Collapse and rockfall is one of the essential geological disasters that lead to the destruction of buried oil and gas pipelines.Stress and strain would be generated inside the pipeline when rockfall impacts,which may lead to pipeline deformation,damage,and leakage.And they pose a severe threat to people's lives and property.The authors established the finite element model of rockfall-soil-pipeline coupling by ABAQUS software and analyzed the mechanical response of rockfall impact on buried oil and gas pipelines.They studied the influence of engineering factors such as pipeline internal pressure,rockfall eccentricity,and rockfall impact velocity on pipeline stress and strain.The results show that:1)During the impact process,the pipe top is squeezed by the soil stress to the walls on both sides of the pipeline,and the maximum plastic strain appears at the edge of the pipeline depression,which is elliptical;2)With the decline of rockfall impact velocity and the increase of eccentricity,the stress change and deformation degree of pipeline decrease gradually;With the rise in internal pressure,the equivalent stress of the pipeline increases slowly while the pipeline strain decreases gradually.The results of the analysis reveal the physical nature and characteristics of rockfall impact pipelines and provide a theoretical basis for pipeline laying and engineering detection.
关键词
坍塌落石/油气管道/应力应变/数值模拟
Key words
collapse rockfall/oil and gas pipelines/stress and strain/numerical simulation
维普
万方数据