| 大孔隙空心块石层对流及降温过程试验 |
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| 引用本文： | 钱进,俞祁浩,蒋自强,谷伟,游艳辉.大孔隙空心块石层对流及降温过程试验[J].中国公路学报,2011(3). |
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| 作者姓名： | 钱进 俞祁浩 蒋自强 谷伟 游艳辉 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所;四川省交通运输厅交通勘察设计研究院; |
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| 基金项目： | 国家杰出青年基金项目(40625004); 国家基础科学人才培养基金项目(J0930003/J0109); 中国科学院西部行动计划项目(KZCX2-XB2-10) |
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| 摘 要： | 利用高精度微风速探测仪,通过室内模型试验首次获得了在大孔隙空心块石层内由温差引起的空气流速,并对空心块石层内的对流过程、降温过程及其相互关系进行了详细分析,而后结合实体工程分析了该措施的降温效能及优越性。结果表明:空心块石层降温效能突出且降温迅速,放热时间和吸热时间基本相当;空心块石层中对流速度显著,高达0.12 m.s-1,受到温度差异影响,在稳定区前后对流速度存在差异,最大相差0.023 m.s-1;温差是自然对流的驱动力,自然对流引起降温过程;不同传热方式及强度引起温度非对称性变化;对流速度和温差具有线性相关性,对流的发生存在起始温差;通过实体工程证实,空心块石层的降温效能相当突出,在1年中原冻土上限附近降温幅度达到0.3℃,路基内降温深度达到10 m。
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| 关 键 词： | 道路工程 空心块石层 室内模型试验 降温过程 对流过程 |
Experiment on Convective and Cooling Process of Macrovoid Hollow Concrete Brick Layer |
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| QIAN Jin,YU Qi-hao,JIANG Zi-qiang,GU Wei,YOU Yan-hui.Experiment on Convective and Cooling Process of Macrovoid Hollow Concrete Brick Layer[J].China Journal of Highway and Transport,2011(3). |
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| Authors: | QIAN Jin YU Qi-hao JIANG Zi-qiang GU Wei YOU Yan-hui |
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| Institution: | QIAN Jin1,2,YU Qi-hao1,JIANG Zi-qiang2,GU Wei1,YOU Yan-hui1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China,2.Sichuan Communication Surveying & Design Institute,Chengdu 610017,Sichuan,China) |
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| Abstract: | Using high-precision micro wind-speed detector,the air flow speed in macrovoid hollow concrete brick layer caused by temperature difference was got for the first time by indoor model test.The convection process,cooling process and their interactive influence relations in hollow concrete brick layer were studied in detail.Then,the cooling effect and superiority were analyzed by engineering practice.Results show that the cooling effect in experiment is obvious and cooling process is rapid.The exothermic time ... |
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| Keywords: | road engineering hollow concrete brick layer indoor model test cooling process convection process |
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