考虑人工边界的海底管线地震应力分析
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摘要
海床动力响应分析一般将管线假定为刚性,没有考虑地震荷载作用下海床边界的等效处理,亦不能合理地考虑海床与管线的相互作用效应.基于Biot动力固结理论建立了海床-管线相互作用的计算模型,利用粘弹性人工边界,以大型有限元软件ADINA为平台对El-Centro地震波作用下的海底管线的动力响应进行分析,重点讨论了成层海床土对海床中孔隙水压力和海底管线内应力的影响.结果表明:海床土性的变化对海底管线的内应力影响不大,而对海底管线周围孔隙水压力的影响很重要.
In most of the previous investigations for dynamic response of seabed,the pipeline is supposed as to be rigid and generally the interaction between seabed and pipeline is overlooked.The equivalent disposal of seabed boundary also has not been taken into consideration.Based on the Biot′s theory of consolidation,the model of the seabed-pipeline interaction is established using viscous-elastic artificial boundary.The distribution of the pore pressure in seabed soil and the dynamic response of submarine pipeline are studied under El-Centro seismic wave by virtue of the general-purpose FEM analysis package ADINA.The effects of two-layered seabed properties on the seismic-induced pore pressure and internal stresses are discussed emphatically.It is shown that the influences of seabed soil properties on internal stresses of pipeline are slight,but those on pore pressure around pipeline are remarkable.
In most of the previous investigations for dynamic response of seabed,the pipeline is supposed as to be rigid and generally the interaction between seabed and pipeline is overlooked.The equivalent disposal of seabed boundary also has not been taken into consideration.Based on the Biot′s theory of consolidation,the model of the seabed-pipeline interaction is established using viscous-elastic artificial boundary.The distribution of the pore pressure in seabed soil and the dynamic response of submarine pipeline are studied under El-Centro seismic wave by virtue of the general-purpose FEM analysis package ADINA.The effects of two-layered seabed properties on the seismic-induced pore pressure and internal stresses are discussed emphatically.It is shown that the influences of seabed soil properties on internal stresses of pipeline are slight,but those on pore pressure around pipeline are remarkable.
引文
[1]孙政策,段梦兰,张文,等.海底管线抗震设计的极限地震应力计算法[J].应用力学学报,2006,23(3):440-446
[2]TURCOTTE B R,LIU P L F,KULHAWY F H.Laboratory evaluation of wave tank parameters forwave-sediment interaction[R]//Joseph H.DeFreeHydraulic Laboratory Report 84-1.New York:Cornell University,1984
[3]WANG X,JENG D S,LIN Y S.Effects of a coverlayer on wave-induced pore pressure around a buriedpipe in an anisotropic seabed[J].Ocean Engineering,2000,27:823-839
[4]曲鹏,栾茂田,郭莹,等.波浪作用下饱和海床-管线动力相互作用的有限元分析[C]//第七届全国土动力学学术会议论文集.北京:清华大学出版社,2006:446-453
[5]周晶,李昕,刘亚坤,等.海底悬跨管道动力响应的试验研究和数值模拟[J].工程力学,2003,20(2):21-25
[6]邹德高,孔宪京,娄树莲,等.饱和砂土地基中地下管线的振动台试验数值模拟分析[J].水利学报,2004,20(12):112-119
[7]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64
[8]LYSMER J,KUHLEMEYER R L.Finite dynamicmodel for infinite media[J].Journal of EngineeringMechanics Division,ASCE,1969,95(4):859-877
[9]邱流潮,金峰.地震分析中人工边界处理与地震动输入方法研究[J].岩土力学,2006,27(9):1501-1504
[10]GUDDATI M N,TASSOULAS J L.Characteristicsmethods for transient analysis of wave propagationin unbounded media[J].Computer Methods inApplied Mechanics and Engineering,1998,164(1-2):187-206
[11]PICKERING D J.Anisotropic elastic parameters forsoil[J].Géotechnique,1970,20(3):271-276
[2]TURCOTTE B R,LIU P L F,KULHAWY F H.Laboratory evaluation of wave tank parameters forwave-sediment interaction[R]//Joseph H.DeFreeHydraulic Laboratory Report 84-1.New York:Cornell University,1984
[3]WANG X,JENG D S,LIN Y S.Effects of a coverlayer on wave-induced pore pressure around a buriedpipe in an anisotropic seabed[J].Ocean Engineering,2000,27:823-839
[4]曲鹏,栾茂田,郭莹,等.波浪作用下饱和海床-管线动力相互作用的有限元分析[C]//第七届全国土动力学学术会议论文集.北京:清华大学出版社,2006:446-453
[5]周晶,李昕,刘亚坤,等.海底悬跨管道动力响应的试验研究和数值模拟[J].工程力学,2003,20(2):21-25
[6]邹德高,孔宪京,娄树莲,等.饱和砂土地基中地下管线的振动台试验数值模拟分析[J].水利学报,2004,20(12):112-119
[7]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64
[8]LYSMER J,KUHLEMEYER R L.Finite dynamicmodel for infinite media[J].Journal of EngineeringMechanics Division,ASCE,1969,95(4):859-877
[9]邱流潮,金峰.地震分析中人工边界处理与地震动输入方法研究[J].岩土力学,2006,27(9):1501-1504
[10]GUDDATI M N,TASSOULAS J L.Characteristicsmethods for transient analysis of wave propagationin unbounded media[J].Computer Methods inApplied Mechanics and Engineering,1998,164(1-2):187-206
[11]PICKERING D J.Anisotropic elastic parameters forsoil[J].Géotechnique,1970,20(3):271-276
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