管道穿越地震断层管土耦合大变形壳模型的应变响应规律研究
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摘要
考虑薄壳大变形和管土耦合相互作用,针对地震断层两侧场地相同和场地相异及中间含有破碎带等不同条件建立壳单元有限元分析模型。采用大变形壳有限元方法分析X80钢大口径油气管道穿越地震断层的应变响应。计算中考虑管道与土体的非线性,系统分析相应场地条件下管道壁厚、埋深、破碎带宽度、位错量、管道与断层管道交角等因素对管道应变响应的影响规律和变化曲线。比较以上不同参数变化条件下管道地震应变反应特征,分析各影响因素的灵敏度大小并总结其变化规律。研究结果表明:断层破碎带越宽,地震断层作用下管道产生的轴向变形越小,对管道的抗震越有利。同时得出,当断层两侧土体性质相异时,大口径油气管道更易发生较大的变形,其最大应变发生部位在管道与断层较硬一侧交汇处,应变响应也更加剧烈。
A shell finite element model is set up on the basis of pipeline-soil coupling and large deformation of thin shell pipelines crossing faults with identical or different soil conditions on both sides,and the fractured zones in the middle.The strain response of X80 large diameter oil-gas pipeline crossing faults is analyzed by large deformation shell finite element method.Considering material nonlinearity of both pipeline and soil,the influence and variation of pipeline strain response are studied with influence factors such as wall thickness,buried depth,fault fracture zone width,slip magnitude,intersection angle of pipeline and fault.Pipeline strain response characteristics are obtained for different parameter variations.Sensitivity of the influence factors is compared,and the variation is summarized.The study indicates that pipeline axial deformation decreases with the increase of fault fracture zone width under earthquake.The deformation and strain response of large diameter pipeline tend to be more significant for different soil conditions of faults at both sides.The position of maximum strain is located at intersection between pipeline and the harder side of fault.
A shell finite element model is set up on the basis of pipeline-soil coupling and large deformation of thin shell pipelines crossing faults with identical or different soil conditions on both sides,and the fractured zones in the middle.The strain response of X80 large diameter oil-gas pipeline crossing faults is analyzed by large deformation shell finite element method.Considering material nonlinearity of both pipeline and soil,the influence and variation of pipeline strain response are studied with influence factors such as wall thickness,buried depth,fault fracture zone width,slip magnitude,intersection angle of pipeline and fault.Pipeline strain response characteristics are obtained for different parameter variations.Sensitivity of the influence factors is compared,and the variation is summarized.The study indicates that pipeline axial deformation decreases with the increase of fault fracture zone width under earthquake.The deformation and strain response of large diameter pipeline tend to be more significant for different soil conditions of faults at both sides.The position of maximum strain is located at intersection between pipeline and the harder side of fault.
引文
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[2]刘全林,杨敏.地埋管与土相互作用分析模型及其参数确定[J].岩土力学,2004,25(5):728-731(Liu Quanlin,Yang Min.Analytical model and parameters determinationof interaction between buried pipe and soil[J].Rock andSoil Mechanics,2004,25(5):728-731(in Chinese))
[3]Abdoun TH,Ha D,O’Rourke MJ,et al.Factors influenc-ing the behavior of buried pipelines subjected to earthquakefaulting[J].Soil Dynamics and Earthquake Engineering,2009,29(3):415-427
[4]朱庆杰,刘英利,蒋录珍,等.管土摩擦和管径对埋地管道破坏的影响分析[J].地震工程与工程振动,2006,26(3):197-199(Zhu Qingjie,Liu Yingli,Jiang Luzhen,etal.Analysis of buried pipeline damage affected by pipe-soilfriction and pipe radius[J].Earthquake Engineering andEngineering Vibration,2006,26(3):197-199(inChinese))
[5]Choo Y W,Abdoun T H,O’Rourke M J,et al.Re-mediation for buried pipeline systems under permanentground deformation[J].Soil Dynamics and EarthquakeEngineering,2007,27(12):1043-1055
[6]赵林,冯启民.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57(Zhao Lin,FengQimin.Research on methods for establishing FEMmodel ofburied pipelines[J].Earthquake Engineering andEngineering Vibration,2001,21(2):53-57(in Chinese))
[7]刘爱文,胡聿贤,赵凤新,等.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(S1):141-147(Liu Aiwen,Hu Yuxian,Zhao Fengxin,etal.An equivalent-boundary method for the shell analysis ofburied pipelines under fault movement[J].ActaSeismologica Sinica,2004,26(S1):141-147(in Chinese))
[8]Karamitros D K,Bouckovalas G D,Kouretzis G P.Stressanalysis of buried steel pipelines at strike-slip faultcrossings[J].Soil Dynamics and Earthquake Engineering,2007,27(3):200-211
[9]Kershenbaum N Y,Mebarkia S A,Choi H S.Behavior ofmarine pipelines under seismic faults[J].OceanEngineering,2000,27(5):473-487
[10]刘全林,杨敏.地埋薄壁管道与土相互作用的三维理论分析[J].土木工程学报,2008,41(4):61-64(LiuQuanlin,Yang Min.3-D theoretical analysis on theinteraction between buried thin-wall pipe and soil[J].China Civil Engineering Journal,2008,41(4):61-64(inChinese))
[11]刘爱文,胡聿贤,李小军,等.大口径埋地钢管在地震断层作用下破坏模式的研究[J].工程力学,2005,22(3):82-87(Liu Aiwen,Hu Yuxian,Li Xiaojun,et al.Damagebehavior of large-diameter buried steel pipelines under faultmovements[J].Engineering Mechanics,2005,22(3):82-87(in Chinese))
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