中隔板对单洞双层隧道抗震性能的影响
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摘要
单洞双层隧道是一种具有广阔应用前景的地下结构形式,大高跨比及中隔板约束使其拥有独特的力学特性。为了给单洞双层隧道的结构抗震优化设计提供依据,以伏龙坪单洞双层隧道为背景,利用FLAC3D软件,采用动力时程分析法研究中隔板位置对单洞双层隧道抗震性能的影响,并与静力分析结果进行比较。结果表明:中隔板的使用让双层隧道的抗震性能大幅提升,无中隔板时的边墙动力水平相对位移幅值较有中隔板时放大2.9~3.4倍;边墙动力水平相对位移幅值可以作为评价衬砌结构动力反应的依据;受动力作用,衬砌位移、应力都会有显著放大;静力作用与动力作用时,中隔板的最佳位置不同。
The single-hole double-decked tunnel is an underground structure style with broad application prospects,and it has unique mechanical properties because of the large ratio of depth to span and the partition constraints of baffle plate.Taking Fulongping double-decked tunnel as an example,the dynamic time history analysis method is used to study the impact of baffle plate on the seismic performance of the single-hole double-decked tunnel with software FLAC3D.The dynamic results are compared with those of static analysis,in order to provide a basis for structural optimization design on earthquake resistance for single-hole double-decked tunnels.The results prove that the baffle plate improves the seismic performance of tunnels sharply,and the dynamic relative horizontal displacement amplitude without baffle plate is 2.9-3.4 times the amplitude with baffle plate.The dynamic relative horizontal displacement amplitude of side wall can be used to evaluate the dynamic response of the lining.There is a significant amplification in displacement & stress of lining under dynamic force.It is different in the optimum position of baffle plate under static loading and dynamic loading,respectively.
The single-hole double-decked tunnel is an underground structure style with broad application prospects,and it has unique mechanical properties because of the large ratio of depth to span and the partition constraints of baffle plate.Taking Fulongping double-decked tunnel as an example,the dynamic time history analysis method is used to study the impact of baffle plate on the seismic performance of the single-hole double-decked tunnel with software FLAC3D.The dynamic results are compared with those of static analysis,in order to provide a basis for structural optimization design on earthquake resistance for single-hole double-decked tunnels.The results prove that the baffle plate improves the seismic performance of tunnels sharply,and the dynamic relative horizontal displacement amplitude without baffle plate is 2.9-3.4 times the amplitude with baffle plate.The dynamic relative horizontal displacement amplitude of side wall can be used to evaluate the dynamic response of the lining.There is a significant amplification in displacement & stress of lining under dynamic force.It is different in the optimum position of baffle plate under static loading and dynamic loading,respectively.
引文
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[13]熊良宵,李天斌,刘勇.隧道地震响应数值模拟研究[J].地质力学学报,2007,13(3):255-260.XIONG Liang xiao,LI Tian bin,LIU Yong.Numerical simulation of seismic response at the entrance of the unsymmetrical loading tunnel[J].Journal of Geomechanics,2007,13(3):255-260.
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[15]胡聿贤.地震工程学[M].北京:地震出版社,2006:91-104.
[16]李海波,刘博,吕涛,等.一种简单的岩体地下洞室地震安全评价方法[J].岩土力学,2009,30(7):1873-1882.LI Hai bo,LIU Bo,LüTao,et al.A simple safety assessment method for underground engineering in rock under seismic loading[J].Rock andSoil Mechanics,2009,30(7):1873-1882.
[17]焦冬雪,刘元雪,陆新.单洞双层隧道围岩力学特性分析[J].地下空间与工程学报,2009,5(增1):1388-1392.JIAO Dong xue,LIU Yuan xue,LU Xin.The mechanical property of surrounding rock about single cavern and double layer tunnel[J].ChineseJournal of Underground Space and Engineering,2009,5(Supp.1):1388-1392.
[2]戚乐磊,赵鸿铁,梁若筠,等.双层隧道衬砌结构静力分析[J].西安建筑科技大学学报:自然科学版,2002,34(4):333-337.QI Le lei,ZHAO Hong tie,LIANG Ruo jun,et al.Static analysis of double deck tunnel lining[J].Journal of Xi’an University of Architecture&Technology:Natural Science Edition,2002,34(4):333-337.
