基于多年冻土层冷却功率需求的块石气冷路基设计方法  

Design method of air-cooled embankment based on permafrost cooling power demand

作　　者：袁堃[1,2] 章金钊[1,2] 刘戈[1] 符进 朱东鹏[1,2] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《长安大学学报（自然科学版）》2015年第5期35-42,72,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：国家科技支撑计划项目(2014BAG05B07;2014BAG05B03);国家重点基础研究发展计划项目(2012CB026106);中交集团科技研发项目(2011-ZJKJ-16)

摘　　要：为了建立1套简明实用的块石气冷路基设计方法,以多孔介质自然对流换热理论为基础,建立了块石气冷路基数值计算模型,计算了不同路基高度和不同块石层厚度条件下的冻土热量收支情况,在此基础上分析了冻土上限变化与冻土层冷却功率需求的关系、块石层厚度与块石气冷路基冷却功率的关系,以及路基高度对块石路基冷却功率的影响;对不同工况的计算结果回归拟合出块石路基冷却功率计算公式,结合工程实际提出完整的块石气冷路基设计方法,并给出了参考算例。研究结果表明：块石层内的空气自然对流主要发生在冷季中的1~4月之间;相同路基高度情况下,块石层厚度越大,块石气冷路基冷却功率越大,而在相同块石层厚度情况下,块石层冷却功率随路基高度增加而减少;该研究成果可为多年冻土地区公路块石气冷路基的设计提供参考。To establish a concise and practical design method for air-cooled embankment, a numerical simulation model of air-cooled embankment was established based on the theory of natural convection in porous media, and the heat budget of permafrost was calculated under different embankment heights and different crashed rock thickness conditions. On this basis, the relationship between permafrost table change process and cooling power demand, the relation between crashed rock thickness and cooling power, and the effect of embankment height on aircooled embankment were analyzed. The fitting formula of cooling power of air-cooled embankment was obtained by the regression of different calculation condition results, a design method for air-cooled embankment was proposed, and an engineering practical example was presented. The results show that the natural convection occurs in January to April of cold season, and the cooling power of air-cooled embankment increases with the increase of crashed rock thickness, in case of the same embankment height. In case of the same crashed rock layer thickness, the cooling power of air-cooled embankment decreases with the increase of embankment height. The research can provide a reference for design of the air-cooled embankment of highway in permafrost regions. 5 tabs, 10 figs, 22 refs.

关 键 词：道路工程 设计方法 数值模拟 块石气冷路基 多年冻土 

分 类 号：U419.92[交通运输工程—道路与铁道工程]