ABSTRACT

Buckling is a crucial phenomenon to be considered in offshore pipelines and is dependent on the resistance of the surrounding soil, which depends on the diameter of the pipe (D) and embedment depth (H). In this study, the behaviour of the failure mechanisms and the capacity factors are investigated for a practical range of embedment depth (H) and diameter of offshore pipelines (D), using Indian coastal clay properties. A 2D plane-strain model was created using a finite element package PLAXIS 2D validated against previous studies. The immediate breakaway and no breakaway conditions are analyzed. The capacity factors are observed to increase with increasing embedment depth, up to a peak value and remain constant for further increase in embedment depth. The capacity factors are observed to be decreasing with increasing pipeline diameter. The failure mechanisms are shown using displacement contour diagrams and stress contours.

摘要

屈曲是海上管道中要考虑的一个关键现象，它取决于周围土壤的阻力，这取决于管道的直径 (D) 和嵌入深度 (H)。在这项研究中，使用印度沿海粘土特性，研究了海上管道埋置深度 (H) 和直径 (D) 的实际范围内的失效机制和容量因素的行为。2D 平面应变模型是使用有限元包 PLAXIS 2D 创建的，该软件包已针对先前的研究进行了验证。分析立即脱离和无脱离情况。观察到容量因子随着嵌入深度的增加而增加，达到峰值并保持恒定以进一步增加嵌入深度。观察到容量因子随着管道直径的增加而减小。