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| Abstract: |
| Due to high temperature and pressure, unburied or shallow buried submarine pipelines experience lateral global buckling. Excessive bending caused by uncontrolled deformation may threaten the safety of the pipeline system. Thus, the integer of a post-buckling pipeline section should be assessed under design temperature and pressure differences. This study focuses on the post-buckling pipeline safety assessment. First, a series of model tests based on sand obtained from Bohai Gulf were proposed, and soil resistance to pipelines with different embedment are measured. A dynamic soil resistance model with varying pipeline embedment and lateral displacement was established. The influence of embedment on peak soil resistance and residual soil resistance was analyzed. Second, the critical buckling forces of pipelines with different imperfections were analyzed. A “critical force range” was proposed to evaluate whether the pipeline exhibits lateral global buckling or not. Third, the limit state of a post-buckling pipeline in an engineering case was assessed. The assessment was proposed based on both load control condition and displacement control condition. Further comparisons show that pipelines reach their limit state according to load control condition far more quickly than according to displacement control condition. |
| Key words: submarine pipelines lateral buckling pipe-soil interaction numerical research post-buckling pipeline assessment |
| DOI：10.11916/j.issn.1005-9113.18028 |
| Clc Number:TE54 |
| Fund: |
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| Descriptions in Chinese: |
| 深海高温管线水平向整体屈曲破坏临界状态分析 洪兆徽， 刘润 （天津大学 水利工程仿真与安全国家重点实验室， 天津 300072） 创新点说明：1） 在分析国内外已有土体对水平向运动管线的约束力模型的基础上，通过室内模型试验，改进和修正了土体约束力计算方法，建立了随水平向位移变化的动态土体约束力模型; 2）在有限元分析中引入动态土体阻力模型，基于更为真实的管土相互作用接触本构上对管线的整体屈曲和破坏进行了分析； 3）研究了管线的水平向整体屈曲和破坏极限，探究了不同形式破坏下的差异。 关键词：深海管线；水平向整体屈曲；管土相互作用分析；数值模拟研究；后屈曲临界状态 |
