海底混凝土配重层单层管受落物冲击损伤因素分析

Analysis of damage factors of single-layer pipe in submarine concrete weight coating under impact of falling objects

对混凝土配重层单层管在落物冲击载荷作用下的屈曲破坏进行重点研究,将数值模拟结果与全尺寸管道撞击试验结果进行对比,验证仿真模型的准确性。基于上述模型,分析碰撞过程中能量变化情况及管道的最大Mises应力,并将碰撞过程分为三个阶段。针对混凝土配重层单层管受落物冲击载荷作用的情况,计算了外压作用下的管道受落物冲击载荷作用后产生的凹坑深度与混凝土配重层和单层管之间的吸能关系;在此基础上,对撞击能量、落物形状、管道埋深、运行压力、管道径厚比和混凝土配重层厚度等敏感性因素进行参数化分析,分析管道凹坑深度及配重层吸能随上述参数的变化趋势。

The buckling failure of a single-layer pipe in concrete weight coating under the impact load of falling objects was mainly studied in this paper.The numerical simulation results were compared with the results of full-scale pipeline impact tests to verify the accuracy of the simulation model.According to the above model,the energy change and the maximum Mises stress of the pipeline during the collision were analyzed,and the collision was divided into three stages.In view of the single-layer pipe in the concrete weight coating under the impact load of falling objects,the energy absorption relationship between the pit depth and the concrete weight coating and single-layer pipe was calculated after the pipeline was subjected to the impact load of the falling objects under the external pressure.On this basis,sensitivity factors such as impact energy,falling object shape,pipeline buried depth,operating pressure,pipeline diameter-to-thickness ratio,and concrete weight coating thickness were processed through parametric analysis,and the variation trend of pipeline pit depth and weight coating energy absorption with the above parameters was analyzed.