Global buckling of a submarine pipeline during high pressure/high temperature (HP/HT) operation results in a loss of pipeline stability that is similar to a bar in compression; this phenomenon constitutes one of the key factors affecting pipeline integrity and design. To intuitively study the buckling response, a test system was designed that can account for thermal loading and pipe-soil interactions, and this system was used to perform a series of small-scale model tests on the lateral buckling of submarine pipelines with different initial imperfections. Based on the hat-shaped buckling profiles of the test pipelines, a new buckling mode called "hat-shaped buckling" was proposed. In an attempt to study the conditions under which the pipeline exhibits this hat-shaped buckling mode, the changing law of the buckling mode was investigated through finite element analyses of pipelines with different parameters, including the length of the pipeline and the amplitude and wavelength of the initial imperfection. Subsequently, an analytical solution for calculating the buckling amplitude of a pipeline with a hat-shaped buckling profile was proposed. The theoretical solution was compared to the experimental data, which verified the feasibility of the model in calculating pipeline buckling deformation. The experimental data, the buckling mode based on these data and the corresponding analytical model discussed herein may provide a reference for future experimental studies of pipeline buckling.

高压/高温（HP / HT）操作期间海底管道的整体屈曲会导致管道稳定性的损失，类似于压缩的压力；这种现象是影响管道完整性和设计的关键因素之一。为了直观地研究屈曲响应，设计了一个可以考虑热负荷和管土相互作用的测试系统，并使用该系统对具有不同初始缺陷的海底管道的横向屈曲进行了一系列小规模模型测试。 。基于测试管道的帽形屈曲轮廓，提出了一种新的屈曲模式，称为“帽形屈曲”。为了尝试研究管道呈现出这种帽形屈曲模式的条件，通过对具有不同参数的管道的有限元分析，包括管道的长度以及初始缺陷的幅度和波长，研究了屈曲模式的变化规律。随后，提出了一种计算具有帽形屈曲轮廓的管道屈曲幅度的解析解。将理论解与实验数据进行比较，验证了该模型在计算管道屈曲变形中的可行性。实验数据，基于这些数据的屈曲模式以及本文讨论的相应分析模型可以为管道屈曲的未来实验研究提供参考。包括管道的长度以及初始缺陷的幅度和波长。随后，提出了一种计算具有帽形屈曲轮廓的管道屈曲幅度的解析解。将理论解与实验数据进行比较，验证了该模型在计算管道屈曲变形中的可行性。实验数据，基于这些数据的屈曲模式以及本文讨论的相应分析模型可以为管道屈曲的未来实验研究提供参考。包括管道的长度以及初始缺陷的幅度和波长。随后，提出了一种计算具有帽形屈曲轮廓的管道屈曲幅度的解析解。将理论解与实验数据进行比较，验证了该模型在计算管道屈曲变形中的可行性。实验数据，基于这些数据的屈曲模式以及本文讨论的相应分析模型可以为管道屈曲的未来实验研究提供参考。验证了该模型在计算管道屈曲变形中的可行性。实验数据，基于这些数据的屈曲模式以及本文讨论的相应分析模型可以为管道屈曲的未来实验研究提供参考。验证了该模型在计算管道屈曲变形中的可行性。实验数据，基于这些数据的屈曲模式以及本文讨论的相应分析模型可以为管道屈曲的未来实验研究提供参考。