Abstract: In view of the fact that the buried pipeline design does not fully consider the stress changes during the operation process of the pipeline subjected to frost heaving and corrosion, considering the complex working conditions of the buried pipeline containing corrosion in the frozen soil area, the deformation and damage of the buried pipeline in the frozen soil area are analyzed. Factors, the establishment of a finite element model suitable for buried pipelines in frozen soil areas, study the impact of environmental temperature, corrosion depth and length on pipeline stress changes. The results show that the effect of frozen soil on corroded pipelines is mainly divided into elevation and end tensile stress. The elevation and stress increase the stress and strain of the corrosion pipeline linearly, but the effect of end tensile stress is opposite; the stress strain of the pipeline is directly proportional to the square of the corrosion depth. The increase of the corrosion length leads to a sharp increase in the stress and strain of the pipeline. When the length is greater than 150 mm, the mechanical properties of the pipeline fluctuate within a certain range. It provides a new idea and method for the design of buried pipelines in permafrost areas.

Key words: Permafrost area, Corroded pipeline, Stress?strain, Finite element analysis

摘要： 针对埋地管道设计未充分考虑作业过程中管道受冻胀和腐蚀作用时的受力变化情况，根据冻土区埋地腐蚀管道的复杂性，以及冻土区埋地管道受力变形破环因素，建立适用于冻土区埋地腐蚀管道的有限元模型，研究了环境温度、腐蚀深度和长度等因素对管道应力的影响。结果表明，影响冻土对腐蚀管道作用的因素主要为抬升高度及端部拉应力，抬升高度导致腐蚀管道的应力及应变线性增加，但端部拉应力的作用效果与其相反；管道的应力应变与腐蚀深度的二次方成正比，腐蚀长度的增加导致管道应力及应变先急剧增加，且长度大于150 mm时，管道力学性能在一定范围内小幅波动。研究结果可为冻土区埋地管道的设计提供一种新的思路和方法。

关键词: 冻土区, 含腐蚀管道, 应力应变, 有限元分析