外压影响下含凹陷深海管道局部屈曲和压缩应变承载力研究
Study on the localized buckling and compressive strain capacity of deep-sea pipelines with dent defect under external pressure
贾鲁生 1侯富恒 2张琦 2陈严飞 2钟榕锋 2高志浩2
作者信息
- 1. 中国石油大学(北京)油气管道输送安全国家工程实验室,北京 102249;中海油研究总院有限责任公司,北京 100028
- 2. 中国石油大学(北京)油气管道输送安全国家工程实验室,北京 102249
- 折叠
摘要
凹陷是海底管道常见的缺陷形式,海床位移与高静水压力易引起管道局部屈曲失效,因此,明确外压与位移作用下含凹陷管道局部屈曲失效机理和压缩应变承载力尤为重要.建立含凹陷深海管道有限元数值模型,研究了弯矩作用下含凹陷深海管道的局部屈曲失效机理,计算了压缩应变承载力,分析了外压和凹陷深度对管道失效模式和管道压缩应变承载力的影响规律.结果表明,凹陷的深度与外压的不同会导致管道的局部屈曲失效模式不同,总体来说,管道的压缩应变承载力随着外压的增大而减小.当外压大于0.1时,凹陷越深管道的压缩应变承载力越大,当外压小于0.1时则相反.最后提出含凹陷海底管道压缩应变承载力的预测方法,为海底管道的完整性评价提供了一定参考.
Abstract
Dent is a common defect in subsea pipelines.Seabed displacement and high hydrostatic pressure can easily cause localized buckling failure of pipelines.Therefore,it is particularly important to clarify the failure mechanism of localized buckling and compressive strain capacity of pipelines with dent under the action of external pressure and displacement.A finite element numerical model of deep-sea pipelines with dent was established to study the failure mechanism of localized buckling under the action of bending moment and to calculate the compressive strain capacity.This study also analyzed the influence of external pressure and dent depth on the failure mode and compressive strain capacity of pipelines.The results show that the dent depth and different external pressures can lead to different localized buckling failure modes of pipelines.Generally,the compressive strain capacity of pipelines decreases with increasing external pressure.When the external pressure is greater than 0.1,the deeper the dent,the greater the compressive strain capacity of the pipeline.When the external pressure is less than 0.1,the opposite is true.Finally,a predictive method for the compressive strain capacity of dented deep-sea pipelines is proposed,providing a reference for the integrity assessment of deep-sea pipelines.
关键词
深海管道/凹陷/压缩应变承载力/局部屈曲/位移控制Key words
deep-sea pipelines/dent defect/compressive strain capacity/localized buckling/displacement control引用本文复制引用
出版年
2024
NETL
NSTL
万方数据