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Engineering measures for preventing upheaval buckling of buried submarine pipelines

ISSN号：0253-4827
期刊名称：《应用数学和力学：英文版》
时间：0
分类：TU723.3[建筑科学—建筑技术科学] TE973.92[石油与天然气工程—石油机械设备]
作者机构：[1]StateKeyLaboratoryofHydraulicEngineeringSimulationandSafetyjTianjinUniversity,Tianjin300072,P．R．China, [2]SchoolofEngineeringDesign,PennsylvaniaStateUniversity,UniversityPark,PA16802,Pennsylvania,USA
相关基金：Project supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China （No. 51021004）, the National Natural Science Foundation of China （No. 40776055）, and the Foundation of the State Key Laborary of Ocean Engineering （No. 1002）

关键词：海底管道, 热屈曲, 工程, 止动, 高压管道, 轴向应力, 内部压力, 保护措施, submarine buried pipeline, thermal stress, upheaval buckling, protectionmeasure

中文摘要：

In-service hydrocarbons must be transported at high temperature and high pressure to ease the flow and to prevent the solidification of the wax fraction.The high temperature and high pressure will induce the additional stress in the pipeline,which results in the upheaval buckling of the pipeline.If such expansion is resisted,e.g.,by the frictional effects of the foundation soil over a kilometer or of a pipeline,the compressive axial stress will be set up in the pipe-wall.When the stress exceeds the constraint of the foundation soil on the pipeline,suddenly-deforming will occur to release the internal stress,similar to the sudden deformation of the strut due to stability problems.The upheaval buckling may jeopardize the structural integrity of the pipeline.Therefore,effective engineering measures against this phenomenon play an important role in the submarine pipeline design.In terms of the pipeline installation and protection measures commonly used in Bohai Gulf,three engineering measures are investigated in great details.An analytical method is introduced and developed to consider the protection effect of the anti-upheaval buckling of the pipeline.The analysis results show that the amplitude of the initial imperfection has a great effect on the pipeline thermal upheaval buckling.Both trenching and burial and discrete dumping are effective techniques in preventing the pipeline from buckling.The initial imperfection and operation conditions of the pipelines determine the covered depth and the number of layers of the protection measures.

英文摘要：

In-service hydrocarbons must be transported at high temperature and high pressure to ease the flow and to prevent the solidification of the wax fraction. The high temperature and high pressure will induce the additional stress in the pipeline, which results in the upheaval buckling of the pipeline. If such expansion is resisted, e.g., by the frictional effects of the foundation soil over a kilometer or of a pipeline, the compressive axial stress will be set up in the pipe-wall. When the stress exceeds the constraint of the foundation soil on the pipeline, suddenly-deforming will occur to release the internal stress, similar to the sudden deformation of the strut due to stability problems. The upheaval buckling may jeopardize the structural integrity of the pipeline. Therefore, effective engineering measures against this phenomenon play an important role in the submarine pipeline design. In terms of the pipeline installation and protection measures commonly used in Bohai Gulf, three engineering measures are investigated in great details. An analytical method is introduced and developed to consider the protection effect of the anti-upheaval buckling of the pipeline. The analysis results show that the amplitude of the initial imperfection has a great effect on the pipeline thermal upheaval buckling. Both trenching and burial and discrete dumping are effective techniques in preventing the pipeline from buckling. The initial imperfection and operation conditions of the pipelines determine the covered depth and the number of layers of the protection measures.