Numerical analysis on the thermal regimes of thermosyphon embankment in snowy permafrost area  

作　　者：Yan Lu Xin Yi WenBing Yu WeiBo Liu 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China [2]College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China [3]College of Civil Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Research in Cold and Arid Regions》2017年第6期668-674,共7页寒旱区科学（英文版）

基　　金：supported by the National Natural Science Fund(41571070);the Fund of SKLFS(SKLFSE-ZT-21);the Fund of the National Key Basic Research and Development Program(2012CB026102);the Funds of Key Research Program of Frontier Sciences of CAS(QYZDYSSWDQC015);fund HHS-TSS-STS-1502

摘　　要：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 20 th 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.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 20 th 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.

关 键 词：SNOW cover PERMAFROST EMBANKMENT thaw SETTLEMENT THERMOSYPHON 

分 类 号：U416.168[交通运输工程—道路与铁道工程]