穿越逆冲断层的埋地管道非线性反应分析
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摘要
穿越逆冲断层的埋地管道在地震作用下,容易发生局部屈曲或整体失稳等形式的破坏,研究逆冲断层作用下的埋地管道地震反应规律,对管道抗震设计及施工等具有重要的意义。本文将埋地管线及周围土体从半无限地球介质中取出,分别以空间薄壳单元和实体单元进行离散,采用非线性接触力学方法模拟管、土之间的滑移、分离及闭合现象;采用线性位移加载模拟断层的错动,考虑了系统初始应力状态的影响,对土体未开裂前的管土相互作用系统进行了拟静力数值分析;分析了位错量、土体刚度、埋设深度、径厚比及跨越角度对埋地管道反应的影响,得出了一些有益的结论。
Buried pipelines crossing thrust fault are prone to cause local or overall buckling or other forms of damages during earthquake.So it′s important for seismic design and constructions of buried pipelines to study the seismic response regulars of buried pipelines crossing thrust fault.The buried pipeline is separated from the semi-infinite earth medium together with the surrounding soil,and a three-dimensional finite element analysis model of pipeline-soil system is established using nonlinear contact treatment method.The pipeline is considered as the space thin-shell elements,while the surrounding soil is regarded as solid elements.The nonlinear contact elements are adopted to simulate the slip,the separation and the closure phenomena between the pipe and the soil.The fault movement is achieved by loading the linear displacements,and the initial stress condition of the system is considered at the same time.The pipeline-soil interaction system which presumes the surrounding soil does not crack is numerical analyzed with pseudo-static method.Some important influential factors,such as fault displacement,soil stiffness,buried depth,ratio of diameter to wall-thickness and crossing angle,are conducted.And some helpful conclusions are drawn.
Buried pipelines crossing thrust fault are prone to cause local or overall buckling or other forms of damages during earthquake.So it′s important for seismic design and constructions of buried pipelines to study the seismic response regulars of buried pipelines crossing thrust fault.The buried pipeline is separated from the semi-infinite earth medium together with the surrounding soil,and a three-dimensional finite element analysis model of pipeline-soil system is established using nonlinear contact treatment method.The pipeline is considered as the space thin-shell elements,while the surrounding soil is regarded as solid elements.The nonlinear contact elements are adopted to simulate the slip,the separation and the closure phenomena between the pipe and the soil.The fault movement is achieved by loading the linear displacements,and the initial stress condition of the system is considered at the same time.The pipeline-soil interaction system which presumes the surrounding soil does not crack is numerical analyzed with pseudo-static method.Some important influential factors,such as fault displacement,soil stiffness,buried depth,ratio of diameter to wall-thickness and crossing angle,are conducted.And some helpful conclusions are drawn.
引文
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[7]冯启民,赵林.跨越断层埋地管道屈曲分析[J].地震工程与工程振动,2001,21(4):81-87.Feng Q M,Zhao L.Buckling analysis of buried pipessubjected to fault movements[J].Earthquake Engi-neering and Engineering Vibration,2001,21(4):81-87.
[8]朱庆杰,陈艳华,蒋录珍.场地和断层对埋地管道破坏的影响分析[J].岩土力学,2008,29(9):2392-2396.Zhu Q J,Chen Y H,Jiang L Z.Influences of site andfaults on damage of buried pipelines[J].Rock and SoilMechanics,2008,29(9):2392-2396.
[9]王滨,李昕,周晶.地震断层作用下的埋地管道等效分析模型[J].防灾减灾工程学报,2009,29(1):44-60.Wang B,Li X,Zhou J.An equivalent analyticalmodel of buried pipelines subject to fault movement[J].Journal of Disaster Prevention and MitigationEngineering,2009,29(1):44-60.
[10]林均岐,胡明.跨越断层地下管道地震反应研究[J].地震工程与工程振动,2007,27(5):129-133.Lin J Q,Hu M Y.Seismic responses of buriedpipeline crossing fault[J].Earthquake Engineeringand Engineering Vibration,2007,27(5):129-133.
[2]Kennedy R P,Darrow A W,Williamson R A.Faultmovement effects on buried oil pipeline[J].Journal ofthe Transportation Engineering Division,ASCE,1977,103(5):617-633.
[3]Wang L R L,Yeh Y H.A refined seismic analysisand design of buried pipeline for fault movement[J].International Journal of Earthquake Engineering andStructure Dynamics,1985,13(1):75-96.
[4]O′Rourke M J,Hmadi K E.Analysis of continuousburied pipelines for seismic wave effects[J].Interna-tional Journal of Earthquake Engineering and Struc-ture Dynamics,1988,16(2):917-929.
[5]Liang J W.Dynamic response of pipelines laidthrough alluvial valley[J].Transactions of TianjinUniversity,1995,1(1):89-92.
[6]刘爱文,胡聿贤,赵凤新.地震断层作用下埋地管线壳有限元分析的等效边界方法[J].地震学报,2004,26(增):143-149.Liu A W,Hu Y X,Zhao F X.An equivalent-bounda-ry method for the shell analysis of buried pipelines un-der fault movement[J].Acta Seismologica Sinica,2004,26(S):143-149.
[7]冯启民,赵林.跨越断层埋地管道屈曲分析[J].地震工程与工程振动,2001,21(4):81-87.Feng Q M,Zhao L.Buckling analysis of buried pipessubjected to fault movements[J].Earthquake Engi-neering and Engineering Vibration,2001,21(4):81-87.
[8]朱庆杰,陈艳华,蒋录珍.场地和断层对埋地管道破坏的影响分析[J].岩土力学,2008,29(9):2392-2396.Zhu Q J,Chen Y H,Jiang L Z.Influences of site andfaults on damage of buried pipelines[J].Rock and SoilMechanics,2008,29(9):2392-2396.
[9]王滨,李昕,周晶.地震断层作用下的埋地管道等效分析模型[J].防灾减灾工程学报,2009,29(1):44-60.Wang B,Li X,Zhou J.An equivalent analyticalmodel of buried pipelines subject to fault movement[J].Journal of Disaster Prevention and MitigationEngineering,2009,29(1):44-60.
[10]林均岐,胡明.跨越断层地下管道地震反应研究[J].地震工程与工程振动,2007,27(5):129-133.Lin J Q,Hu M Y.Seismic responses of buriedpipeline crossing fault[J].Earthquake Engineeringand Engineering Vibration,2007,27(5):129-133.
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