软土盾构隧道不均匀沉降注浆抬升机理

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• 英文论文题名：Behavior of Shield Tunnel Caused by Grouting to Reduce the Tunnel Longitudinal Differential Settlement in Soft Ground
• 论文作者：张冬梅 ; 彭茂竹 ; 戴祥东 ; 闫静雅
• 英文论文作者：ZHANG Dongmei ; PENG Maozhu ; DAI Xiangdong ; YAN Jingya ; Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education ; Tongji University ; Department of Geotechnical Engineering ; College of Civil Engineering ; Tongji University ; University of California ; Maintenance Management of Shanghai Metro Co.Ltd.
• 年：2016
• 作者机构：同济大学岩土及地下工程教育部重点实验室;同济大学土木工程学院地下建筑与工程系;加州大学洛杉矶分校;上海地铁维护保障有限公司;
• 论文关键词：双圆盾构隧道 ; 不均匀沉降 ; 注浆抬升 ; 内力
• 英文论文关键词：Double-O-tunnel ; Differential settlement ; Uplift grouting ; Internal force
• 会议召开时间：2016-10-24
• 会议录名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会论文集
• 语种：中文
• 分类号：U455.43
• 学会代码：OGTY
• 会议名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会
• 会议地点：中国四川成都
• 主办单位：中国土木工程学会隧道及地下工程分会
• 学会名称：中国土木工程学会
• 页数：7
• 文件大小：1798k
• 原文格式：O
• 会议级别：全国

摘要

以上海某地铁隧道的微扰动注浆抬升实例为背景,采用数值模拟的方法,分析了注浆对盾构隧道收敛、接头位移、管片位移和内力变化的影响,揭示了微扰动注浆抬升对盾构隧道结构的影响机理。研究发现:注浆能有效改善隧道的不均匀沉降,也会引起隧道附加内力和横向变形的增加,但总体增量较小。注浆引起隧道上半部分变形大于下半部分,但是注浆引起的隧道结构下半部附加内力大于上半部,注浆引起的隧道上半部变形以管片间的相对位移为主,注浆引起海鸥片接头附近管片弯矩增加和轴力减小较为显著。分阶段注浆能有效控制注浆产生的隧道附加内力。
Grouting technology is usually used to reduce the excessive longitudinal differential settlement of shield tunnel in soft soils.Field observations have verified the availability of grouting technology to decrease the longitudinal settlement.On the other hand,grouting can definitely cause additional internal force and deformation of shield tunnel.In this paper,the behavior of shield tunnel was investigated using FEM method in terms of the internal force and convergence of shield tunnel.The grouting process was simulated by volumetric expansion.The following findings were obtained:The grouting can effectively reduce the differential settlement of shield tunnel,the additional internal force and cross-section of deformation caused by grouting is generally small.The grouting-induced tunnel deformation of upper half section is more significant than that of the lower half.It indicates the deformation of upper haK section is caused by movement between tunnel segment.Grouting can increase the internal force of tunnel as a whole,but has a different influence on the upper half of the tunnel and that of the lower half.The staged grouting technology can reduce the grouting-reduced tunnel internal force without affecting the grouting-reduced tunnel uplifting.

引文

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