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隧道建设(中英文)

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软土地区盾构隧道管片开裂特性实测分析及影响因素研究

谢家冲1,王金昌1, *,黄伟明1,赵洁黎2,戚幸鑫3   

  1. (1.浙江大学 建筑工程学院, 浙江 杭州 3100582. 杭州杭港地铁有限公司, 浙江 杭州 310000 3. 西南交通大学  土木工程学院, 四川 成都 610036)

  • 出版日期:2020-11-24 发布日期:2020-11-24
  • 作者简介:谢家冲(1996—),男,浙江余姚人,浙江大学道路与交通工程专业在读硕士,研究方向为盾构隧道结构非线性分析。E-mail:370007@zju.edu.cn。*通信作者:王金昌,E-mail:wjc501@zju.edu.cn。

Study on Cracking Characteristic of TBM Tunnel Lining in Soft Soil Area and Its Influencing Factors

XIE Jiachong1, WANG Jinchang1, *, HUANG Weiming1, ZHAO Jieli2, QI Xingxin3   

  1. (1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China;

    2. Hangzhou MTR Corporation Co., Ltd., Hangzhou 310000, Zhejiang, China; 3. College of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China)

  • Online:2020-11-24 Published:2020-11-24

摘要: 基于某软土地区城市地铁1号线的实测数据,统计分析了该地铁线路整体与典型区间的病害情况与裂缝分布特点,结果表明管片裂缝的分布密度与隧道收敛位移具有明显关联性,区间的隧道病害以密布于隧道拱顶的纵向裂缝为主,且分布规律与管环旋转角度相关。在此基础上,为了探明软弱地层条件对盾构隧道带来的不利影响,基于损伤力学的非线性数值分析手段建立了地层结构法有限元模型,模型中管片采用弥散开裂本构并嵌入简化的钢筋网单元,纵向接头通过考虑张开的间隙接触模型模拟。计算结果阐明了管片开裂特性与影响因素,结果表明:1) 随着地层土体弹性模量和侧压力系数的减小,在地应力条件下隧道损伤区域明显增加;2)随着埋深的增加,当前主要开裂区与预测开裂区深度在原有基础上进一步扩展,从而引起整体开裂率的上升;3)参数分析探明了实测拱顶裂纹分布规律的成因为封顶块的位置的差异。

关键词: 盾构隧道, 病害, 实测分析, 管片开裂, 结构非线性

Abstract:

Based on the field data of Metro Line 1 of a certain city in soft soil area, the disease state and crack pattern of the whole line and a typical section in soft soil area were statistically analyzed. Statistical results show that the distribution of the cracks is demonstrably related to the convergence displacement of the tunnel. And longitudinal crack turns to be the main disease in metro section, while it is densely distributed on the tunnel vault and its distribution regularity is related to the rotation angle of the ring. On this basis, in the way of nonlinear numerical analysis method of damage mechanics, a layer-structure numerical model was established in order to analyze the adverse effects of weak ground conditions on tunnel rings. The segment was given the smeared crack model and was embedded with simplified reinforcement grid elements, while the longitudinal joint was simulated by the gap contact model in order to consider the joint opening. The cracking characteristic of the segment and its influencing factors were illustrated from calculation results. The results show that: 1) when the elastic modulus and lateral pressure coefficient of surrounding soil increase, the tunnel damage area rises significantly under in-situ stress condition. 2) As the burial depth increases, the current crack zone and the predicted crack zone depth further expand on the original basis, resulting in an increase in overall crack rate. 3) The cause of the crack pattern on the tunnel vault revealed by the parameter analysis is the position of the key segment.

Key words: TBM tunnel, disease, measurement analysis, segment crack, structural nonlinear