摘要
分析了开放系统和封闭系统块石试样内部的热传输机理。数值计算和实验结果都表明,在较大的表面温度波动条件下,封闭系统的块石试样中有一定的自然对流效应产生,其降温效应随时间具有累加性,但在试样上部分中热传导占支配地位,使得试样内温度波的振幅衰减与指数规律符合较好。因此,确定路堤、护坡块石的导热系数可以采用封闭系统的细长试样。
The heat transfer mechanism in the porous block stone specimens in closed-system and opened-system are analyzed. Both the numerical calculation and experimental results show that under the larger fluctuation of surface temperature, some natural convection effect will occur in the block stone specimen in closed system. And the cooling temperature effect has the accumulative property with time, but the heat transfer in the upper portion of specimen is dominated by the thermal conduction, so that the temperature wave amplitude attenuation in specimen is in accord with index law well. Therefore, the thermal conductivity of block stone for embankment and revetment can be determined using elongated specimens in closed-system.
出处
《土木工程学报》
EI
CSCD
北大核心
2004年第1期102-106,共5页
China Civil Engineering Journal
基金
中科院冻土工程国家重点实验室开放基金(200103)
中科院"百人计划"项目(赖远明)
中科院资源环境领域知识创新工程重要方向项目(KZCX2-306)
西部交通建设科技项目"多年冻土地区路基稳定性技术研究"
中科院寒区旱区环境与工程研究所知识创新工程项目(
关键词
寒区工程
块石路堤和护坡
多孔介质
自然对流
导热系数
cold region engineering
ballast embankment and revetment
porous media
natural convection
thermal conductivity
