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| Research on the Law and Controlled Limit Value of Transverse Deformation for Shield Tunnel in Soft Clay |
| ZHU Bin |
| Nanjing Metro Corporation, Nanjing, Jiangsu 210024, China |
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Abstract Research purposes:The transverse deformation of shield tunnel may deeply threaten the safety of tunnel structure.Excessive deformation may lead segment joints to open and leak and segments to craze. The deformation may even cause insufficient cross-section limit and the missing of structural-load-carrying capacity of the tunnel. On the other hand, it costs a lot to repair and reinforce the shield tunnel. In order to determine the proper moment to repair segments and ensure the safety of tunnel structure as well as economical efficiency, it is necessary to study the deformation law and limit value of the transverse section of the tunnel.Research conclusions:Based on the analysis of the influencing factors to causing the transverse deformation, the following conclusions was proposed: (1) The root of transverst deformation is increase of vertical and horizontal load ratio. (2)The shield tunnel properties of Nanjing Metro Line 2 was adapted to analyze the relationship between the variation of tunnel horizontal diameter andmaximum rate of joint opening,tress rate of both bolt and concrete using numerical simulation, furthermore the controlled limit value of transverse deformationwas got,the bolt tress achieve maximal strength when the variation of tunnel horizontal diameter reach 123 mm for sequential segment seams,and 127 mm for staggeredsegment seams, which means severely threaten to the safety of shield tunnel. Finally the precontrol and governance methodswere delivered to different influencing factors. (3)The research results can provide references to determine the controlling methods and restoration moment of the transverse deformation.
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Received: 26 May 2014
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[1] 叶耀东. 软土地区运营地铁盾构隧道结构变形与健康诊断方法研究[D]. 上海:同济大学,2007.
Ye Yaodong. Research on Deformation and Method of Health Diagnose of Operational Subway Structures in Soft Soil[D]. Shanghai: Tongji University,2007.
[2] 王如路,张冬梅. 超载作用下软土盾构隧道横向变形机理及控制指标研究[J].岩土工程学报,2013(6):1092-1101.
Wang Rulu, Zhang Dongmei. Evolution of Transverse Deformation and Assessment Index for Operation Shield Tunnel under Surface Surcharge in Soft Clay[J].Chinese Journal of Geotechnical Engineering, 2013(6):1092-1101.
[3] 黄小平, 杨新安, 雷震宇, 等. 地铁运营隧道收敛变形分析[J]. 城市轨道交通研究, 2009(3):55-58.
Huang Xiaoping, Yang Xinan, Lei Zhenyu, etc. On Convergent Deformation of the Existing Metro Tunnel[J]. Urban Mass Transit, 2009(3):55-58.
[4] 刘建国. 盾构管片密封垫防水机理及应用研究[D]. 上海:同济大学,2010.
Liu Jianguo. The Research about the Waterproofing Performance of the Seal for the Shield Tunnel Segments[D]. Shanghai: Tongji University,2010.
[5] 戴志仁. 盾构隧道衬砌结构计算模型探讨[J]. 铁道工程学报,2013(6):52-58.
Dai Zhiren. Discussion on Calculation Model for Lining Structure of Shield Tunnel[J]. Journal of Railway Engineering Society, 2013(6):52-58.
[6] 郑永来, 韩文星, 童琪华, 等. 软土地铁隧道纵向不均匀沉降导致的管片接头环缝开裂研究[J]. 岩石力学与工程学报, 2005(24):4552-4558.
Zheng Yonglai, Han Wenxing, Tong Qihua, etc. Study on Longitudinal Crack of Shield Tunnel Segment Joint Due to Asymmetric Settlement in Soft Soil[J].Chinese Journal of Rock Mechanic and Engineering, 2005(24):4552-4558.
[7] 张厚美, 张正林, 王建华. 盾构隧道装配式管片接头三维有限元分析[J]. 上海交通大学学报, 2003(4):566-569.
Zhang Houmei, Zhang Zhenglin, Wang Jianhua. 3-D FEM Analysis on Prefabricated Segment Joints of Shield Tunnel[J]. Journal of Shanghai Jiaotong University, 2003(4): 566-569.
[8] 张厚美. 盾构隧道的理论研究和施工实践[M]. 北京:中国建筑工业出版社,2010.
Zhang Houmei. Shield Tunnel Theoretical Research and Construction Practice[M]. Beijing:China Architecture & Building Press,2010.
[9] 王如路,贾坚,廖少明. 上海地铁监护实践[M]. 上海:同济大学出版社,2013.
Wang Rulu,Jia Jian, Liao Shaoming. Metro Monitoring Practice in Shanghai[M]. Shanghai:Tongji University Press,2013. |
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2014, Vol. 31 
