基于CEL方法的黏土环境下海底管道初始沉降研究
Study on initial embedment of submarine pipeline in clay environment based on the CEL method
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- 引用格式:
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何杨,赵洪扬,赵党,张润东,李传龙,丁力.基于CEL方法的黏土环境下海底管道初始沉降研究[J].天然气与石油,2025,43(2):99-106.doi:10.3969/j.issn.1006-5539.2025.02.013
HE Yang, ZHAO Hongyang, ZHAO Dang, ZHANG Rundong, LI Chuanlong, DING Li.Study on initial embedment of submarine pipeline in clay environment based on the CEL method[J].Natural Gas and Oil,2025,43(2):99-106.doi:10.3969/j.issn.1006-5539.2025.02.013
- DOI:
- 10.3969/j.issn.1006-5539.2025.02.013
- 作者:
- 何杨1 赵洪扬1 赵党1 张润东1 李传龙1 丁力2
HE Yang1, ZHAO Hongyang1, ZHAO Dang1, ZHANG Rundong1, LI Chuanlong1, DING Li2
- 作者单位:
- 1. 海洋石油工程股份有限公司, 天津 300451; 2. 天津市科技创新发展中心, 天津 300220
1. Offshore Oil Engineering Co., Ltd., Tianjin, 300451, China; 2. Tianjin Technology Innovation Center, Tianjin, 300220, China
- 关键词:
- 海底管道;黏土海床;初始沉降;有限元;欧拉—拉格朗日耦合方法
Submarine pipeline; Clay seabed; Initial embedment; Finite element; Coupled Eulerian-Lagrangian(CEL) method
- 摘要:
在海洋油气深水领域开发中,管道通常直接裸露铺设于海床上,安装期产生的初始沉降量是计算稳定性及侧向屈曲的基础数据,合理评估管道的初始沉降在海管结构设计中尤为重要。通过有限元软件ABAQUS中欧拉—拉格朗日耦合(Coupled Eulerian-Lagrangian,CEL)方法对黏土环境下海底管道初始沉降展开研究,采用DNV-RP-F114《海底管道管土相互作用》(Pipe-soil interaction for submarine pipelines,以下简称DNV-RP-F114)方法进行对比验证,阐述了管道垂向下沉过程中黏土海床的形态变化、应力响应及塑性区发展规律,分析了不同强度土体以及不同摩擦系数对管道初始沉降的影响。结果表明,相较于DNV-RP-F114方法,CEL方法计算初始沉降量更小,数值模型符合土力学机理,管道初始沉降受土体强度的影响较显著,而摩擦系数对管道初始沉降的影响较小。研究结果对海底管道初始沉降分析具有借鉴意义,可为海底管道结构设计提供参考。
In the development of offshore oil and gas deepwater field, pipelines are often laid directly on the sea bed. The initial embedment generated during installation is the basic data for stability and lateral buckling calculation, making it particularly important to evaluate the initial embedment of pipelines accurately. This paper studies the initial embedment of submarine pipeline in clay environment using the Coupled Eulerian-Lagrangian(CEL) method in finite element software ABAQUS. The DNV-RP-F114 Pipe-soil interaction for submarine pipelines(hereinafter referred to as DNV-RP-F114) method is used for comparison and verification. The study clarifies the morphological changes, stress response and the development pattern of plastic zones in the clay seabed during pipeline sinking. Additionally, the influence of soil with different strengths and friction coefficients on the initial embedment of pipeline is analyzed. The results show that, compared with the DNV-RP-F114 method, the initial embedment calculated using the CEL method is smaller. The numerical model conforms to the soil mechanics principles, showing that the pipeline initial embedment is significantly affected by soil strength, while the change of friction coefficient has a minimal effect. The research results can provide reference for the analysis of initial embedment of submarine pipelines and guidance for the structural design of submarine pipelines.
