载取值研究,优化盾构隧道整体道床结构形式.
Abstract
The finite element model of monolithic ballast bed in metro shield tunnel is established.By applying the equivalent cooling load,the causes for the open jointing disease of monolithic ballast bed in shield tunnel are analyzed.The results show that the stress level on monolithic ballast bed and shield segment is positively correlated with the early shrinkage degree and age growth of concrete;under the action of concrete shrinkage stress,the interface damage is easy to occur at the end of the bonding interface between the ballast bed and the shield segment,and even the open jointing disease may occur.The early interface damage of the ballast bed is mainly a composite failure mode of tension and shear,and the interlayer damage will occur when the equivalent cooling load reaches 2℃.It is suggested to carry out research on the value of concrete shrinkage load in ballast bed and optimize the monolithic ballast bed structure of shield tunnel.
关键词
道床离缝/地铁盾构隧道/混凝土收缩Key words
ballast bed open jointing/metro shield tunnel/concrete shrinkage引用本文复制引用
出版年
2024
NETL
NSTL
万方数据