The geological environment along a buried pipeline in permafrost regions is complex, where differential frost heave often occurs. To understand the changes in the stress behavior of pipeline structures caused by corrosion while laying them in permafrost regions, we established a thermo-mechanical coupling model of buried pipeline with corrosion defects by using finite element software. Numerical simulation analysis of buried pipeline was conducted. The effects of the frost heave length, the length of the transition section, the corrosion depth, and the corrosion length on the stress displacement were obtained. These analyses showed that the stresses and displacements of the pipeline with corrosion defects in permafrost regions can be simulated by using the finite element software numerical simulation method. Afterward, the corrosion resistances of pipelines with different corrosion lengths and depths were investigated via an electrochemical testing method. These results can provide some useful insights into the possible mechanical state of buried pipeline with regard to their design and construction, as well as some useful theoretical references for simulating real-time monitoring and safety analysis for their operation in permafrost regions.

中文翻译：

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永久冻土区腐蚀缺陷埋地管道的力学模拟和电化学腐蚀

多年冻土区埋地管道沿线地质环境复杂，常出现差异冻胀现象。为了解管道结构在多年冻土区敷设过程中腐蚀引起的应力行为变化，利用有限元软件建立了具有腐蚀缺陷的埋地管道热力耦合模型。对埋地管道进行了数值模拟分析。得到了冻胀长度、过渡段长度、腐蚀深度和腐蚀长度对应力位移的影响。这些分析表明，利用有限元软件数值模拟方法可以模拟多年冻土区腐蚀缺陷管道的应力和位移。之后，通过电化学测试方法研究了不同腐蚀长度和深度的管道的耐腐蚀性。这些结果可以为埋地管道的设计和施工可能的力学状态提供一些有用的见解，并为在多年冻土区运行的模拟实时监控和安全分析提供一些有用的理论参考。