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根据带相变热传导有限元方法,对普通路基、含保温板路基、热棒路基和保温板热棒复合结构路基在未来50年青藏铁路沿线气温上升2．0℃情况下的温度场进行了预报分析和比较．计算结果表明,在年平均气温为-3．5℃或地表年平均温度为-1℃的地区,在青藏铁路50年的使用期内,普通路基、含保温板路基和热棒路基在气温升高条件下路基下伏、冻土都将发生融化,路基将会产生较大融沉变形,不能保证青藏铁路路基的稳定性．而保温板热棒复式结构充分利用了保温板和热棒两种措施的优点,可以更好的提高保护冻土的效率．
According to the finite element method with phase change heat conduction, the temperature field of ordinary embankment, embankment with thermal insulation board, hot rod embankment and thermal rod composite structure is predicted to increase by 2.0 ℃ along the Qinghai-Tibet Railway in the next 50 years Analysis and comparison. The results show that in the region with annual average temperature of -3.5 ℃ or annual surface temperature of -1 ℃, during the 50 years of Qinghai-Tibet Railway’s operation, the common embankment, Under high conditions, the subgrade will melt and the permafrost will melt. The embankment will have greater thawing deformation and can not guarantee the stability of subgrade of Qinghai-Tibet Railway. The thermal insulation board hot rod duplex structure takes full advantage of the advantages of insulation board and hot rod two measures, you can better improve the efficiency of the protection of frozen soil.