埋地管线-土体相互作用分析计算区域的选取
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摘要
将埋地管线及周围土体从半无限地球介质中共同取出,建立了管土相互作用分析模型,采用有限元技术分析地面永久变形下埋地管线与周围土体的反应和相互影响,以确定有限元分析中计算区域的范围.管道及其周围土体分别以空间薄壳单元和实体单元进行离散,采用非线性接触单元模拟管土之间的滑移、分离及闭合现象.考虑了初始应力场的影响,对有限元模型的有效计算区域问题进行了数值分析,给出了管土界面分离及滑移情况,得到了有效计算区域与位错量、管径、埋深及土体刚度的关系.
The buried pipeline and the soil around were separated from the semi-infinite earth medium,and a three-dimensional finite element analysis model of pipeline-soil system was established to determine the interaction between pipeline and soil around under ground permanent deformation,then to evaluate the calculation area of the system.Finite element technology was introduced to analyze the responses and the interactions of the pipeline-soil system under ground permanent deformation.The pipeline was considered as the space thin-shell element and the surrounding soil was regarded as solid element to be discreted,respectively.And nonlinear contact elements were adopted to simulate slip,isolation and closing phenomena between the pipe and the soil.The initial stress field in the pipeline-soil system was also estimated for the analysis.The effective calculation area of the finite element model was evaluated,and relative separation and slippage performances on the interface between the pipe and the soil were investigated.The relationships among effective calculation area and fault displacement,pipe diameter,buried depth of pipe,and soil stiffness were determined.
The buried pipeline and the soil around were separated from the semi-infinite earth medium,and a three-dimensional finite element analysis model of pipeline-soil system was established to determine the interaction between pipeline and soil around under ground permanent deformation,then to evaluate the calculation area of the system.Finite element technology was introduced to analyze the responses and the interactions of the pipeline-soil system under ground permanent deformation.The pipeline was considered as the space thin-shell element and the surrounding soil was regarded as solid element to be discreted,respectively.And nonlinear contact elements were adopted to simulate slip,isolation and closing phenomena between the pipe and the soil.The initial stress field in the pipeline-soil system was also estimated for the analysis.The effective calculation area of the finite element model was evaluated,and relative separation and slippage performances on the interface between the pipe and the soil were investigated.The relationships among effective calculation area and fault displacement,pipe diameter,buried depth of pipe,and soil stiffness were determined.
引文
[1]Newmark N M,Hall W J.Pipeline design to resist large faultdisplacement[C]∥Proceedings of U S NCEE.Ann Arbor:University of Michigan,1975:416-425.
[2]Kennedy R P,Darrow A W,Williamson R A.Fault movementeffects on buried oil pipeline[J].Journal of the TransportationEngineering Division,ASCE,1977,103(5):617-633.
[3]Wang L R L,Yeh Y H.Arefined seismic analysis and design ofburied pipeline for fault movement[J].International Journal ofEarthquake Engineering and Structure Dynamics,1985,13:75-96.
[4]O′Rourke MJ,Hmadi K E.Analysis of continuous buried pipe-lines for seismic wave effects[J].International Journal of Earth-quake Engineering and Structure Dynamics,1988,16:917-929.
[5]Liang J W.Dynamic response of pipelines laid through alluvialvalley[J].Transactions of Tianjin University,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(增刊):143-149.Liu Aiwen,Hu Yuxian,Zhao Fengxin.An equivalent-boundarymethod for the shell analysis of buried pipelines under faultmovement[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 Qimin,Zhao Lin.Buckling analysis of buried pipes subjec-ted to fault movements[J].Earthquake Engineering and Engi-neering Vibration,2001,21(4):81-87.
[8]Hindy A,Novak M.Earthquake response of underground pipe-lines[J].Earthquake Engineering and Structure Dynamics,1979,7:451-476.
[9]Dimitrios K,George D.Stress analysis of buried steel pipelinesat strike-slip fault crossings[J].Soil Dynamics and EarthquakeEngineering,2007,27:200-211.
[2]Kennedy R P,Darrow A W,Williamson R A.Fault movementeffects on buried oil pipeline[J].Journal of the TransportationEngineering Division,ASCE,1977,103(5):617-633.
[3]Wang L R L,Yeh Y H.Arefined seismic analysis and design ofburied pipeline for fault movement[J].International Journal ofEarthquake Engineering and Structure Dynamics,1985,13:75-96.
[4]O′Rourke MJ,Hmadi K E.Analysis of continuous buried pipe-lines for seismic wave effects[J].International Journal of Earth-quake Engineering and Structure Dynamics,1988,16:917-929.
[5]Liang J W.Dynamic response of pipelines laid through alluvialvalley[J].Transactions of Tianjin University,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(增刊):143-149.Liu Aiwen,Hu Yuxian,Zhao Fengxin.An equivalent-boundarymethod for the shell analysis of buried pipelines under faultmovement[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 Qimin,Zhao Lin.Buckling analysis of buried pipes subjec-ted to fault movements[J].Earthquake Engineering and Engi-neering Vibration,2001,21(4):81-87.
[8]Hindy A,Novak M.Earthquake response of underground pipe-lines[J].Earthquake Engineering and Structure Dynamics,1979,7:451-476.
[9]Dimitrios K,George D.Stress analysis of buried steel pipelinesat strike-slip fault crossings[J].Soil Dynamics and EarthquakeEngineering,2007,27:200-211.
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