船舶抛锚对浅水区埋置管道的损伤分析

Analysis of Impact on Submarine Buried Pipelines from Dropped Anchor in Shallow Water

针对浅水区海底埋置管道受船锚冲击后的安全性问题,提出重力式抛锚作业船锚下落速度的计算方法,应用ABAQUS有限元软件建立数值模型,采用CEL方法模拟船舶抛锚撞击埋置管道的动态过程,分析抛锚水深、船锚入泥角度以及管道埋置深度对管道受船锚撞击的损伤影响。结果表明,给定型号的船锚抛锚水深小于船锚达到平衡速度的水深时,海底管道受船锚撞击的损伤程度随抛锚水深增加而增大;船锚入泥角度超过15°后,抛锚撞击管道的损伤程度随入泥角度增大而减小;海底管道受船锚撞击的凹陷深度随管道埋置深度增加成反比关系。

In order to investigate safety of submarine buried pipelines in shallow water,which may be impacted by dropped anchors,a method to calculate the anchor velocity was developed for the anchor dropped in water under gravity. Based on the CEL method,the finite element model was established using ABAQUS to simulate the impact process of anchor on buried pipeline. The damage of the buried pipeline from anchor impacting was analyzed,considering the effect of water depth,the penetration angle of anchor and the buried depth of pipeline. The results showed that for the given anchor the degree of pipeline damage increases with water depth before the anchor reaching the terminal speed. When the anchoring penetration angle is more than15°,the degree of pipeline damage decreases with the increase of penetration angle,and the dent of pipeline has an inverse relationship with the increase of buried depth.