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首页> 外文期刊>Cold regions science and technology >Preliminary study on cooling effect mechanisms of Qinghai-Tibet railway embankment with open crushed-stone side slope in permafrost regions
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Preliminary study on cooling effect mechanisms of Qinghai-Tibet railway embankment with open crushed-stone side slope in permafrost regions

机译：多年冻土区裸石边坡开放式青藏铁路路堤降温效果机理初探

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摘要

The embankment with open crushed-stone side slope (EOCSSS) in permafrost regions is an effective measure to cool subgrade and protect permafrost along the Qinghai-Tibet railway. According to the air temperature condition and geological condition at Beiluhe Test Base on the Qinghai-Tibet Plateau, the numerical analyses for the temperature field, velocity field and heat flow of the EOCSSS at Beiluhe Test Base along Qinghai-Tibet railway were conducted both during daily period and annual period to study the mechanisms of the cooling effect of the EOCSSS in the present paper. The results show: (1) The EOCSSS has cooling effect during summer nighttime, which is different from the traditional views; (2) The open crushed-stone side slope has "heat shield" effect due to the solar shading during warm months and the EOCSSS releases more heat during cold months than that absorbed during warm months according to the results of the heat flow computed, which is beneficial for protecting permafrost beneath railway embankment and keeping thermal stability of the railway embankment; (3) The major type of heat transfer of crushed-stone side slope is the forced convection according to the velocity characteristics showed; (4) The main mechanisms of the cooling effect of the EOCSSS are the "heat shield" effect due to the solar shading of the crushed-stone side slope and the heat flow difference, which results from the velocity difference of the pore air in the open crushed-stone side slope during daily period and annual period.
机译：多年冻土区开有碎石侧坡的路堤是冷却青藏铁路沿线冻土和保护多年冻土的有效措施。根据青藏高原北麓河试验基地的气温条件和地质条件，对青藏铁路北麓河试验基地的EOCSSS的温度场，速度场和热流进行了数值分析。本文研究了EOCSSS降温效果的机理。结果表明：（1）EOCSSS在夏季夜间具有降温作用，与传统观点不同。 （2）根据计算出的热流结果，由于在温暖月份太阳遮阴，开放的碎石侧坡具有“隔热”作用，并且EOCSSS在寒冷月份释放的热量大于温暖月份吸收的热量。有利于保护铁路路堤下面的多年冻土，并保持铁路路堤的热稳定性。 （3）碎石边坡传热的主要类型是根据所显示的速度特性进行的强制对流； （4）EOCSSS冷却效果的主要机制是碎石侧坡的日光遮蔽和热流差引起的“热屏效应”，这是由孔隙中空气速度差引起的。在日常和年度期间开放碎石边坡。

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