[3]陈小良,刘元雪,李忠友.双层隧道中隔板的位置优化[J].地下空间与工程学报,2010,6(增2):1625-1628.CHEN Xiao liang,LIU Yuan xue,LI Zhong you.Optimal location research of the baffle plate on the double decked tunnel[J].Chinese Journal ofUnderground Space and Engineering,2010,6(Supp.2):1625-1628.
[4]陈小良,刘元雪,李忠友.双层隧道边墙位置研究[J].后勤工程学院学报,2010,26(6):12-16.CHEN Xiao liang,LIU Yuan xue,LI Zhong you.Research on the location of the lateral wall in the double deck tunnel[J].Journal of LogisticalEngineering University,2010,26(6):12-16.
[5]时亚昕,王明年,李强.单洞双层地铁隧道施工力学行为[J].岩石力学与工程学报,2006,25(增1):2985-2990.SHI Ya xin,WANG Ming nian,LI Qiang.Construction mechanical behavior of metro tunnel with single cavern and double layer[J].Chinese Jour nal of Rock Mechanics and Engineering,2006,25(Supp.1):2985-2990.
[6]牛泽林,李德武,王步云.伏龙坪双层隧道弹塑性有限元分析[J].兰州交通大学学报:自然科学版,2004,23(4):31-33.NIU Ze lin,LI De wu,WANG Bu yun.Analysis of Fulongping double decked tunnel with elasto plastic finite element[J].Journal of Lanzhou Jiao tong University:Natural Sciences,2004,23(4):31-33.
[7]牛泽林,李德武,王步云.伏龙坪双层隧道三维有限元分析[J].中南公路工程,2007,32(3):144-146,175.NIU Ze lin,LI De wu,WANG Bu yun.The analysis of Fu Longping double decked tunnel with 3D finite element[J].Central South Highway Engi neering,2007,32(3):144-146,175.
[8]林皋.地下结构抗震分析综述:上[J].世界地震工程,1990,5(2):1-10.
[9]林皋.地下结构抗震分析综述:下[J].世界地震工程,1990,5(3):1-10,42.
[10]陈磊,陈国兴.近断层强地震动下双层竖向重叠地铁隧道的地震反应[J].防灾减灾工程学报,2008,28(4):399-408.CHEN Lei,CHEN Guo xing.Seismic response of vertically double layered metro tunnels under near fault strong ground motion[J].Journal of Di saster Prevention and Mitigation Engineering,2008,28(4):399-408.
[11]潘建杰,王步云.双层隧道地震反应分析[J].工程设计与建设,2005,37(5):17-20.PAN Jian jie,WANG Bu yun.Seismic response analysis for double layer tunnel[J].Engineering Design and Construction,2005,37(5):17-20.
[12]戚乐磊,王步云,梁若筠,等.双层隧道内力分析[J].甘肃工业大学学报,2002,28(1):95-98.QI Le lei,WANG Bu yun,LIANG Ruo jun,et al.Analysis of internal force of double decked tunnel[J].Journal of Gansu University of Technology,2002,28(1):95-98.
[13]熊良宵,李天斌,刘勇.隧道地震响应数值模拟研究[J].地质力学学报,2007,13(3):255-260.XIONG Liang xiao,LI Tian bin,LIU Yong.Numerical simulation of seismic response at the entrance of the unsymmetrical loading tunnel[J].Journal of Geomechanics,2007,13(3):255-260.
[14]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005:18-21.
[15]胡聿贤.地震工程学[M].北京:地震出版社,2006:91-104.
[16]李海波,刘博,吕涛,等.一种简单的岩体地下洞室地震安全评价方法[J].岩土力学,2009,30(7):1873-1882.LI Hai bo,LIU Bo,LüTao,et al.A simple safety assessment method for underground engineering in rock under seismic loading[J].Rock andSoil Mechanics,2009,30(7):1873-1882.
[17]焦冬雪,刘元雪,陆新.单洞双层隧道围岩力学特性分析[J].地下空间与工程学报,2009,5(增1):1388-1392.JIAO Dong xue,LIU Yuan xue,LU Xin.The mechanical property of surrounding rock about single cavern and double layer tunnel[J].ChineseJournal of Underground Space and Engineering,2009,5(Supp.1):1388-1392.
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