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Numerical study on cooling effect of closed crushed-rock embankment along Qinghai-Tibet Railway in China

机译：中国青藏铁路沿线封闭碎石路堤降温效果的数值研究

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摘要

At present, crushed-rock embankment has been widely utilized as a method for avoiding thaw settlement of roadbed in the construction of Qinghai-Tibet Railway of China.The ballast layer and crushed-rock layer can be regarded as porous media in railway embankment. It is windy on the Qinghai-Tibet Plateau, so that the crushed-rock embankment is often covered by sand or snow on its surfaces and a special closed space is formed in its crushed-rock layer. In this paper, in order to research the cooling effect of crushed-rock embankment on the underlying permafrost under the closed condition, based on the special climatic and geological conditions of Qinghai-Tibet Plateau, a numerical representation of the unsteady two-dimensional continuity, momentum and energy equations of thermal convection for incompressible fluid in porous media is used to analyze the temperature characteristics of closed crushed-rock embankment for 50 years. The results indicate that, under the assumption that the air temperature will warm byrn2.6 ℃ in the future 50 years in the areas where the present mean annual airrntemperature is -4.0 ℃, when the crushed-rock embankment is covered by sand orrnsnow, it can still protect actively the underlying permafrost; However, with the augment of embankment height (embankment fill thickness on crushed-rock layer), its cooling effect becomes weak.
机译：目前，在我国青藏铁路建设中，碎石路堤已被广泛用作避免路基融化的方法，压载层和碎石层可被视为铁路路堤中的多孔介质。青藏高原多风，碎石路堤的表面经常被沙或雪覆盖，碎石层形成了一个特殊的封闭空间。本文基于青藏高原的特殊气候和地质条件，以非稳态二维连续性的数值表示为基础，研究密闭条件下碎石路堤对下伏多年冻土的冷却作用，利用多孔介质中不可压缩流体的热对流的动量和能量方程，分析了封闭碎石路堤50年的温度特征。结果表明，假设在未来50年内，在目前年平均气温为-4.0℃的地区，当碎石路堤被砂雪覆盖时，气温将升高2.6℃。仍可以积极保护潜在的多年冻土；但是，随着路堤高度的增加（碎石层的路堤填充厚度），其冷却效果变弱。

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