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| Analysis of Geothermal Field of Thermal Rod Subgrade of Qinghai－Tibet Railway in Permafrost Region |
| NIU Dong － xing，LI Yong，XIONG Zhi － wen，HAN Long － wu |
| Northwest Research Institute Co． Ltd of China Railway Engineering Corporation，Lanzhou，Gansu 730000，China |
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Abstract Research purposes:To master the engineering features of the thermal rod subgrade and the cooling effect of the thermal rod timely for evaluating the engineering stability of the thermal rod subgrade of the Qinghai － Tibet railway in permafrost region，this paper makes the comparatively analysis of the geothermal field of natural hole，the left shoulder hole and right shoulder hole made between 2006 and 2009 of one thermal rod subgrade of the Qinghai － Tibet Railway and researches the cooling effect of the thermal rod subgrade．
Research conclusions:From the analysis it can be seen that the ground temperature in depth between 0 and 1.5meters varies greatly under the influence of the air temperature． The ground temperature of the shoulder hole between 1.5 and 10.0 meters decreases year by year because of the cooling effect of the thermal rod，.and in the first 2 to 3 years after the Qinghai－Tibet Railway being open to traffic，the ground temperature falls obviously．So the thermal rod can make the ground temperature down quickly to protect the permafrost．
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Received: 24 May 2012
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Wu Qingbai，Liang Suyun，Gao Xingwang． Research of Convection Heat Tranfer Between Thermalpile and Air ［J］． Journal of Glaciology and Geocryology，1996(1) : 37－41．
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Niu Dongxing，Li Yong，Han Longwu． The Analysis of Engineering Effect of Heat Safeguard in Permafrost Regions along Qinghai － Tibet Railway ［J］． Journal of Railway Engineering Society，2012( 3) : 26－29．
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2012, Vol. 29 
