| Mechanism of evolution on winter-time natural convection cooling effect of fractured-rock embankment in permafrost regions |
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| 作者姓名： | SUN Binxiang XU Xuezu LAI Yuanming WANG Shuangjie ZHANG Jinzhao |
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| 作者单位： | [1]Department of Civil Engineering, Shaoxing College of Arts and Sciences. Shaoxing 312000, China [2]State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [3]The First Highway Survey ＆ Design Institute, Ministry of Communications, Xi＇an 710068, China |
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| 基金项目： | Acknowledgements We would like to express our gratitude to the anonymous reviewers and editors for their valuable comments and improvements to this work. This work was supported by the National Science Fund for Distinguished Young Scholars of China （Grand No. 40225001） and the Technology Project of West Transportation Construction of the Ministry of Communications of China （Grand No. 200231800004）. |
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| 摘 要： | Recent researches indicate that the global climate really shows a warming trend1―5]. The Intergovernment Panel on Climate Change (IPCC) predicts a 1.4℃―5.8℃ rise in the global surface temperature between 1990 and 2100 using the climate change forecast model5]. During the same times, the climate in the Qinghai-Tibet Plateau will also bring about relevant changes. Recent predictions show that the air temperature of the Qinghai- Tibet Plateau will be a rise of 2.2℃―2.6℃ by 2050. Th…
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| 关 键 词： | 永久冻土区 青藏高原 气候变暖 破碎岩石路基 自然对流冷却 冬季 |
| 收稿时间： | 2005-06-27 |
| 修稿时间： | 2005-06-272005-08-18 |
Mechanism of evolution on winter-time natural convection cooling effect of fractured-rock embankment in permafrost regions |
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| SUN Binxiang XU Xuezu LAI Yuanming WANG Shuangjie ZHANG Jinzhao.Mechanism of evolution on winter-time natural convection cooling effect of fractured-rock embankment in permafrost regions[J].Chinese Science Bulletin,2005,50(23):2744-2754. |
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| Authors: | Sun Binxiang Xu Xuezu Lai Yuanming Wang Shuangjie Zhang Jinzhao |
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| Institution: | (1) Department of Civil Engineering, Shaoxing College of Arts and Sciences, 312000 Shaoxing, China;(2) State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 730000 Lanzhou, China;(3) The First Highway Survey & Design Institute, Ministry of Communications, 710068 Xi’an, China |
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| Abstract: | Mechanism and evolution of the pore-air natural convection cooling effect in fractured-rock embankments in permafrost regions are studied using a numerical representation of the non-dimensional governing equations in variable permeability porous media. The analyses show that winter-time natural convection in fractured-rock embankments begins to occur in the side slope portions and gradually develops from the left and right side slope portions to the middle portion of embankment. The more significant distortion of isotherms from their initial orientations due to heat conduction alone is that the cooling effect of winter-time natural convection on the fractured-rock embankment is stronger. The minimum critical Rayleigh numbers triggering natural convection of the pore-air in the side slope portions and the middle portion of embankment were obtained. The factors of influence on triggering winter-time convection cooling effect in fractured-rock embankments were analyzed. Finally, the assertion that the techniques of the fractured.rock revetment and berm are the effective measures to maintain the heat stability of the roadbed in permafrost regions is theoretically demonstrated. |
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| Keywords: | permafrost Qinghai-Tibet Plateau climate warming fractured-rock embankment natural convection |
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