| 冻土通风路基温度场的三维非线性分析 |
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| 引用本文： | 米隆,赖远明,张克华.冻土通风路基温度场的三维非线性分析[J].冰川冻土,2002,24(6):765-769. |
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| 作者姓名： | 米隆 赖远明 张克华 |
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| 作者单位： | 1. 北方交通大学, 土木工程学院, 北京, 100044;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;3. 兰州铁道学院土木建筑学院, 甘肃, 兰州, 730000 |
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| 摘 要： | 应用有限元方法,对一通风路基的温度特性进行了三维数值分析.该路基在离天然地面1m铺有管径为0.4m的通风管,通风管之间的距离为2m,所在地区年平均气温为-3.5℃,年温较差24℃.数值分析表明,通风路基能使其下面的融化盘减小,最大融化深度减小,0℃等温上移.该现象说明通风路基有对冻土制冷的作用,能达到降低冻土路基温度,保证冻土路基稳定的目的.
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| 关 键 词： | 冻土通风路基 温度特性 三维非线性分析 |
| 文章编号： | 1000-0240(2002)06-0765-05 |
| 收稿时间： | 2002-06-04 |
| 修稿时间： | 2002年6月4日 |
3D Nonlininear Analyses for Temperature Field of Ventilative Embankment in Cold Regions |
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| MI Long ,LAI Yuan ming ,ZHANG Ke hua.3D Nonlininear Analyses for Temperature Field of Ventilative Embankment in Cold Regions[J].Journal of Glaciology and Geocryology,2002,24(6):765-769. |
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| Authors: | MI Long LAI Yuan ming ZHANG Ke hua |
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| Institution: | 1. The Faculty of Civil Engineering, Northern Jiaotong University, Beijing 100044, China;2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China;3. The Faculty of Civil Engineering, Lanzhou Railway Institute, Lanzhou Gansu 730000, China |
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| Abstract: | In this paper, a ventilative embankment with pipes inside is proposed. Pipes, 0.4 m in diameter, are put 1 m above the native ground surface. The distance between two pipes is 2.0 m. The embankment is located at an elevation of 4000 m. A diagram of the ventilative embankment is shown in Figure 1. As a result, temperatures at the native surface and air-contact surface, temperatures at gravel side slopes and temperature at pavement surface all can be described as a sine function. The geothermal heat flux at boundary is given. This embankment is composed of four parts: Part I is ballast; Part II is gravel and grit; Part III is sub-clay; Part IV is weathering metamorphic schist. Using finite element method, 3D-nonlinear analyses of the properties of the ventilative embankment are made. The numerical results indicate that ventilative embankment is able to shrink its thawing zone, to reduce the maximum thawing depth and to uplift the 0℃ iso-temperature. This phenomenon illuminates that ventilative embankment can cool the permafrost beneath, reduce the temperature of permafrost embankment and ensure its thermal stability |
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| Keywords: | ventilative embankment in cold regions thermal property 3D-nonlinear analysis |
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