考虑跨肩管土作用的悬跨管道涡激振动特性研究

海底悬跨管道涡激振动是一个复杂的流场-管道结构-跨肩土体耦合问题,其发生机理和振动特性十分复杂,特别是两端跨肩处管土作用对涡激振动的影响有待深入讨论。为此,文章引入了P-y曲线描绘跨肩处管土耦合作用,提出了基于管道位移和速度的新非线性土体弹簧模型,根据能量平衡原理计算土体阻尼,采用尾流振子模型模拟悬跨管段流固耦合作用,建立了考虑流—固—土多场耦合作用的海底悬跨管道涡激振动预报模型,并重点研究了考虑跨肩管土作用时,悬跨管道涡激振动的诸多特性。

Study on vortex-induced vibrations(VIV)of free spanning pipeline considering pipe-soil interaction boundary conditions

Vortex-induced vibrations (VIV) of free spanning pipeline is a complex fluid-structure-soil coupling problem.Especially the effect of pipe-soil interaction in the shoulders on VIV was not investigated deeply.In this paper, the P-y curve was used to model pipe-soil interaction in the shoulders, a new non-linear soil spring which is based on the displacement and velocity of pipeline was proposed, the soil damp-ing was calculated according to energy balance principle, the wake oscillator model was employed to de-scribe the fluid-structure interaction,the VIV prediction model was built considering fluid-structure-soil coupling, and the characteristics of VIV of free spanning pipeline considering pipe-soil interaction were dis-cussed in details.