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首页> 外文期刊>European Journal of Environmental and Civil Engineering >Thermal-moisture dynamics of embankments with asphalt pavement in permafrost regions of central Tibetan Plateau
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Thermal-moisture dynamics of embankments with asphalt pavement in permafrost regions of central Tibetan Plateau

机译：青藏高原中部多年冻土区沥青路面路堤的热湿动力学

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摘要

Subsurface moisture content is one of the critical factors that control the thermal dynamics of embankments. However, information on the subsurface moisture movement and distribution in embankments is still limited. To better understand the coupled water and heat transport within embankments, subsurface temperature and moisture of an asphalt pavement highway were extensively measured from 2009 to 2011. Collected data indicate that pure heat conduction is the overall main mechanism of heat transport in the embankment and heat convection plays a relatively unimportant role in heat transport. The results also indicate that subsurface moisture and temperature dynamics in the asphalt layer is strongly related to the rainfall events, while the subsurface moisture content below the road base course maintains relatively constant. Rainfall in summer leads to rapid cooling of the subsurface soil. Our results suggest that frequent and small rainfall events favour the thermal stability of the embankment due to the loss of latent heat of water evaporation. Moisture migration during freezing still occurred in the gravel fill and the water infiltrated into the active layer during thawing period. Freezing-induced water migration may result in the increase in water content of the embankment and the decrease in compactness of gravel fill.
机译：地下含水量是控制路堤热力学的关键因素之一。但是，关于路堤地下水分运动和分布的信息仍然有限。为了更好地了解路堤内水和热的耦合传递，从2009年到2011年对沥青路面的地下温度和湿度进行了广泛的测量。收集的数据表明，纯热传导是路堤和对流热传递的总体主要机制。在热传递中起着相对不重要的作用。结果还表明，沥青层中的地下水分和温度动态与降雨事件密切相关，而道路基层以下的地下水分含量则保持相对恒定。夏天的降雨导致地下土壤迅速冷却。我们的结果表明，由于水分蒸发潜热的损失，频繁而少雨的天气有利于路堤的热稳定性。冻结过程中的水分迁移仍然发生在砾石填充物中，并且在融化期间水渗透到活性层中。冻结引起的水迁移可能导致路堤含水量增加和砾石填充的致密性降低。

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