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深埋藏的天然气管线与周围因冻胀性差异发生位移的冻土之间的相互关系已经引起关注。本文介绍了一种在实验室检测的基于冻土地带抗拔阻力递减对不同冻胀作用下的管线进行模拟的半定量方法。非线性的应力应变预测结果与有限元分析方法结果取得了很好的一致。采用一种参数研究方法来分析那些可以改变冻土地带抗拔阻力的关键因素。相比很多种此类方法,最终发现剩余阻抗是影响管线应力应变的一个很重要的参数。
The interrelationship between deep-buried natural gas pipelines and permafrost that is displaced by the difference in frost heave around it has drawn attention. This paper presents a semi-quantitative method for simulating pipelines under different frost heavedays, which is based on the laboratory test of decreasing descending resistance of frozen soil zone. The nonlinear stress-strain prediction results are in good agreement with the finite element analysis results. A parametric approach is used to analyze the key factors that can change the resistance to pullback in frozen terrain. Compared with many kinds of such methods, the final finding of residual impedance is a very important parameter that affects the stress and strain of pipeline.