含初始缺陷海底管道侧向屈曲临界力的参数解

未埋设的海底管道在高温高压运行条件下可能发生侧向屈曲，情况严重时影响海底管道的结构安全。侧向屈曲临界力作为判定海底管道发生侧向屈曲的重要依据，主要影响因素有初始缺陷、管土相互作用等。现有关于侧向屈曲临界力的公式并未考虑管土相互作用、缺陷不平直度和管道自身材料特性对侧向屈曲临界力的综合影响。建立含有通用几何初始缺陷海底管道的数值模型，使用Riks算法进行参数分析以研究极限侧向土壤阻力、管道缺陷不平直度和截面几何尺寸对海底管道侧向屈曲的具体影响。基于量纲分析法和多元线性回归，推导出海底管道侧向屈曲临界力关于上述3个影响参数的一般公式，并对该公式进行了检验，结果表明文中推导的公式在参数涵盖的研究范围内有效。

Parametric solution of critical force for lateral buckling of submarine pipelines with initial imperfection

Unburied submarine pipelines may experience lateral buckling under high temperature and high pressure operating conditions, which affects the structural safety of submarine pipelines in severe cases. The lateral buckling critical force, as an important basis for judging the occurrence of lateral buckling in submarine pipelines, is affected by initial imperfection, pipe-soil interaction, and etc. The current formulas do not take into account the combined effects of pipe-soil interaction, imperfect out-of-straightness and material properties of pipelines on the lateral buckling critical force. Numerical models of submarine pipelines with general geometric initial imperfection are established, and the Riks algorithm is used for parametric analysis to study the specific effects of the ultimate lateral soil resistance, the imperfect out-of-straightness and the cross-section of pipelines on the lateral buckling of submarine pipelines. Based on the dimensional analysis method and multivariate linear regression, the general formula of the lateral buckling critical force of submarine pipelines with the three parameters is deduced, and the formula is tested. The results show that the formula derived in this paper is valid within the research scope covered by the parameters.