Cooling permafrost embankment by enhancing oriented heat conduction in asphalt pavement
Cooling permafrost embankment by enhancing oriented heat conduction in asphalt pavement
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DOI：
10.1016/j.applthermaleng.2016.04.115
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发表时间：
2016-06
影响因子：
6.4
通讯作者：
Du Yinfei;Wang Shengyue;Wang Shuang-jie;C. Jianbing
中科院分区：
文献类型：
--
作者：
Du Yinfei;Wang Shengyue;Wang Shuang-jie;C. Jianbing
本文提出了一种通过控制沥青路面的定向传热来减少多年冻土路基热量积累的新方法。以夏季日吸热量和年净蓄热量为指标，设计了两种高度定向的热诱导结构：G-OHIS（单一梯度导热系数）和G+R-OHIS（梯度导热系数和热反射层组合）。结果表明，夏季G-OHIS和G+R-OHIS的吸热量分别减少了9.9%和23.2%。路堤顶部的年净热量累积减少了6.2%的G-OHIS和37.9%的G+R-OHIS。此外，夏季日平均气温的顶部G-OHIS和G+R-OHIS的分别降低了0.74 °C和1.66 °C。G-OHIS和G+R-OHIS的路堤顶部年温差分别减小了1.07 °C和1.96 °C。室内辐照试验验证了G-OHIS降低路面温度的有效性。通过控制沥青路面中的定向传热，可以减少冻土融化及冻土融化引起的路面病害。
In this paper, a new method was proposed to decrease the heat accumulation in permafrost embankment by controlling an oriented heat transfer in asphalt pavement. Two highly oriented heat-induced structures, named G-OHIS (only gradient thermal conductivity) and G+R-OHIS (combined gradient thermal conductivity and heat reflective layer), were designed by using two indexes of summertime daily heat absorption and annual net heat accumulation on the top of embankment. The results showed that the heat absorptions on the top of embankments of the G-OHIS and G+R-OHIS in summer decreased by 9.9% and 23.2% respectively. The annual net heat accumulation on the top of embankment decreased by 6.2% for the G-OHIS and 37.9% for the G+R-OHIS. Moreover, the summertime mean daily temperatures on the top of embankments of the G-OHIS and G+R-OHIS reduced by 0.74 °C and 1.66 °C respectively. The annual temperature difference on the top of embankment reduced by 1.07 °C for the G-OHIS and 1.96 °C for the G+R-OHIS. The effectiveness of the G-OHIS in reducing pavement temperature was validated by an indoor irradiation test. It is expected to reduce permafrost thawing and other pavement distresses caused by permafrost thawing by controlling an oriented heat transfer in asphalt pavement.