非对称沉降盾构隧道平面模型的内力分布规律研究
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摘要
以西安地铁2号线工程盾构隧道穿越典型黄土地层为研究对象,分别采用考虑结构与地层相互作用的修正自由变形法和梁-弹簧有限元模型法进行内力的理论分析及对比,探讨衬砌变形的分布和变化规律。通过与实测内力值进行对比,指出此盾构隧道结构设计中考虑典型黄土地层非对称沉降的必要性,揭示其结构性能及与地层的相互作用特征。利用梁-弹簧有限元模型法分析盾构穿越地层地下水位变化引起非对称沉降作用下衬砌的内力分布规律,可提升盾构隧道结构设计的安全性和经济性,达到优化和指导此地层条件下衬砌结构适应性设计的目的。
Taking the shield tunnel passing through the typical loess stratum in Xi'an metro line No.2 engineering as the research object,the theoretical analysis and comparison of internal force were conducted with the modified free deformation method and beam-spring finite element model method considering the interaction between structure and strata,and the distribution and variation regularity of lining deformation were discussed.Compared with the measured value of internal force,this paper reminded that the asymmetric subsidence in typical loess stratum should be considered in the shield tunnel structure design for revealing the structure performance and its interaction characteristics with the strata.By using the beam-spring finite element model,the internal force distribution regularity of lining under action of asymmetric subsidence caused by groundwater level change was analyzed when the shield passes through the strata /which could improve the safety and economy of the shield tunnel structure design to optimize and guide the adaptability design of lining structure under the condition of this stratum.
Taking the shield tunnel passing through the typical loess stratum in Xi'an metro line No.2 engineering as the research object,the theoretical analysis and comparison of internal force were conducted with the modified free deformation method and beam-spring finite element model method considering the interaction between structure and strata,and the distribution and variation regularity of lining deformation were discussed.Compared with the measured value of internal force,this paper reminded that the asymmetric subsidence in typical loess stratum should be considered in the shield tunnel structure design for revealing the structure performance and its interaction characteristics with the strata.By using the beam-spring finite element model,the internal force distribution regularity of lining under action of asymmetric subsidence caused by groundwater level change was analyzed when the shield passes through the strata /which could improve the safety and economy of the shield tunnel structure design to optimize and guide the adaptability design of lining structure under the condition of this stratum.
引文
[1]马哲.兰州地铁一号线下穿黄河砂卵石地层盾构管片分型及优化设计[J].铁道建筑,2014(6):78-81.
[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.
[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].地下空间与工程学报,2003,23(4):352-356.
[4]陈丹.北京地铁盾构隧道管片设计方法比较[J].铁道标准设计,2009(10):60-64.
[5]WOOD A M M.The Circular Tunnel in Elastic Ground[J].Géotechnique,1975,25(1):115-127.
[6]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB 50307—2012城市轨道交通岩土工程勘察规范[S].北京:中国计划出版社,2012.
[7]BLOM C B M,van der HORST E J,JOVANOVIC P S.Threedimensional Structural Analyses of the Shield-driven“Green Heart”Tunnel of the High-speed Line South[J].Tunnelling and Underground Space Technology,1999,14(2):217-224.
[8]黄宏伟,徐凌,严佳梁,等.盾构隧道横向刚度有效率研究[J].岩土工程学报,2006,28(1):11-18.
[9]汪辉武,郭建宁,李国栋,等.宁波地铁1号线高流变软土地层盾构掘进参数分析[J].铁道建筑,2014(6):49-54.
[10]何川,封坤,苏宗贤.大断面水下盾构隧道原型结构加载试验系统的研发与应用[J].岩石力学与工程学报,2011,30(2):254-266.
[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.
[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].地下空间与工程学报,2003,23(4):352-356.
[4]陈丹.北京地铁盾构隧道管片设计方法比较[J].铁道标准设计,2009(10):60-64.
[5]WOOD A M M.The Circular Tunnel in Elastic Ground[J].Géotechnique,1975,25(1):115-127.
[6]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB 50307—2012城市轨道交通岩土工程勘察规范[S].北京:中国计划出版社,2012.
[7]BLOM C B M,van der HORST E J,JOVANOVIC P S.Threedimensional Structural Analyses of the Shield-driven“Green Heart”Tunnel of the High-speed Line South[J].Tunnelling and Underground Space Technology,1999,14(2):217-224.
[8]黄宏伟,徐凌,严佳梁,等.盾构隧道横向刚度有效率研究[J].岩土工程学报,2006,28(1):11-18.
[9]汪辉武,郭建宁,李国栋,等.宁波地铁1号线高流变软土地层盾构掘进参数分析[J].铁道建筑,2014(6):49-54.
[10]何川,封坤,苏宗贤.大断面水下盾构隧道原型结构加载试验系统的研发与应用[J].岩石力学与工程学报,2011,30(2):254-266.