浅谈海管设计项目设计实践中不同管土模型在侧向屈曲分析中的影响

Effects of Different Soil-Pipe Interaction Models on Pipeline Lateral Buckling Learned from WC 13-6 Detailed Design Project

在一些工程项目中，海底管道被设计成不进行挖沟铺设，管道依靠自身的重力置于海床之上。在这种不埋土的情况下，由高温高压所导致的膨胀，会使管道处于侧向屈曲的危险之中。在侧向屈曲的分析中，摩擦力起着非常重要的作用。目前，常用的分析方法是采用库仑摩擦模型（Coulomb friction），但是这种线性模型有时过于保守；该论文就是要比较这种线性模型和其它不同的（非线性）管土模型在侧向屈曲分析中的影响，并通过在文昌13-6海管设计项目实践中的定量分析比较，建议在侧向屈曲分析中采用被动土址阻力模型。

Most of subsea pipelines are laid on seabed without trench burial. Pipelines are placed on the seabed with their own self-weight. Under such exposed condition, pipelines are susceptible to buckling laterally due to expansion induced by high temperature and high pressure. Friction plays a significant role in lateral buckling analysis. A common method to consider friction effect in industry is to employ Coulomb friction model. However, this linear model is conservative to a certain extent. This paper describes a study to investigate the suitability of this model and other non-linear models representing soil-pipe interaction behavior. Lateral buckling analysis is conducted on a practical project and quantitative evaluation of these models has been made. A suggestion on the choice of these models is given.