夹层海底管道在侧向撞击力下的凹陷行为

夹层管作为油气输送管线应用于深水高压和管道碰撞事故频发的海洋环境中,能提供更大的结构抗力,但目前对夹层管受坠物撞击凹陷行为的认识尚不深入.为此,基于薄壁管凹陷变形理论模型,采用有限元方法研究了夹层管在侧向载荷作用下的结构凹陷行为,通过参数分析,探讨了内部介质压力、外部静水压力和环空率等对夹层管结构响应的影响.研究结果表...

Denting Behavior of Submarine Sandwich Pipe under Lateral Impact Force

As an oil and gas pipeline,the sandwich pipe is used in high pressure deep water and frequent pipeline collision marine environment to provide greater structural resistance.The current understanding of the denting behavior of the sandwich pipe impacted by falling objects is not deep.Therefore,based on the thin-walled pipe denting deformation theory model,the finite element method is used to study the structural denting behavior of the sandwich pipe under lateral load.Through parameter analysis,the effects of internal medium pressure,external hydrostatic pressure and annulus ratio on the sandwich pipe structure response are discussed.The research results show that the load resistance of the sandwich pipe increases nonlinearly with the denting depth.Its denting deformation conforms to the denting deformation mechanism of the rigid-plastic three-dimensional shell of the thin-walled pipe.The increase of internal pressure can increase the resistance of the pipeline to the impact load,while the external pressure effect is the opposite.Increasing the thickness of the core layer can improve the energy absorption ratio of each layer of the sandwich pipe,thereby protecting the internal and external pipeline.The study has certain guiding significance for the design and safety assessment of sandwich insulation pipeline.