海上超长管道浮运受力和变形特性

Floating stress and deformation characteristics of ultra-long offshore pipelines

随着中国经济发展,沿海城市对自然资源的需求日益增长,使用超长管道进行跨海域自然资源运输对沿海城市经济发展具有重大意义。但当前跨海超长管道的设计与铺设主要依靠经验与工程类比方法。为对海上超长管道浮运过程提供科学依据和实测数据,依托厦门同安湾海域管道浮运施工项目开展海上超长管道浮运过程的流固耦合数值模拟研究。结果表明:无论在水流还是波浪作用下,海上管道浮运时管身的应变及位移与管道的长细比、相对流速成正比,与拖船数量、管身弯折角度成反比;每增加1艘拖船管身最大位移约减小一半,改变拖船数量或拖力可有效控制管道变形;可根据管道浮运阻力和变形计算结果合理安排拖船,保证管道浮运施工安全;波流联合作用时管道变形较大,应选择海上波浪较小时进行管道浮运。

With the development of Chinese economy,the demand for natural resources in coastal cities is growing day by day,and it is of great significance to use superlong pipeline to transport natural resources across the sea to support economic development and construction of coastal cities.However,the design and laying of super long cross-sea pipeline mainly rely on experience and engineering analogy method.In order to provide sufficient scientific basis and measured data support for the floating process of offshore ultra-long pipeline,this research team carried out a fluidstructure coupling numerical simulation study on the floating process of offshore ultra-long pipeline based on the pipeline floating construction project in Tongan Bay,Xiamen,to obtain the deformation characteristics of the pipeline floating and apply them.The results show that the strain and displacement of floating pipelines are directly proportional to the slenderness ratio of pipelines and the relative velocity,and inversely proportional to the number of tugboats and the bending angle of pipelines.The maximum displacement of tugboat decreases by about half with each additional tugboat.Changing the number of tugboats or the towing force can effectively control the deformation of the pipeline.The calculation and analysis of the resistance and deformation of pipeline floating transportation is conducive to the reasonable arrangement of tugboats and the safety of pipeline floating transportation.When the wave and current are combined,the pipeline deformation is large and the floating transportation should be carried out when the sea wave is small.