The influence of sea state on dynamic behaviour of offshore pipelines for deepwater S-lay
The influence of sea state on dynamic behaviour of offshore pipelines for deepwater S-lay
复制标题
海况对深水S敷设海上管道动力行为的影响
DOI：
10.1016/j.oceaneng.2015.11.013
复制
发表时间：
2016-01-01
影响因子：
5
通讯作者：
Xu, Pu
中科院分区：
文献类型：
--
作者：
Gong, Shunfeng;Xu, Pu
深水S型铺设引起的海底管道动力响应是一个非常引人注目的问题，直接影响到此类结构的设计和实际安装的可行性。利用OrcaFlex软件专门开发了深水S型铺设系统的综合有限元模型，以探讨海况对管道动态响应的影响，考虑了表面波、海流、铺管船运动、管道与滚筒之间的碰撞接触。同时，采用非线性滞回土模型模拟管道与海床的竖向相互作用，采用修正的库仑摩擦模型模拟管道与海床的横向相互作用。然后利用该数值模型对南海荔湾3 -1气田使用HYSY 201铺管船在水深1500 m的海底铺设12 in天然气外输管道进行了各种海况下的实例分析。定量地估算了海况对海底管道在外形、侧向位移、轴向拉力、弯矩、应力应变以及管道埋置等方面的动力特性的影响。研究结果表明，表面波和由此产生的铺管船运动之间存在很强的相关性，管道动态响应。(C)2015爱思唯尔有限公司版权所有。
The dynamic response of offshore pipelines induced by deepwater S-lay is highly noticeable, and directly dominates the design of such structures and the installation feasibility in practice. A comprehensive finite element model for deepwater S-lay systems using the software OrcaFlex is specially developed to explore the influences of sea state on the pipeline dynamic responses, considering surface waves, ocean currents, pipelay vessel motions, clashing contact between the pipeline and rollers. Meanwhile, a nonlinear hysteretic soil model is applied to simulate the vertical pipe-seabed interaction, and the modified Coulomb friction model is used to model the lateral pipe-seabed interaction. The numerical model is then used to carry out an illustrative example analysis of a 12-in, gas export pipeline being laid onto the seabed with a water depth of 1500 m using the HYSY 201 pipelay vessel in the LW3-1 gas field in the South China Sea under various sea states. The influences of sea state on the pipeline dynamic behaviour on aspects of configuration, lateral displacement, axial tension, bending moment, stress and strain as well as pipeline embedment are estimated quantitatively. The findings show that a strong relevance exists between surface wave and resulting pipelay vessel motions, and pipeline dynamic responses. (C) 2015 Elsevier Ltd. All rights reserved.