穿越断层埋地管线反应数值模拟——建模中的几个具体问题
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摘要
讨论了地震断层作用下埋地管道有限元分析模型的几个具体问题。建议将穿越断层的埋地管道反应数值模拟问题分解为两个步骤,它们分别是基岩运动作用下覆盖土层的反应分析(步骤A)和断层引起的地面永久变形作用下埋地管道的反应分析(步骤B)。在后者的分析中,取出埋地管道与周围土体建立管土体系模型,并将管道和土体分别模拟为薄壁型空间结构和实体均匀介质,管道、土体及管土间的接触均采用有限元技术建模和分析。对于管土体系有限元模型中涉及到的一些问题,如力学分析模式、计算域的确定、断层运动的施加、管道与土体本构模型的选择、管土接触问题的处理、管土体系初始应力场的确定、管道破坏模式及判断准则等进行了简要分析和讨论。
In this paper,some problems in modeling of finite element analysis for buried pipelines under earthquake fault-induced ground deformation were discussed.It was suggested that the numerical response analysis of the pipelines passing through active fault is decomposed into two steps,they are responses analysis issue of overlaid soil due to bedrock movement(Step A) and responses analysis issue of buried pipelines under fault-induced ground deformation(Step B).In Step B,a pipe-soil system model was established with the buried pipeline and surrounding soil taken out together from the semi-infinite earth-space,and the pipe and soil were simulated as the thin-wall space structure and the uniform solid medium,respectively.The pipe,the soil and the contact behavior between the pipe and soil were all built up and analyzed with finite element technology.Some problems involved in the pipe-soil system model,such as mechanics analysis mode,determination of the calculation domain,action of fault movement,constitutive model selection of pipe and soil,initial stress field of pipe-soil system,failure mode and criterion of pipe,and so on,were analyzed and discussed preliminarily.
In this paper,some problems in modeling of finite element analysis for buried pipelines under earthquake fault-induced ground deformation were discussed.It was suggested that the numerical response analysis of the pipelines passing through active fault is decomposed into two steps,they are responses analysis issue of overlaid soil due to bedrock movement(Step A) and responses analysis issue of buried pipelines under fault-induced ground deformation(Step B).In Step B,a pipe-soil system model was established with the buried pipeline and surrounding soil taken out together from the semi-infinite earth-space,and the pipe and soil were simulated as the thin-wall space structure and the uniform solid medium,respectively.The pipe,the soil and the contact behavior between the pipe and soil were all built up and analyzed with finite element technology.Some problems involved in the pipe-soil system model,such as mechanics analysis mode,determination of the calculation domain,action of fault movement,constitutive model selection of pipe and soil,initial stress field of pipe-soil system,failure mode and criterion of pipe,and so on,were analyzed and discussed preliminarily.
引文
[1]Newmark N M,Hall W J.Pipeline design to resist large fault displacement[C]//Proceedings of US National Conference on Earthquake Engi-neering.Ann Arbor,1975:416-425.
[2]Kennedy R,Chow A W,Williamson R A.Fault movement effects on buried oil pipeline[J].Journal of Transportation Engineering,ASCE,TE5,1977:617-633.
[3]Kennedy R,Darrow A C,Short S A.Seismic design of oil pipeline systems[J].Journal of Technical Councils,ASCE,1979:119-134.
[4]Wang L R L,Yeh Y H.A refined seismic analysis and design of buried pipeline for fault movement[J].Earthquake Engineering&StructuralDynamics,1985,13(1):75-96.
[5]Wang LR L,Wang LJ.Parametric study of buried pipelines due to large fault movements[C]//Proceedings of3rd China-Japan-US Trilater-al Symposium on Lifeline Earthquake Engineering.Kunming,China,1998:165-172.
[6]郭恩栋,冯启民.跨断层埋地钢管道抗震计算方法研究[J].地震工程与工程振动,1999,19(4):43-47.
[7]刘爱文,张素灵,胡聿贤,等.地震断层作用下埋地管线的反应分析[J].地震工程与工程振动,2002,22(2):22-27.
[8]Karamitros D K,Bouckovalas G D,Kouretzis G P.Stress analysis of buried steel pipelines at strike-slip fault crossings[J].Soil Dynamics andEarthquake Engineering,2007,27:200-211.
[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):44-50.
[10]Takada S,Liang J W,Li TY.Shell-model response of buried pipelines to large fault movements[J].Journal of Structural Engineering,JSCE,1998,44:1637-1646.
[11]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):51-57.
[12]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):80-87.
[13]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.
[14]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.
[15]金浏,李鸿晶,姚保华.埋地管线-土体相互作用分析计算区域的选取[J].南京工业大学学报(自然科学版),2009,31(3):37-41.
[16]金浏.断层引起的地面大变形下埋地管线非线性反应分析[D].南京:南京工业大学,2009.
[2]Kennedy R,Chow A W,Williamson R A.Fault movement effects on buried oil pipeline[J].Journal of Transportation Engineering,ASCE,TE5,1977:617-633.
[3]Kennedy R,Darrow A C,Short S A.Seismic design of oil pipeline systems[J].Journal of Technical Councils,ASCE,1979:119-134.
[4]Wang L R L,Yeh Y H.A refined seismic analysis and design of buried pipeline for fault movement[J].Earthquake Engineering&StructuralDynamics,1985,13(1):75-96.
[5]Wang LR L,Wang LJ.Parametric study of buried pipelines due to large fault movements[C]//Proceedings of3rd China-Japan-US Trilater-al Symposium on Lifeline Earthquake Engineering.Kunming,China,1998:165-172.
[6]郭恩栋,冯启民.跨断层埋地钢管道抗震计算方法研究[J].地震工程与工程振动,1999,19(4):43-47.
[7]刘爱文,张素灵,胡聿贤,等.地震断层作用下埋地管线的反应分析[J].地震工程与工程振动,2002,22(2):22-27.
[8]Karamitros D K,Bouckovalas G D,Kouretzis G P.Stress analysis of buried steel pipelines at strike-slip fault crossings[J].Soil Dynamics andEarthquake Engineering,2007,27:200-211.
[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):44-50.
[10]Takada S,Liang J W,Li TY.Shell-model response of buried pipelines to large fault movements[J].Journal of Structural Engineering,JSCE,1998,44:1637-1646.
[11]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):51-57.
[12]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):80-87.
[13]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.
[14]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.
[15]金浏,李鸿晶,姚保华.埋地管线-土体相互作用分析计算区域的选取[J].南京工业大学学报(自然科学版),2009,31(3):37-41.
[16]金浏.断层引起的地面大变形下埋地管线非线性反应分析[D].南京:南京工业大学,2009.
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