海底管线抗震设计的极限地震应力计算法
|
摘要
针对现用海底管线地震应力计算时存在的计算应力过大、管线几何参数和埋设深度对计算结果几乎没有影响等问题,在考虑了海底管线实际埋设环境的基础上,通过理论分析,给出了考虑地震时管线周围约束土壤进入塑性滑移状态后的极限地震应力计算方法,来计算海底埋设管线在地震作用下所产生的最大地震应力。用该新方法分析了一实际管线工程的地震应力,并通过与现用方法计算结果的比较,证明该方法克服了现用设计方法仅考虑管土之间为弹性约束、管线几何尺寸对抗震设计影响很小等问题,有效反映了实际铺设环境对海底管线地震应力的作用。本文应用极限地震应力计算法,结合工程实例计算,进一步明确了管线几何参数和埋设深度对极限地震应力的影响规律,为准确计算海底管线的地震应力、制定海底管线抗震规范、进行已服役海底管线的地震风险评估和寿命预测奠定了基础。
Based on the plastic slippage theory for soil-pipeline interaction,a method for evaluating the ultimate seismic stress is developed,where the interactions of seismic stress with the geometric parameters and the buried depth of pipelines are considered. An engineering case demonstrates that increasing wall thickness of the pipeline and decreasing the buried depth enable to reduce the ultimate seismic stress,enlarging the outer diameter of pipeline does not aparently lower the stress due to the enhanced soil constraint.
Based on the plastic slippage theory for soil-pipeline interaction,a method for evaluating the ultimate seismic stress is developed,where the interactions of seismic stress with the geometric parameters and the buried depth of pipelines are considered. An engineering case demonstrates that increasing wall thickness of the pipeline and decreasing the buried depth enable to reduce the ultimate seismic stress,enlarging the outer diameter of pipeline does not aparently lower the stress due to the enhanced soil constraint.
引文
[1]周延东,刘日柱.我国海底管道的发展状况与前景[J].中国海上油气(工程),1998,10(4):1-5.
[2]许东禹,刘锡清,等.中国近海地质[M].北京:地震出版社,1997.
[3]Datta K T,Mashaly E A.Pipeline response to randomground motion[J].Earthquake Engineering and Structural Dynamics,1986,14:559-572.
[4]Romagnoli R,Varvelli R.An integrated seismic response a-nalysis of offshore Pipeline-sea Floor Systems[C]//7th Inter-national Conference on Offshore Mechanics and Arctic Engi-neering,1988:139-145.
[5]Figarov N G,Kamyshev A M.Seismic stability of offshore pipelines[C]//6thInternational offshore and polar engineering conference,1996:355-364.
[6]Kershenbaum N Y,Choi HS,Mebarkia S A.Subsea pipeline behavior under seismic i mpact[C]//8th international offshore and polar engineering conference,1998,2:86-93.
[7]Paulin M L,Phillips R,et al.Establishment of a full-scale pipeline/soil interaction test facility and results from lateral and axial investigations in sand[C]//Offshore Mechanics and Arctic Engineering Conference,1997,5:139-146.
[8]Verley R L P,Sotberg T.Asoil resistance model for pipeline placed on sandy soils[C]//Offshore Mechanics and Arctic En-gineering Conference,1992,5:123-131.
[9]王金英,赵冬岩.渤海海底管线工程的现状和问题[J].中国海上油田(工程),1992,4(1):1-6.
[10]孙政策,段梦兰,张文,等.现用海底管线抗震设计方法存在的问题及解决办法[J].振动工程学报,2004,17(3):263-268.
[11]孙政策,段梦兰,张文,等.地震波条件下海底管线抗震设计方法的研究[J].石油学报,2005,26(2):115-118.
[12]勃洛达夫金ΠΠ.埋设管线[M].冯亮,译.北京:石油工业出版社,1988.
[13]渤海工程设计公司.埋设管线的抗震设计法[S]//石油管道技术标准,1987.
[14]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.
[2]许东禹,刘锡清,等.中国近海地质[M].北京:地震出版社,1997.
[3]Datta K T,Mashaly E A.Pipeline response to randomground motion[J].Earthquake Engineering and Structural Dynamics,1986,14:559-572.
[4]Romagnoli R,Varvelli R.An integrated seismic response a-nalysis of offshore Pipeline-sea Floor Systems[C]//7th Inter-national Conference on Offshore Mechanics and Arctic Engi-neering,1988:139-145.
[5]Figarov N G,Kamyshev A M.Seismic stability of offshore pipelines[C]//6thInternational offshore and polar engineering conference,1996:355-364.
[6]Kershenbaum N Y,Choi HS,Mebarkia S A.Subsea pipeline behavior under seismic i mpact[C]//8th international offshore and polar engineering conference,1998,2:86-93.
[7]Paulin M L,Phillips R,et al.Establishment of a full-scale pipeline/soil interaction test facility and results from lateral and axial investigations in sand[C]//Offshore Mechanics and Arctic Engineering Conference,1997,5:139-146.
[8]Verley R L P,Sotberg T.Asoil resistance model for pipeline placed on sandy soils[C]//Offshore Mechanics and Arctic En-gineering Conference,1992,5:123-131.
[9]王金英,赵冬岩.渤海海底管线工程的现状和问题[J].中国海上油田(工程),1992,4(1):1-6.
[10]孙政策,段梦兰,张文,等.现用海底管线抗震设计方法存在的问题及解决办法[J].振动工程学报,2004,17(3):263-268.
[11]孙政策,段梦兰,张文,等.地震波条件下海底管线抗震设计方法的研究[J].石油学报,2005,26(2):115-118.
[12]勃洛达夫金ΠΠ.埋设管线[M].冯亮,译.北京:石油工业出版社,1988.
[13]渤海工程设计公司.埋设管线的抗震设计法[S]//石油管道技术标准,1987.
[14]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心