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Numerical analysis on the thermal regimes of thermosyphon embankment in snowy permafrost area
Received:May 07, 2017    Click here to download the full text
Citation of this paper:Yan Lu,Xin Yi,WenBing Yu,WeiBo Liu,2017.Numerical analysis on the thermal regimes of thermosyphon embankment in snowy permafrost area.Sciences in Cold and Arid Regions,9(6):580~586.
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Author NameAffiliationE-mail
Yan Lu State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China  
Xin Yi College of Civil Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China  
WenBing Yu State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 99155644@qq.com 
WeiBo Liu State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
 
Abstract:Snow covers the road embankments in winter in high latitude permafrost zones. The effect of snow cover on embankments was simulated based on field measurements of boundary conditions and initial ground temperature profile in Mohe, China. The effect of thermosyphons on the embankment warmed by snow cover was evaluated by numerical simulations as well. The results indicate that the difference of thermal regimes between non-thermosyphon and thermosyphon embankments reaches to 22 m in depth below the ground surface. It is much warmer in the non-thermosyphon embankment body in winter. Affected by the snow cover, heat flux gradually spreads into the deep ground of the subgrade over time. The permafrost table under the slope toe of a thermosyphon embankment is 1.2 m higher than that of a non-thermosyphon embankment in the 20th year. In addition, the permafrost table at the slope toe of a thermosyphon embankment is 26 cm deeper over 20 years. These results indicate that thermosyphons can greatly weaken the warm effect of snow cover. However, thermosyphons cannot avoid the degradation of permafrost under the scenarios of snow cover. Therefore, composite measures need to be adopted to keep embankment stability in snowy permafrost zones.
keywords:snow cover  permafrost embankment  thaw settlement  thermosyphon
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