非均匀冻胀对埋地管道结构安全性的影响

摘要

In order to timely understand the changes of the structural characteristics during the pipeline operation,the solutions that buried pipeline under the condition of nonuniform frost heaving had been drawn by the theory of beam on elastic foundation.Using ADINA,which is a finite element software,es-tablished three-dimensional model and completed the thermo-mechanical coupled analysis.Through the calculation the pipeline frost heaving force after freezing and thawing cycle,it is concluded that the influ-ences of the temperature,pipeline buried depth and transition segment length on the pipeline stress and strain,and position of the pipeline largest stress is determined.%为及时了解冻土区管道运营期间结构受力性状的变化，利用弹性地基梁理论得出了埋地管道在土体不均匀冻胀情况下的解答。应用有限元软件ADINA建立了三维模型，并且对埋地管道进行了热力耦合分析。通过计算冻融循环后管道的冻胀力，得出了温度、管道埋深、过渡段长度对管道应力应变的影响，确定了管道受力最大的位置。