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[1]路顺　闫术明　周晓东　曹志强　金辉.砂质海床上海底管道侧向失稳试验研究[J].油气储运,2024,43(06):1-11.
　LU Shun,YAN Shuming,ZHOU Xiaodong,et al.Test of pipeline lateral instability on sandy seabed[J].Oil & Gas Storage and Transportation,2024,43(06):1-11.

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砂质海床上海底管道侧向失稳试验研究

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年06期页码: 1-11 栏目: 出版日期: 2024-06-25

Title:: Test of pipeline lateral instability on sandy seabed

作者:: 路顺　闫术明　周晓东　曹志强　金辉

Author(s):: LU Shun; YAN Shuming; ZHOU Xiaodong; CAO Zhiqiang; JIN Hui

关键词:: 海底管道; 砂质海床; 失稳; 机械加载; 端部约束; 侧向土阻力系数

Keywords:: offshore pipeline; sandy seabed; pipeline instability; mechanical loading; test device; end constraints; lateral soil resistance coefficient

分类号:: TE88

文献标志码:: A

摘要:: 【目的】海洋环境具有复杂性及不可预测性，铺设于砂质海床上的海底管道易发生侧向失稳，但目前对海底管道侧向失稳的成因尚不明晰，亟需探究海流荷载作用下砂质海床上管道侧向失稳过程中的水动力荷载、管土相互作用等多种影响因素的耦合机制。【方法】采用自主设计搭建的管土相互作用试验装置开展了多类型模型试验，探究了海底管道侧向失稳的物理机制，分析了海底管道水下重力、管土摩擦因数、管道初始嵌入深度比、不同砂质土壤、端部约束条件等对极限侧向土阻力、侧向土阻力系数的影响。【结果】侧向土阻力随海底管道水平位移的增加而逐渐增大，并最终达到极限值；侧向土阻力系数随管道水下重力的增加而逐渐减小，最终趋于稳定值；防滚管道的侧向土阻力系数随摩擦因数的增大而增大，自由管道的摩擦因数对侧向土阻力系数的影响较小；防滚管道的侧向土阻力系数远大于管道两端自由的工况；防滚管道的初始嵌入深度比对管道出现最大沉降量及发生极限侧向土阻力的位置具有重要影响。【结论】通过砂质海床上海底管道侧向失稳试验，明确了海流荷载作用下管道侧向失稳过程中极限侧向土阻力发展规律，可为海底管道的设计、铺设及安全运行提供技术支撑。

Abstract:: The offshore pipelines laid on sandy seabed are prone to lateral instability due to the complexity and unpredictability of the offshore environment. However, the mechanism of lateral instability of offshore pipelines is not yet clear, and it is urgent to explore the pipe soil interaction mechanism during the lateral instability process of pipelines on sandy seabed under current loads. A series of model tests were carried out by using a self-designed pipe-soil interaction test device. The effects of submerged weight of pipelines, pipe-soil friction coefficient, initial embedding depth ratio of pipelines, different sandy soils and end constraints on ultimate lateral soil resistance and lateral soil resistance coefficient were investigated. The results show that the lateral soil resistance gradually increases with the increase of horizontal displacement and finally reaches the limit value. The lateral soil resistance coefficient gradually decreases with the increase of the underwater weight of the pipeline and finally tends to be stable. The lateral soil resistance coefficient of anti-rolling pipeline increases with the increase of friction coefficient, and the friction coefficient of free pipeline has little effect on the lateral soil resistance coefficient. The lateral soil resistance coefficient of the anti-rolling pipe is much larger than that of the free end of the pipe. The initial embedding depth ratio of the anti-rolling pipeline affects the maximum settlement and the position of the ultimate lateral soil resistance. The development rules of the ultimate lateral soil resistance during the lateral instability of pipelines under current loads have been clarified by various types of mechanical loading test research, which can provide technical support for the design, laying and safe operation of offshore pipeline.

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更新日期/Last Update: 2024-03-11