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高温高压海底管道轴向定向移动消减方案研究
刘 润, 郝心童, 李成凤, 彭碧瑶
天津大学 水利工程仿真与安全国家重点实验室
摘要:
不埋深海管道在温压荷载循环作用下,易发生轴向定向移动,且轴向移动量会随着循环次数的增加而不断累积,从而导致管道连接处断裂等安全问题。钢悬链线立管(SCR)张力,海床倾角及瞬态热梯度是引起管道轴向移动的主要因素。本文在论证了SCR张力相比于其他因素对管道轴向移动影响更为显著的基础上,针对一端受到SCR张力作用的短管,分析了不同轴向移动消减方案的作用特点。研究表明,对管道进行锚固能有效约束其轴向移动,且在中部锚固需要的锚固力及管道内产生的有效轴向力均较小;滑动基础可通过释放一定的管道位移量来减少管中的应力累积;因此将中部锚固与端部滑动相结合可使锚固力进一步下降54%,管中最大有效轴向压力减小33%。
关键词:  海底管道  轴向定向移动  立管张力  锚桩  滑动基础
DOI:10.11759/hykx20190320002
分类号:TE58
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);天津市自然科学基金重点项目
STUDY ON DEEP-SEA PIPELINE WALKING MITIGATION
LIU Run, HAO Xintong, LI Chengfeng, PENG Biyao
State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University
Abstract:
Non-buried deep-sea pipeline under cyclic thermal loading and internal pressure is prone to axial walking. The axial movements will accumulate over operational cycles, which can lead to ruptures of end connections. Steel catenary riser (SCR) tension, sloping seabed and thermal transients are the three driven mechanisms known to cause pipeline walking. This paper firstly discusses the more significant influence that the SCR tension has on the pipeline walking than other mechanisms. Then, the effect of different walking mitigation methods is presented with a pipeline model connected to SCR. The results have shown that axial walking can be effectively restrained by using anchor piles. Additionally, anchor force and effective axial force are smaller when the anchor is installed at the middle of the pipeline. Sliding foundations have been used to minimize the accumulative stress in the pipeline by allowing free end movements. The combination of sliding foundation at the end and anchor located at the midline can further reduce the anchor force by 54% and the compressive effective axial force by 33%.
Key words:  subsea pipelines  axial walking  SCR tension  anchor piles  sliding foundation
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