冻土区碎石路基对流降温的研究  

Study on Convection Cooling of the Crushed Rock in Cold Regions

作　　者：刘新龙[1] 王霞[1] 符敏[1] 

机构地区：[1]西安工业大学建筑工程系,西安710032

出　　处：《西安工业大学学报》2006年第6期587-590,共4页Journal of Xi’an Technological University

摘　　要：为了研究碎石层保护冻土地区路基的效果,将碎石路基视为多孔介质,从多孔介质对流理论出发,用Bear J摄动法推导了自然对流的发生条件,总结和分析了冷却地基研究成果,就青藏地区的冻土和气候条件,讨论了碎石路基的铺设厚度和粒径,计算厚度为0.96米,并指出了所亟待解决的问题.In order to study the effect of crushed rock maintaining permafrost embankment, here, the crushed rock embankment is treated as porous media. The discussion starts with the theory of the convection of porous media; and the formula for the nature convection is deduced by Bear J perturbation methal; and then based upon summarizing the research findings of the cooling mechanism of the crushed rock embankment, the thickness （0.96 m） and grain size for the crushed rock embankment is achieved according to the natural condition of Qinghai-Tibet Plateau; lastly, the urgent questions about this sort of embankment are showed.

关 键 词：碎石路基 永冻区 对流 多孔介质 热弥散 

分 类 号：U416.214[交通运输工程—道路与铁道工程]