软土地基大直径地铁盾构隧道衬砌结构受力特性数值分析研究
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摘要
为得到能真实反应软土地基大直径盾构隧道结构受力特点又能保证衬砌结构安全的设计模型,结合广州轨道交通4号线南延段大直径地铁盾构隧道结构现场实测结果,采用ANSYS软件研究适用于软土地基大直径盾构隧道衬砌结构设计的计算模型。基于反分析得到的设计模型,对水平侧压力系数、地基弹簧刚度、管片厚度、管片接头位置、管片分块数量等影响大直径盾构隧道衬砌结构受力特性的因素进行敏感性分析。结果表明:1)采用地基弹簧模拟底部反力并通过调整弹簧的范围可得到既能真实反映衬砌结构受力特性又能保证结构安全性的计算模型; 2)衬砌结构受力对侧压力系数和管片厚度敏感,对地基刚度不敏感; 3)接头位置变化和管片分块数量主要影响布置地基弹簧范围内的管片受力。
A design model that can reflect the structural characteristics of large-diameter shield tunnels in soft ground and ensure the safety of lining structures is a necessary. Hence,a calculation model for design of lining structure of large-diameter metro shield tunnel used in soft ground of South Extension Line on Guangzhou Rail Transit Line No. 4 is established by software ANSYS. And then the sensitivity of the factors affecting the lining structures of large-diameter shield tunnels,i.e. horizontal lateral pressure coefficient,foundation spring stiffness,segment thickness,segment joint position and segment partitioning number,is analyzed based on back analysis-obtained design model. The results show that:( 1) A calculation model that can reflect actual mechanical behaviors of lining structure and ensure the structural safety can be obtained by adopting soil spring to simulate the bottom reaction force and adjusting the range of the spring in the design model.( 2) The structural performance of the lining is sensitive to the lateral pressure coefficient and the thickness of the segment,but not to the stiffness of the foundation stiffness.( 3) The segment joint position and segment partitioning number mainly affect the mechanical performance of the segments within the range of foundation springs.
A design model that can reflect the structural characteristics of large-diameter shield tunnels in soft ground and ensure the safety of lining structures is a necessary. Hence,a calculation model for design of lining structure of large-diameter metro shield tunnel used in soft ground of South Extension Line on Guangzhou Rail Transit Line No. 4 is established by software ANSYS. And then the sensitivity of the factors affecting the lining structures of large-diameter shield tunnels,i.e. horizontal lateral pressure coefficient,foundation spring stiffness,segment thickness,segment joint position and segment partitioning number,is analyzed based on back analysis-obtained design model. The results show that:( 1) A calculation model that can reflect actual mechanical behaviors of lining structure and ensure the structural safety can be obtained by adopting soil spring to simulate the bottom reaction force and adjusting the range of the spring in the design model.( 2) The structural performance of the lining is sensitive to the lateral pressure coefficient and the thickness of the segment,but not to the stiffness of the foundation stiffness.( 3) The segment joint position and segment partitioning number mainly affect the mechanical performance of the segments within the range of foundation springs.
引文
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[10]郭信君,闵凡路,钟小春,等.南京长江隧道工程难点分析及关键技术总结[J].岩石力学与工程学报,2012,31(10):2154.GUO Xinjun, MIN Fanlu, ZHONG Xiaochun, et al.Summaries of key technologies and difficulties in NanjingYangtze River Tunnel Project[J]. Chinese Journal of RockMechanics and Engineering,2012,31(10):2154.
[11]周松,荣建,陈立生,等.单管双线大直径地铁盾构隧道施工与监测[J].地下空间与工程学报,2013,9(2):365.ZHOU Song, RONG Jian, CHEN Lisheng, et al.Construction and monitoring of single underground railwaytunnel with dual carriageway using large-diameter shield[J]. Chinese Journal of Underground Space andEngineering,2013,9(2):365.
[12]王建,叶宇航,刘加福,等.软土地基大直径地铁盾构隧道运营期衬砌结构受力特性现场测试研究[J].隧道建设,2017,37(7):781.WANG Jian,YE Yuhang,LIU Jiafu,et al. Field testingstudy of mechanical behaviors of lining structure of large-diameter metro shield tunnel in soft soil ground in operationphase[J]. Tunnel Construction,2017,37(7):781.
