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《Journal of Glaciology and Geocryology》 2005-05
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Evaluation of Application of the Insulation to Embankment in Qinghai-Tibetan Railway

WEN Zhi,\ SHENG Yu,\ MA Wei,\ WU Ji-chun (1.State Key Laboratory of Frozen Soil Engineering,CAREERI,CAS,Lanzhou Gansu 730000,China)  
In many cases,protecting permafrost from further thaw due to human activities might be the first choice for embankment design in permafrost regions.2-D finite element analysis of temperature field with phase change is conducted to simulate the thermal state of the Qinghai-Tibetan railway with extruded polystyrenes (EPS).Based on the predicted maximum thawing depth for the following 50-year,the rational position,width and thickness of the insulation,whose construction season,and the applicable range of the insulation in embankment engineering of the Qinghai-Tibetan railway in terms of mean annual air temperature(MAAT) were discussed.\ \ Numerical results show that 10 cm EPS is an appropriate choice considering economy and intensity.Moreover,the deeper the insulation is placed,the better the thermal-insulation efficiency is.Constructed season affects the maximum thawing depth of embankment.Considering the difficulty in cold climate,embankment with insulation may be constructed before thawing or after freezing.The wider the insulation is,the better the thermal-insulation effect is.As for permafrost regions along the Qinghai-Tibetan railway where MAAT is from-4.00 ℃ to-5.20 ℃,the insulation can guarantee the thermal stability of Qinghai-Tibetan railway.Geothermal field of permafrost has influence on applicable range of the insulation and the influence of MAGT varies with the height of embankment.
【Fund】: 中国科学院知识创新工程重大项目(KZCX1-SW-04);; 国家重点基础研究发展规划项目(2002CB412704);; 国家自然科学基金重大项目(90102006)资助
【CateGory Index】: U213.14;
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