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《Journal of Glaciology and Geocryology》 2003-06
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Experimental Study on Thermal Conductivity of Railway Ballast

ZHANG Jian-ming, SHENG Yu, LAI Yuan-mingansu 730000, China)  
In this paper, the thermal conductivity of railway ballast is measured by steady comparison method. The experiment was carried out at room temperature and two thermal conditions, heated from below and from above, were studied. The test results show that the thermal conductivity of the railway ballast is almost the same for the two thermal conditions when the temperature difference between the top and bottom of the ballast is smaller. When the temperature difference of the ballast is larger, however, the thermal conductivity for the condition of being heated from below is greater than that of being heated from above. Moreover, under the condition of being heated from below, the thermal conductivity increases with increasing temperature difference between the top and bottom of the ballast. It means that the heat transfer in the railway ballast is dissymmetric for the two thermal conditions. For the engineering of railway construction in cold regions, it is hoped that the permafrost under the railway embankment can be protected and reinforced if this advantage of heat transfer in railway ballast is taken.
【Fund】: 中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX210071);; 中国科学院"百人计划"项目;; 铁道部科技开发计划项目(2001G001 A 02);; 中国科学院知识创新工程重大项目(KZCX1 SW 04)资助
【CateGory Index】: P642.14
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