含凹陷海底管道安全评价与屈曲机理研究现状

凹陷是海底管道受到外部挤压或碰撞而产生的几何缺陷,是造成海底管道失效的主要原因之一。为了提供一定的海底管道设计、制造、安装及运行监测的参考依据,文中从安全评价方法与屈曲机理两方面总结了近年来国内外的研究进展,阐述了基于深度和应变模型的纯凹陷和含其它缺陷凹陷的评估方法,介绍了含凹陷海底管道在纯外压、纯弯矩和内压+弯矩载荷作用下的屈曲机理研究现状。在此基础上,提出目前研究还不够全面,并指出可以考虑基于应变、应力的双重准则和其他缺陷的具体影响,以及国内安全性评价准则建立的必要性;同时提出多种载荷作用下的屈曲机理研究是今后发展的趋势。

Review of Assessment and Buckling Researches on Dented Subsea Pipelines

Dent, which is a geometric defect caused by the external extrusion or collision, is one of the main reasons of failure of subsea pipelines. In order to provide references for design, manufacture, installation and operational monitoring of subsea pipelines, this paper took a review of researches on both assessment and buckling of dented subsea pipelines from these years. Assessment methods on depth-based and strain-based models for plain dents and methods for defected dents were presented. Meanwhile, research status on dented subsea pipelines under pure external pressure, pure bending moment and internal pressure associated with bending was described. On this basis, this paper proposed the researches were not comprehensive in the present. Meanwhile, it pointed out that double norm based on both of strain and stress and detailed influences by other defects should be considered. And it is necessary to build our national assessment standard. Besides, buckling of dented subsea pipelines under associated external loads will be the trend in the future.