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《Journal of Glaciolgy and Geocryology》 2002-06
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3D Nonlininear Analyses for Temperature Field of Ventilative Embankment in Cold Regions

MI Long 1, LAI Yuan ming 2, ZHANG Ke hua 3(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)  
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 4 000 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
【Fund】: 国家杰出青年科学基金项目 ;中国科学院“百人计划”资助项目;; 中国科学院知识创新工程重大项目 (KZCX1 SW 0 4 );; 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 10 0 13)资助
【CateGory Index】: U213.14
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