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The Frost Heave Calculation of Permafrost Pipeline

机译:多年冻土管道冻胀计算

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Frost heave is the primary factor for potential destruction of the permafrost pipeline.rnConsidering the Fenghuoshan area of the Ge-La Pipeline, the paper develops thernfinite element model for frost heave, and determines the amount of frost heave, frostrnstress around the pipe and Von Mises equivalent stress of the pipe wall, based uponrnthe coupled thermo-mechanical method. The results indicate that the direction ofrnfrost heave is essentially vertical; the maximum frost stress occurs in the soilrnadjacent to the central section of the pipe, and the maximum Von Mises equivalentrnstress occurs at the top of the pipe. Based on a sensitivity analysis, the frost stressrnand Von Mises equivalent stress diminish with an increase of trench width and buriedrndepth. The relationship between the frost stress and Von Mises equivalent stress andrnthe pipe diameter and trench obliquity is rather complex. The frost stress valuernreaches a peak when the diameter is 150mm, and the Von Mises equivalent stressrnvalue reaches a peak when the trench obliquity is 10 degrees. The above results andrnmethods have important significance for the design and construction of a permafrostrnpipeline.
机译:冻胀是永久冻土管道潜在破坏的主要因素。rn考虑到葛拉管道的风火山山地区,本文建立了冻胀的有限元模型,并确定了冻胀的量,管道周围的冻应力和冯·米塞斯基于热力学耦合方法的管壁等效应力。结果表明,霜冻胀大的方向基本垂直。最大的霜冻应力发生在与管道中心部分相邻的土壤中,最大的冯·米塞斯当量应力发生在管道的顶部。根据敏感性分析,霜冻应力和冯·米塞斯等效应力随着沟槽宽度和埋深的增加而减小。霜冻应力与冯·米塞斯当量应力,管径和沟槽倾角之间的关系相当复杂。当直径为150mm时,霜应力值达到峰值,而当沟槽倾角为10度时,冯·米塞斯等效应力值达到峰值。以上结果和方法对多年冻土管道的设计和施工具有重要意义。

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