船舶抛锚对浅水区埋置管道的损伤分析
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摘要
针对浅水区海底埋置管道受船锚冲击后的安全性问题,提出重力式抛锚作业船锚下落速度的计算方法,应用ABAQUS有限元软件建立数值模型,采用CEL方法模拟船舶抛锚撞击埋置管道的动态过程,分析抛锚水深、船锚入泥角度以及管道埋置深度对管道受船锚撞击的损伤影响。结果表明,给定型号的船锚抛锚水深小于船锚达到平衡速度的水深时,海底管道受船锚撞击的损伤程度随抛锚水深增加而增大;船锚入泥角度超过15°后,抛锚撞击管道的损伤程度随入泥角度增大而减小;海底管道受船锚撞击的凹陷深度随管道埋置深度增加成反比关系。
In order to investigate safety of submarine buried pipelines in shallow water,which may be impacted by dropped anchors,a method to calculate the anchor velocity was developed for the anchor dropped in water under gravity. Based on the CEL method,the finite element model was established using ABAQUS to simulate the impact process of anchor on buried pipeline. The damage of the buried pipeline from anchor impacting was analyzed,considering the effect of water depth,the penetration angle of anchor and the buried depth of pipeline. The results showed that for the given anchor the degree of pipeline damage increases with water depth before the anchor reaching the terminal speed. When the anchoring penetration angle is more than15°,the degree of pipeline damage decreases with the increase of penetration angle,and the dent of pipeline has an inverse relationship with the increase of buried depth.
In order to investigate safety of submarine buried pipelines in shallow water,which may be impacted by dropped anchors,a method to calculate the anchor velocity was developed for the anchor dropped in water under gravity. Based on the CEL method,the finite element model was established using ABAQUS to simulate the impact process of anchor on buried pipeline. The damage of the buried pipeline from anchor impacting was analyzed,considering the effect of water depth,the penetration angle of anchor and the buried depth of pipeline. The results showed that for the given anchor the degree of pipeline damage increases with water depth before the anchor reaching the terminal speed. When the anchoring penetration angle is more than15°,the degree of pipeline damage decreases with the increase of penetration angle,and the dent of pipeline has an inverse relationship with the increase of buried depth.
引文
[1]王宏明.船舶抛锚对渤海湾海底管道撞击影响[J].中国航海,2015,38(2):56-59.
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[14]KIM Y H,HOSSAIN M S,WANG D,et al.Numerical investigation of dynamic installation of torpedo anchors in clay[J].Ocean Engineering,2015,108(Supplement S67):820-832.
[15]KO Junyang,JEONG S,LEE J K.Large deformation FE analysis of driven steel pipe piles with soil plugging[J].Computers&Geotechnics,2016,71:82-97.
[16]龚少军,尤庆华.船舶深水抛锚方法分析[J].中国航海,2008,31(2):193-196.
[2]王琮,赵冬岩,罗超.基于概率的锚泊撞击对海底管道埋深影响分析[J].中国造船,2010(A02):89-94.
[3]郭振邦,张群站,徐慧.海底管道关于锚泊作业的定量风险评估[J].天津理工大学学报,2007,23(5):85-88.
[4]丁红岩,乐丛欢,张浦阳.落物撞击作用下海底管道风险评估[J].海洋工程,2010,28(1):25-30.
[5]DNV.DNV-RP-F107.Risk assessment of pipeline protection[S].2010.
[6]娄敏,明海芹.基于LS-DYNA海底悬空管道受坠物碰撞动力响应分析[J].海洋通报,2015,34(1):113-120.
[7]蓝天,余建星,张英,等.基于ABAQUS的拖锚载荷对海底管线的影响研究[J].天津理工大学学报,2014,30(1):1-5.
[8]杨秀娟,修宗祥,闫相祯,等.海底管道受坠物撞击的三维仿真研究[J].振动与冲击,2009,28(11):47-50.
[9]白俊磊.海底管道坠物碰撞损伤数值模拟分析研究[D].大连:大连理工大学,2013.
[10]王懿,胡知辉,段梦兰,等.基于CEL的船舶抛锚撞击对海底管道影响分析[J].石油机械,2015,43(5):58-62.
[11]NOH W F.CEL:A time-dependent,two-space-dimensional,coupled eulerian-lagrangian code[J].Methods in Computational Physics,1964(3):117-179.
[12]WANG D,RANDOLPH M F,WHITE D J.A dynamic large deformation finite element method based on mesh regeneration[J].Computers&Geotechnics,2013,54(10):192-201.
[13]张国强.鱼雷锚贯入过程的数值研究[D].大连理工大学,2015.
[14]KIM Y H,HOSSAIN M S,WANG D,et al.Numerical investigation of dynamic installation of torpedo anchors in clay[J].Ocean Engineering,2015,108(Supplement S67):820-832.
[15]KO Junyang,JEONG S,LEE J K.Large deformation FE analysis of driven steel pipe piles with soil plugging[J].Computers&Geotechnics,2016,71:82-97.
[16]龚少军,尤庆华.船舶深水抛锚方法分析[J].中国航海,2008,31(2):193-196.
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