摘要
将块径为 6～ 8cm、4～ 6cm和 2～ 4cm的块石分别装入直径为 15cm、高度为 5 9cm的有机玻璃筒内 ,进行了边界温度周期波动条件下块石体中一维温度场的测试 ,以考察多孔块石体中温度变化规律。试验表明 ,开放系统条件下 ,块石体温度随时间变化具有不对称性 ;温度随深度变化不符合基于热传导理论的傅立叶第一定律 ,具有迟缓性 ;块石体中的平均温度经过几个周期会低于其表面平均温度 ,说明其中存在对流换热机制。封闭系统条件下 ,三种块径的块石体的温度变化均无上述规律 ,表明其中对流换热机制尚不存在或十分微弱。
The one dimensional tests were carried on the ballasts with diameters of 6～8 cm,4～6 cm and 2～4 cm in the plexiglass cylinder of 15 cm in diameter and 59 cm in height under periodical fluctuation of boundary temperature to investigate the variation of temperature in the ballasts. Results show that the temperature changes of ballast are unsymmetrical with time and the temperature attenuation is slow with depth and the mean temperature of ballasts is always lower than that on the surface under condition of open system. It implies that there exist two mechanisms of conduction and convection for heat exchanging in ballasts. Inversely, there are no such variation of temperature under condition of closed system. It means heat conduction may be the only mechanism in the test specimen of the designed sizes.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2003年第1期91-95,共5页
Chinese Journal of Geotechnical Engineering
基金
中国科学院冻土工程国家重点实验室开放基金资助项目 (2 0 0 1 0 3)
中国科学院"百人计划"资助项目 (赖远明 )
中国科学院资源环境领域知识创新工程重要方向项目 (KZCX2 -30 6)
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(CACX2 1 0 0 1 5)
