In order to study the characteristics of pipeline failure in frozen soil area,the safety of oil and gas pipelines was ensured,and the finite element analysis method and theoretical calculation method were used to study the classification of cold soil structure,analysis of oil and gas pipeline failure factors and Tube-soil interaction analysis,analysis of temperature field around permafrost,longitudinal temperature field distribution of oil and gas pipelines,etc.The simulation results show that the maximum compressive stress occurs at a distance of 67.5 m (from the right 2.5 m);the maximum tensile stress occurs at a distance of 61.5 m(3.5 m from the interface).For different thickness of permafrost,should take appropriate measures to avoid the occurrence of frost heave and melting phenomenon,so as to better guide the design of frozen soil pipeline,construction and maintenance.%为了确保油气管道在冻土区的安全铺设,采用ANSYS有限元分析法以及理论计算的方法,对冻土区的管道破坏特征进行研究,研究了冻土的冷生构造分类、油气管道失效因素以及管—土相互作用、管道周围冻土温度场,油气管道的纵向温度场的分布等.研究得出:随着深度的增加,各点土层的最低温度逐渐变小,最高温度逐渐变大,符合低温变化规律;不同深度处地温随大气变化情况符合正弦周期变化,而且随着深度增加,各曲线振幅随深度增加,出现衰减.模拟可知,最大压应力发生在距离67.5 m(分界面距右2.5m处)处的管顶;最大拉应力发生在距离61.5 m(分界面距左3.5m处)处的管顶.对于不同厚度的冻土,应采取相应措施,避免冻胀与融沉现象的发生,从而更好的指导冻土区管道的设计、施工以及维护.
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