海底滑坡对管线冲击力的数值分析

王忠涛; 张宇; 杨庆; 王寒阳

doi:10.11779/CJGE201903020

海底滑坡对管线冲击力的数值分析 English Version

大连理工大学海岸和近海工程国家重点实验室,辽宁大连 116023

基金项目: 国家自然科学基金项目（51639002,41772296）

详细信息

作者简介:
王忠涛(1974- ),男,副教授,主要从事海洋岩土工程等方面的教学和科研工作。E-mail：zhongtao@dlut.edu.cn。

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出版历程
- 收稿日期: 2018-09-09
- 发布日期: 2019-03-24

Numerical analysis for impact of submarine landslides on pipelines

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

摘要

摘要: 输送原油和天然气的海底管线常处于复杂的海洋地质环境,在海底滑坡的冲击下可能发生失稳破坏。以往研究成果多集中讨论海底滑坡对悬跨管线的冲击力,但对置于海床表面的管线受不同角度海底滑坡的冲击作用讨论较少,也未深入讨论悬跨高度对管线受海底滑坡冲击力的影响。基于Herschel-Bulkley模型,采用计算流体动力学CFD法模拟了不同冲击角度下海底滑坡对置于海床表面管线的作用力,对比已有模型试验成果提出了管线纵向和轴向阻力系数的计算公式。按照土力学方法对CFD数值计算结果重新整理,指出土力学和流体力学方法在计算管线受海底滑坡冲击力方面的实质对应关系,并给出管线破坏包络线的解析表达式。随后讨论了悬跨高度对管线受力的影响,最后提出了综合考虑冲击角度和悬跨高度影响的海底滑坡对管线作用力的计算公式。研究成果对海底路由选址和海底管线设计具有一定的应用价值。
- 海底管线 /
- 海底滑坡 /
- CFD模拟 /
- 悬跨高度
Abstract: Submarine pipelines, as important transporting channels of undersea crude oil and natural gas in marine engineering, are usually in the condition of complex marine geological environment and often damaged by the impact of the submarine landslides. The resistance forces of the laid-on-seafloor submarine pipeline impacted by landslides oriented at different angles are studied by using the CFD method based on the Herschel-Bulkley model. Both the computation expressions for normal and axial drag coefficients are provided through the comparison with the published results of model tests. The substantive correspondence between fluid mechanics and geotechnical approaches is found through re-analysis of the data from CFD simulation. Further, the critical suspended distance is summarized by simulating the interaction forces between submarine landslides and pipelines at different suspended distances, and the relationship between drag force and suspended distance is obtained. The research extends the predecessors’ work by enriching the expressions for calculating the axial and normal drag coefficients for pipelines in different suspended states. The proposed formula for estimating the impact force of the submarine landslides on pipelines maybe be practically helpful for selection of router sites and design of pipelines.
- submarine pipeline /
- submarine landslide /
- CFD method /
- suspended distance

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参考文献(18)

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施引文献(8)

期刊类型引用(5)

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