地震载荷作用下液化土中输流管道动态响应研究
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摘要
将地震载荷作用下的液化区埋土管道模拟成受到液化土弹性力作用下的直梁模型,将管道两端约束等效化为两端弹性支承,考虑管-土间的相互作用和管内流体与管道之间的流固耦合作用,采用梁模型一般振型函数实施模态叠加法对液化区埋地管道进行地震响应的动态分析,探讨了管道、流体和液化土参数对管道上浮反应的影响。数值仿真结果表明:埋土管道在地震作用下砂土液化时的上浮位移,随液化区管道长度、管外径、管内流体流速、液化砂土的密度和管截面受到的轴向压应力的增大而增大,随管内输送流体的密度、液化土的相对弹性系数、管材的粘弹性系数和管截面受到的轴向拉应力的增大而减小,地震加速度幅值对管道上浮位移的影响相对较小。
The underground pipeline in liquefaction soil under seismic force was simplified as a simple beam with elastic supports on two ends. Considering the interaction of buried pipeline-soil and fluid-structures, the mode superposition method was used to analyze the dynamic response under seismic loading of underground pipeline. The influence of the parameters of the pipeline, flowing fluid and liquefied soil on floatation response were under discussion. The numerical results show that the floatation displacement of the pipeline buried with soil liquefied under the action of seismic loading is proportional to pipe length and diameter, fluid flowrate inside pipeline, the density of liquefaction soil and axial sectional pressed force of pipe as well, but is proportional conversely to the fluid density inside pipeline, relative elastic coefficient of liquefaction soil, visco-elastic coefficient of pipe and the axial sectional drawn force. The effect of seismic acceleration amplitude on the floatation of pipeline is a trace that can be ignored in the floatation response analysis.
The underground pipeline in liquefaction soil under seismic force was simplified as a simple beam with elastic supports on two ends. Considering the interaction of buried pipeline-soil and fluid-structures, the mode superposition method was used to analyze the dynamic response under seismic loading of underground pipeline. The influence of the parameters of the pipeline, flowing fluid and liquefied soil on floatation response were under discussion. The numerical results show that the floatation displacement of the pipeline buried with soil liquefied under the action of seismic loading is proportional to pipe length and diameter, fluid flowrate inside pipeline, the density of liquefaction soil and axial sectional pressed force of pipe as well, but is proportional conversely to the fluid density inside pipeline, relative elastic coefficient of liquefaction soil, visco-elastic coefficient of pipe and the axial sectional drawn force. The effect of seismic acceleration amplitude on the floatation of pipeline is a trace that can be ignored in the floatation response analysis.
引文
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[3]林均岐,李祚华,胡明袆.液化土中管道上浮反应的影响因素研究[J].地震工程与工程振动,2005,25(4):130―134.Lin Junqi,Li Zuohua,Hu Mingyi.Study on influential factors of buried pipeline floatation response due to soil liquefaction[J].Earthquake Engineering and Engineering Vibration,2005,25(4):130―134.(in Chinese)
[4]邹德高,孔宪京.地震时饱和砂土地基中管线上浮机理及抗震措施试验研究[J].岩土工程学报,2002,24(3):323―326.Zou Degao,Kong Xianjing.Experimental study on the uplift behavior of pipeline in saturated sand foundation and earthquake resistant measures during an earthquake[J].Chinese Journal of Geotechnical Engineering,2002,24(3):323―326.(in Chinese)
[5]艾晓秋,李杰.地下管线的有效应力地震反应分析[J].防灾减灾工程学报,2005,25(1):1―7.Ai Xiaoqiu,Li Jie.Analysis of seismic response of underground pipelines in terms of effective stress[J].Journal of Disaster Prevention and Mitigation Engineering,2005,25(1):1―7.(in Chinese)
[6]张陵,郭惠勇,孙清.长输管道抗震研究的进展与趋向[J].西安交通大学学报,2001,35(2):203―209.Zhang Ling,Guo Huiyong,Sun Qing.Advances andtrendsin aseismic research of long distance transportation pipe[J].Journal of Xi’an Jiaotong University,2001,35(2):203―209.(in Chinese)
[7]李昕,周晶,陈健云.考虑土体非线性特性的直埋管道-土体系统的动力反应分析[J].计算力学学报,2001,18(2):167―172.Li Xin,Zhou Jing,Chen Jianyun.Dynamic response on straight buried pipeline considering non-linear soil model[J].Chinese Journal of Computational Mechanics,2001,18(2):167―172.(in Chinese)
[8]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 determination of interaction between buried pipe and soil[J].Rock and Soil Mechanics,2004,25(5):728―731.(in Chinese)
[9]Paidoussis M P,Issid N T.Study on dynamic response of conveying water piping system[J].Journal of Sound and Vibration,1974,33(2):267―294.
[10]谭平.天然气管道系统地震响应分析[J].天然气工业,2005,25(7):99―101.Tan Ping.Analysis of seismic response for gas pipeline system[J].Natural Gas Industry,2005,25(7):99―101.(in Chinese)
[11]刘延柱,陈文良,陈立群.振动力学[M].北京:高等教育出版社,1998.131―133.Liu Yanzhu,Chen Wenliang,Chen Liqun.Mechanic of vibrations[M].Beijing:Higher Education Press,1998.131―133.(in Chinese)
[12]Paidoussis M P,Li G X,Rand R H.Chaotic motions of a constrained pipe conveying fluid:Comparison between simulation,analysis and experiment[J].ASME Journal of Applied Mechanics,1991,58(3):559―565.
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