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首页> 外文期刊>Progress in Natural Science: Communication of State Key Laboratories of China >Heat transfer process of roadway embankments with different type and width of road surface in permafrost regions
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Heat transfer process of roadway embankments with different type and width of road surface in permafrost regions

机译：多年冻土区不同类型和宽度路面的路堤传热过程

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摘要

The stability of roadbed in permafrost areas has become a big concern with rapid development and construction of throughways, highways and railways in these areas under the current climate change since it is governed by the thermal condition, or in other words, the heat transfer process in the embankment. We carried out a finite element analysis to analyze the effects of different types of road surface and the effect of breadth of embankment on the embankment heat transfer process. The results indicated that the mean annual heat transfer rate at the bottom of the roadway embankment with asphalt surfaces is 3 times that with sandy gravel surfaces. This means annual heat transfer rate increased by 60% when the breadth of asphalt surface was doubled. The increased heat transfer rate was mainly located at the bottom of the embankment and resulted in the effect of thermal concentration, leading to degradation of the permafrost by as much as 1.6 times. It was also found that increasing embankment height would not reduce these increases of the heat transfer rate. Therefore both asphalt road surface and increased embankment breadth can lead to an intensified heat transfer rate in roadway embankment, consequently degradating the underlying permafrost and embankment instability.
机译：在当前气候变化的情况下，多年冻土区路基的稳定性已成为这些地区快速发展和建设公路，公路和铁路的主要问题，因为它受温度条件或换句话说就是热传递过程的控制。路堤。我们进行了有限元分析，以分析不同类型的路面和路堤宽度对路堤传热过程的影响。结果表明，沥青路面巷道底部的年平均传热速率是砂砾石路面的3倍。这意味着当沥青表面的宽度加倍时，年传热率提高60％。增加的传热速率主要位于路堤的底部，并导致热集中的影响，导致永久冻土的退化高达1.6倍。还发现增加路堤高度不会减少传热速率的这些增加。因此，沥青路面和路堤宽度的增加都会导致路堤传热速率的增加，从而降低了潜在的多年冻土和路堤的不稳定性。

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