盾构隧道整体道床剥离病害规律研究  

Study on the Law of Separation Defects of Monolithic Track Bed in Shield Tunnels

作　　者：何剑 彭玥锴 梁孝 漆泰岳[2,3] HE Jian;PENG Yuekai;LIANG Xiao;QI Taiyue(China Railway City Development and Investment Group Co.,Ltd.,Chengdu 610218;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031)

机构地区：[1]中铁城市发展投资集团有限公司,成都610218 [2]西南交通大学土木工程学院,成都610031 [3]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《现代隧道技术》2022年第1期232-240,共9页Modern Tunnelling Technology

基　　金：国家自然科学基金(51978582)。

摘　　要：盾构隧道整体道床的剥离病害已严重影响地铁的安全运营。为研究整体道床剥离病害的规律,文章以国内某运营地铁线路为工程背景,建立整体道床-管片-注浆层数值模型进行分析研究。结果表明:列车轮组作用在道床一侧靠近伸缩缝位置时会引起较大的道床剥离变形,是最不利位置;列车荷载在振动作用下引起的剥离量远大于静载作用时的,且两者间存在函数关系;伸缩缝位置是最易发生剥离的区域,剥离首先发生在伸缩缝两侧边缘,随列车动载作用时间增加,剥离区域扩展至伸缩缝1.5 m范围内;注浆层刚度与接触面黏结强度均是影响剥离量的重要因素,提升注浆层刚度和道床-管片接触面的黏结强度可有效减少剥离量。The separation defects of monolithic track bed in shield tunnels have seriously affected the safety of subway operation. In order to study the law of separation defects of monolithic track bed, taking an operating subway line in China as the engineering background, it establishes a numerical model of monolithic track bed-segmentgrouting layer. The research results show that:(1) when the train wheel set acts on one side of the track bed near the expansion joint, it will cause larger separation deformation of the track bed, which is the most unfavorable position;(2) the separation amount caused by train load under vibration is much greater than that under static load, and there is a functional relationship between the two separations;(3) the location of the expansion joint is the area where separation is most likely to occur. The separation first occurs at the edges of both sides of the expansion joint, and with the increase of the action time of the dynamic load of train, the separation area extends to 1.5 m of the expansion joint;and(4) both the grouting layer stiffness and the contact surface bond strength are important factors affecting the separation amount, and increasing the stiffness of the grouting layer and the bond strength of the track bed-segment contact surface can effectively reduce the separation amount.

关 键 词：盾构隧道 整体道床 剥离病害 有限元分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]