[13]郭瑞.盾构隧道管片衬砌结构稳定性问题研究[D].成都:西南交通大学,2014.GUO Rui. Research on stability of segmental Liningstructure for shield tunnel[D]. Chengdu:SouthwestJiaotong University,2014.
[2]日本土木学会.隧道标准规范(盾构篇)及解说[M].朱伟,译.北京:中国建筑工业出版社,2001.Japan Society of Civil Engineers. Tunnel standardspecification and explanation:Shield[M]. Translator:ZHUWei. Beijing:China Architecture&Building Press,2001.
[3]朱伟,胡如军,钟小春.几种盾构隧道管片设计方法的比较[J].地下空间,2003,23(4):352.ZHU Wei, HU Rujun, ZHONG Xiaochun. Comparativestudy of several segment design methods for shield tunnels[J]. Underground Space,2003,23(4):352.
[4] KOYAMA Y. Present status and technology of shield tunnelingmethod in Japan[J]. Tunnelling and Underground SpaceTechnology,2003,18(2):145.
[5]朱合华,杨林德,陈清军,等.盾构隧道管片接头衬砌系统的两种受力设计模型[J].工程力学,1996(增刊):395.ZHU Hehua,YANG Linde,CHEN Qingjun,et al. Twodesign mechanical models for segment joints of liningstructure of shield tunnel[J]. Engineering Mechanics,1996(S):395.
[6]孙巍,官林星,温竹茵.大断面矩形盾构法隧道的受力分析与工程应用[J].隧道建设,2015,35(10):1028.SUN Wei, GUAN Linxing, WEN Zhuyin. Mechanicalanalysis and application of large rectangular cross-sectionshield tunnel[J]. Tunnel Construction,2015,35(10):1028.
[7]《中国公路学报》编辑部.中国隧道工程学术研究综述·2015[J].中国公路学报,2015,28(5):1.Editorial Department of China Journal of Highway andTransport. Review on China's tunnel engineering research:2015[J]. China Journal of Highway&Transport,2015,28(5):1.
[8]肖明清.武汉长江隧道工程概况[J].土工基础,2005,19(1):2.XIAO Mingqing, General situation of Changjiang Tunnelengineering in Wuhan[J]. Soil Engineering and Foundation,2005,19(1):2.
[9]黄融.上海崇明越江通道长江隧道工程综述(一):长江隧道工程设计[J].地下工程与隧道,2008(1):2.HUANG Rong. Shanghai Yangtze River Tunnel of ShanghaiChongming River-crossing Project:Yangtze River Tunneldesign[J]. Underground Engineering and Tunnels,2008(1):2.
[10]郭信君,闵凡路,钟小春,等.南京长江隧道工程难点分析及关键技术总结[J].岩石力学与工程学报,2012,31(10):2154.GUO Xinjun, MIN Fanlu, ZHONG Xiaochun, et al.Summaries of key technologies and difficulties in NanjingYangtze River Tunnel Project[J]. Chinese Journal of RockMechanics and Engineering,2012,31(10):2154.
[11]周松,荣建,陈立生,等.单管双线大直径地铁盾构隧道施工与监测[J].地下空间与工程学报,2013,9(2):365.ZHOU Song, RONG Jian, CHEN Lisheng, et al.Construction and monitoring of single underground railwaytunnel with dual carriageway using large-diameter shield[J]. Chinese Journal of Underground Space andEngineering,2013,9(2):365.
[12]王建,叶宇航,刘加福,等.软土地基大直径地铁盾构隧道运营期衬砌结构受力特性现场测试研究[J].隧道建设,2017,37(7):781.WANG Jian,YE Yuhang,LIU Jiafu,et al. Field testingstudy of mechanical behaviors of lining structure of large-diameter metro shield tunnel in soft soil ground in operationphase[J]. Tunnel Construction,2017,37(7):781.
[13]郭瑞.盾构隧道管片衬砌结构稳定性问题研究[D].成都:西南交通大学,2014.GUO Rui. Research on stability of segmental Liningstructure for shield tunnel[D]. Chengdu:SouthwestJiaotong University,2014.