上软下硬复合地层中盾构隧道管片受力变形性态研究

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• 英文论文题名：Mechanical and Deformation Behaviors of Shield Tunnel Segment under the Condition of Upper-Soft and Lower-Hard Composite Stratum
• 论文作者：雷凯 ; 莫海鸿 ; 陈俊生 ; 李康
• 英文论文作者：LEI Kai ; MO Haihong ; CHEN Junsheng ; LI Kang ; School of Civil Engineering and Transportation ; South China University of Technology ; State Key Laboratory of Subtropical Building Science ; South China University of Technology
• 年：2016
• 作者机构：华南理工大学土木与交通学院;亚热带建筑科学国家重点实验室;
• 论文关键词：复合地层 ; 地层复合比 ; 盾构 ; 管片 ; 内力和变形
• 英文论文关键词：Composite stratum ; The ratio of soft soil ; Shield tunnel ; Segment ; Mechanical and deformation behaviors
• 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：8
• 文件大小：2695k
• 原文格式：O
• 会议级别：全国

摘要

本文以珠机市区至珠海机场地铁盾构工程为背景,采用三维有限元软件MIDAS GTS/NX建立了精细的三维管片模型,模拟上软下硬复合地层中盾构隧道管片的受力特征,与修正惯用法计算的结果进行对比,分析了上软下硬地层中盾构隧道管片的变形及内力,并对管片环在岩层中的地层复合比进行参数分析。研究结果表明:上软下硬复合地层中,管片拱底处几乎没有竖向位移,管片拱顶向内侧收敛,地层复合比为0~0.5时,水平最大位移几乎不发生变化,而当地层复合比为0.5~1时,水平最大位移与地层复合比呈现一次线性增长关系。在设计时轴力取修正惯用法得到的最大轴力的1.3倍进行设计,弯矩的取值与地层复合比有关,当地层复合比为0.5~1时,在设计时可以对修正惯用法计算得到的弯矩进行折减,折减系数取为地层复合比β,当地层复合比为0加.5时,取折减系数取为0.5进行设计即可。
Taking the shield tunnel project of downtown to airport subway line in Zhuhai as the research background,this paper adopted three-dimensional finite element software MIDAS GTS/NX to build 3D simulation model,which included the segment and bolt,to simulate the deformation and stress during the shield tunneling under the condition of upper-soft and lower-hard composite ground.And then,compared with the result calculated by modified routine method it analyzed the deformation and stress during the shield tunneling under the condition of upper-soft and lower-hard composite ground,and analyzed the influence of the ratio of soft soil in complex formation.The results shows that there are almost no vertical displacement at the crown,and the arch segment convergences to the inner side under the condition of upper-soft and lower-hard composite stratum.The maximum horizontal displacement hardly changed when the ratio of soft soil is 0 to 0.5 with showing a linear relationship when the ratio of soft soil is 0.5 to 1.The 1.3 times of axial force calculated by modified routine method can be used in shield tunnel segment structure design,the bending moment of segment is related to the ratio of soft soil,it can be reduced by reduction coefficient β when the ratio of soft soil is 0.5 to l.And when the ratio of soft soil is 0 to0.5,the reduction coefficient is 0.5.

引文

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