非均匀温度场下深海夹层管侧向屈曲影响因素研究  

Study of Factors Affecting Lateral Buckling of Deep-Sea Sandwich Pipe Under Nonuniform Temperature Field

作　　者：薛嘉琦 李昌良 张亚 张磊 XUE Jiaqi;LI Changliang;ZHANG Ya;ZHANG Lei(College of Mechanical and Electronic Engineering,China University of Petroleum,Qingdao 266580,China;Offshore Petroleum Engineering Institute of Sinopec Shanghai Offshore Oil and Gas Company,Shanghai 200120,China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]中石化上海海洋油气分公司,上海200120

出　　处：《海洋技术学报》2024年第6期56-67,共12页Journal of Ocean Technology

基　　金：国家重点研发计划资助项目(2016YFC0303800)。

摘　　要：深海高压和低温环境使得海底管道的整体屈曲现象日益突显,其中流体流态、管道初始缺陷和管土摩擦作用对海底管道整体屈曲的影响尤为显著。针对管道的非均匀温度分布及深海高压环境,本文建立了非均匀温度场下夹层管整体屈曲分析有限元模型,探讨了两种流态下夹层管各层管道在屈曲变形过程中的位移构型和受力状态,分析了管道缺陷参数和管土摩擦对管道屈曲特性的影响。计算结果表明:夹层管在屈曲过程中,内管和夹芯层受热膨胀轴向受压,外管受迫变形轴向受拉;紊流工况下夹层管整体应力大于层流工况,管道的侧向位移和轴向位移随轴向摩擦系数的增大而减小,随缺陷幅值的增长而增大,缺陷幅值达1.2 m后,增幅迅速降低;管道临界屈曲温度与缺陷幅值呈正相关,但与管土摩擦系数呈负相关;缺陷幅值越大,管道最大应力越早进入塑性阶段。Deep-sea high-pressure and low-temperature environments increasingly highlight the overall buckling phenomenon of submarine pipelines,in which the effects of fluid flow state,initial defects of pipelines and pipe-soil friction on the overall buckling of submarine pipelines are particularly significant.In view of the non-uniform temperature distribution of the pipeline and the high-pressure environment in the deep sea,a finite element model is established to analyze the overall buckling of the sandwich pipe under the nonuniform temperature field.The displacement configurations and force states of each layer of the sandwich pipe in the buckling deformation process under the two types of fluid flow patterns are investigated,and the influences of the pipeline defects and the pipe-soil friction on the buckling characteristics of the pipeline are analyzed.Calculation results show that:in the process of buckling of the sandwich pipe,the inner pipe and the sandwich layer are axially compressed by thermal expansion,and the outer pipe is axially tensile by forced deformation.The overall stress of the sandwich pipe under turbulent flow condition is larger than that of the laminar flow.The lateral displacement and axial displacement of the pipeline decrease with the increase of axial friction coefficient and increase with the growth of defect amplitude,while the increase decreases rapidly after the defect amplitude reaches 1.2 m.The critical buckling temperature of the pipeline is positively correlated with the defect amplitude but negatively correlated with the pipe-soil friction coefficient.A larger defect amplitude leads to the pipeline's maximum stress entering the plastic stage earlier.

关 键 词：深海夹层管 非均匀温度场 侧向屈曲 初始缺陷 

分 类 号：U173.9[交通运输工程]