| Thermal Characteristics of the Embankment with Crushed Rock Side Slope to Mitigate Thaw Settlement Hazards of the Qinghai-Tibet Railway |
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| 作者姓名： | LI Guoyu MU Yanhu and ZHANG Xia |
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| 作者单位： | 1 State Key Laboratory of Frozen Soil Engineering, CAREERI, Chinese Academy of Science, Lanzhou 730000, China; 2 School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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| 基金项目： | The present work was supported by the National Natural Science Foundation of China (Grant Nos 40801022 and 40821001), the Chinese Academy of Sciences (CAS) Knowledge Innovation Key Directional Program (Grant Nos KZCX2-YW-Q03-04 and KZCX2-YW-311), CAS Western Project (Grant No. KZCX2-XB2-10), China Postdoctoral Science Foundation (No. 20080430110), CAS 100-Talent Programs “Stability of Linear Engineering Foundations in Warm Permafrost Regions under a Changing Climate” and “Deformation and Stability of Roadbed in Permafrost Regions”, CAS West Light Foundation for PhD G.Y. Li, Funds of the State Key Laboratory of Frozen Soils Engineering, CAS (Grant Nos SKLFSE-ZQ-02 and SKLFSE-ZY-03). |
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| 摘 要： | Abstract: Permafrost (perennially frozen ground) appears widely in the Golmud-Lhasa section of the Qinghai-Tibet railway and is characterized by high ground temperature (≥ ?1°C) and massive ground ice. Under the scenarios of global warming and human activity, the permafrost under the railway will gradually thaw and the massive ground ice will slowly melt, resulting in some thaw settlement hazards, which mainly include longitudinal and lateral cracks, and slope failure. The crushed rock layer has a thermal semiconductor effect under the periodic fluctuation of natural air. It can be used to lower the temperature of the underlying permafrost along the Qinghai-Tibet railway, and mitigate the thaw settlement hazards of the subgrade. In the present paper, the daily and annual changes in the thermal characteristics of the embankment with crushed rock side slope (ECRSS) were quantitatively simulated using the numerical method to study the cooling effect of the crushed rock layer and its mitigative ability. The results showed that the ECRSS absorbed some heat in the daytime in summer, but part of it was released at night, which accounted for approximately 20% of that absorbed. Within a year, it removed more heat from the railway subgrade in winter than that absorbed in summer. It can store approximately 20% of the “cold” energy in subgrade. Therefore, ECRSS is a better measure to mitigate thaw settlement hazards to the railway.
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| 关 键 词： | Key words: Qinghai-Tibet railway climate change embankment with crushed rock side slope numerical analysis thaw settlement |
| 收稿时间： | 2009/9/23 0:00:00 |
| 修稿时间： | 2009/10/9 0:00:00 |
Thermal Characteristics of the Embankment with Crushed Rock Side Slope to Mitigate Thaw Settlement Hazards of the Qinghai-Tibet Railway |
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| Authors: | LI Guoyu MU Yanhu ZHANG Xia State Key Laboratory of Frozen Soil Engineering CAREERI Chinese Academy of Science Lanzhou China School of Energy Power Engineering Lanzhou University of Technology Lanzhou China |
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| Institution: | [1]State Key Laboratory of Frozen Soil Engineering, CAREERL Chinese Academy of Science, Lanzhou 730000, China [2]School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | Permafrost (perennially frozen ground) appears widely in the Golmud‐Lhasa section of the Qinghai‐Tibet railway and is characterized by high ground temperature (≥–1°C) and massive ground ice. Under the scenarios of global warming and human activity, the permafrost under the railway will gradually thaw and the massive ground ice will slowly melt, resulting in some thaw settlement hazards, which mainly include longitudinal and lateral cracks, and slope failure. The crushed rock layer has a thermal semiconductor effect under the periodic fluctuation of natural air. It can be used to lower the temperature of the underlying permafrost along the Qinghai‐Tibet railway, and mitigate the thaw settlement hazards of the subgrade. In the present paper, the daily and annual changes in the thermal characteristics of the embankment with crushed rock side slope (ECRSS) were quantitatively simulated using the numerical method to study the cooling effect of the crushed rock layer and its mitigative ability. The results showed that the ECRSS absorbed some heat in the daytime in summer, but part of it was released at night, which accounted for approximately 20% of that absorbed. Within a year, it removed more heat from the railway subgrade in winter than that absorbed in summer. It can store approximately 20% of the “cold” energy in subgrade. Therefore, ECRSS is a better measure to mitigate thaw settlement hazards to the railway. |
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| Keywords: | Qinghai-Tibet railway climate change embankment with crushed rock side slope numerical analysis thaw settlement |
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