李成凤¹, 刘 润¹, 彭碧瑶¹, 王秀妍¹
天津大学 水利工程仿真与安全国家重点实验室

摘要:
高温高压下海底管道的整体屈曲稳定性分析是管道设计的重要组成部分, 而选取多长的管道进行分析对其整体屈曲稳定性结果影响显著。依据临界管长将管道分为“长管”与“短管”, 基于动力显式分析方法, 揭示了长管与短管在发生整体屈曲过程中, 屈曲幅值与波长、管壁轴向压力、轴向应变及轴向位移的变化规律; 研究了土体约束力影响管道临界长度的规律性, 分析了土体约束力系数对长管与短管整体屈曲变形的影响。研究发现, 土体约束力对短管的整体屈曲行为影响显著, 短管的整体屈曲幅值随土体约束力系数的增大呈现先增大后减小的趋势。该项研究对区分不同长度管道的整体屈曲类型进而采取有效防控措施具有重要参考价值。
关键词:海底管道整体屈曲土体约束力长管短管
DOI：10.11759/hykx20170605001
分类号:
基金项目:国家重点基础研究发展计划(973 计划)(2014CB046802); 国家自然科学基金面上项目(51679162); 天津市自然科学基金(17JCZDJC39900)

Influence of soil constraint on global buckling of submarine pipelines
LI Cheng-feng,LIU Run,PENG Bi-yao,WANG Xiu-yan
Abstract:
A stability analysis of the global buckling of submarine pipelines is important in pipeline design. In this study, a stability analysis was performed on a submarine pipeline under high temperature and pressure. Pipe length has a significant effect on the global buckling of a pipe; hence, the pipe was divided into “long pipe” and “short pipe” based on the critical length. Using the finite element method (FEM), the variation regularities of the wavelength and amplitude of buckling, pipe axial force, pipe axial strain, and pipe axial displacement were revealed based on the global buckling of the long and short pipes. The effect of soil constraint force on the pipe critical length was studied, as well as the effect of soil constraint force coefficient on the global buckling of the long and short pipes. The result shows that the soil constraint force significantly affects the global buckling of short pipe, and the global buckling amplitude of the short pipe increases and then decreases with an increase in the soil constraint force coefficient.
Key words:submarine pipeglobal bucklingsoil constraint forcelong pipeshort pipe





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