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Temperature field response of Qinghai-Tibetan Railway roadbed upon horizontalgathering and controlling nature cold energy

BIE Xiao-yong~(1,2), ZHOU Guo-qing~(1,2), ZHAO Guang-si~1, LIU Zhi-qiang~(1,2)(1.College of Architecture and Civil Engineering,CUMT,Xuzhou 221008,China;00,China)  
Qinghai-Tibetan Railway roadbed being building will go through large area of the high-temperature and ice-rich permafrost, so the problem of roadbed stability will be an austerity challenge. A new method that gathers and controls nature cold energy to keep the permafrost roadbed stability with horizontal pipes is put forward in the paper. The method gathers the cold energy caused by the temperature difference between air and ground in winter and releases it in summer. Comparison of the temperature fields laws between the roadbed using this method and the typical roadbed has been carried out. It is shown that the roadbed temperature fields is a compounded fields affected by the air temperature, ground temperature, short-term construction disturbance and the working pipes. The roadbed will be in the status of thermal instability without any measurements being taken. The pipes can decrease the temperature of the roadbed and introduce cold energy into roadbed to exert the function of "cold energy-storing in cold seasons and cold energy-releasing in the warm seasons". So the roadbed will become into subzero status rapidly and protect permafrost roadbed effectively.
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