临近冲击载荷的埋地聚乙烯燃气管道有限元分析

运用Abaqus有限元分析软件，构建冲击作用下管土相互作用有限元分析模型，分析聚乙烯管道的应力变化，研究聚乙烯管道的材料模型、土体性能、冲击速度对聚乙烯管应力及变形的影响规律。结果表明，由于冲击作用时间较短，冲击速度对聚乙烯管道没有明显影响；管道覆土的性质及埋深对管道有明显的保护作用；聚乙烯管道的最大应力随着聚乙烯管道内压的增大而增大，近似成线性关系；在冲击载荷作用下，距离冲击区域越近的聚乙烯管道越容易达到强度失效极限；研究结果可以为埋地聚乙烯燃气管道的安全运行及第三方施工活动提供技术支持。

Finite Element Analysis of Buried Polyethylene Gas Pipeline Near Impact-loading Zone

To analyze the effect of impact load on the safe operation of buried polyethylene gas pipelines near the impact loading zone, a finite element analysis software ABAQUS was used to analyze the stress variation of polyethylene pipe with the pipe-soil interaction finite element model. The variation of stress and deformation was analyzed with different polyethylene pipe material models, soil properties and impact velocity. The results indicated that the impact velocity of polyethylene pipeline did not show any change due to the impact with relatively short time. There was a significant protective effect on the pipeline from the soil properties and reasonable burying depth. The polyethylene pipeline exhibited an increase in maximum stress with an increase of internal pressure of the pipe, which has an approximately linear relationship. The area near the impact zone was found to reach a failure limit easily for polyethylene pipe.