| 封闭、开放边界条件下冻土抛石护坡路堤数值模拟比较研究 |
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| 引用本文： | 姜凡,刘石,刘靖.封闭、开放边界条件下冻土抛石护坡路堤数值模拟比较研究[J].冰川冻土,2007,29(5):746-751. |
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| 作者姓名： | 姜凡 刘石 刘靖 |
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| 作者单位： | 中国科学院,工程热物理研究所,北京,100080;中国科学院,工程热物理研究所,北京,100080;中国科学院,工程热物理研究所,北京,100080 |
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| 基金项目： | 中国科学院知识创新工程重大项目(KZCX-1-SW-04)，国家自然科学基金项目(40501017)资助 |
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| 摘 要： | 采用"块石模型"对青藏铁路抛石护坡路堤进行封闭边界条件和开放边界条件下的数值模拟计算,并对结果进行了比较分析.研究表明:在封闭边界条件下,冬季抛石层内部空气的运动趋势为冷空气下渗占据主导地位,夏季空气的主要运动方向为沿斜坡向上,其综合效果有利于路堤保冷.当采用开放边界条件时,抛石层内部的空气运动主要受到外界环境的影响,路堤内的温度场在很大程度上取决于环境温度的变化.因此,抛石层的铺设对于路堤的保冷效果没有封闭边界条件下明显和有效.
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| 关 键 词： | 开放边界 封闭边界 抛石护坡 数值模拟 多年冻土 |
| 文章编号： | 1000-0240（2007）05-0746-06 |
| 修稿时间： | 2007-01-19 |
Numerical Simulations of the Ballast Revetment under Closed and Open Boundary Conditions |
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| JIANG Fan,LIU Shi,LIU Jing.Numerical Simulations of the Ballast Revetment under Closed and Open Boundary Conditions[J].Journal of Glaciology and Geocryology,2007,29(5):746-751. |
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| Authors: | JIANG Fan LIU Shi LIU Jing |
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| Institution: | Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Numerical simulations of ballast revetment under the closed and open boundary conditions are conducted using the "gravels model",in which the embankment is composed of stones and air.The simulation results are analyzed comparatively.The results show that in winter the pore-air of the ballast revetment mainly flows downward,whereas,in summer the upward pore-air flow is dominant in the embankment.The total effect within the year is thus to cool the embankment in a long run.If the open boundary conditions are adopted,the velocity fields and the corresponding temperature profiles of the embankment are mainly influenced by environment.Therefore,when simulating the ballast revetment,the cooling effect under open boundary conditions is not more evident and effective than that under the closed boundary conditions. |
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| Keywords: | open boundary: closed boundary: ballast revetment: numerical simulation: permafrost |
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