冻土区埋地管道正温输送应力应变分析

Analysis on Stress and Strain of Buried Pipeline with Positive temperature Conveying Process in Frozen Soil

我国作为世界三大冻土国之一,近一半国土含有不同种类的冻土,在油气管道的敷设过程中冻土问题不可避免,因此研究在冻土区敷设的管道十分重要。冻土区管道受温度影响较大,从而对管道力学性能产生影响。因此,借助ANSYS有限元软件,对正温输送的冻土区管道进行数值模拟研究,以便得出冻土区管道应力应变变化规律。首先考察常见的内压对管道的应力影响,然后通过改变管道保温层厚度和正温输送温度等影响因素,考察这几种条件下对管道的最大Von Mises应力和轴向应变影响,所得结论对冻土区管道在输送温度及保温层选择上提供一定依据。

As one of three largest frozen soil countries in the world,China has different types of frozen soil covering almost half of the land area.During the laying of oil and gas pipelines,the problem of frozen soil is inevitable.Therefore,it is important to study the pipelines laid in frozen soil.Pipes in the frozen soil area are greatly affected by temperature,which affects the mechanical properties of the pipes.Therefore,with the help of ANSYS finite element software,the numerical simulation of the pipeline with positive temperature conveying process in the frozen soil was carried out in order to obtain the stress-strain variation of the pipeline in the frozen soil.First,the effect of internal pressure on the stress of the pipeline was investigated,and then the influences of the thickness of the thermal insulation layer and the transportation temperature on Von Mises stress and axial strain of the pipeline were investigated.The research results can provide a certain basis on the selection of transportation temperature and insulation layer.