Abstract
Based on the background of the subgrade in Dalian of Dalian-Haerbin Passenger Dedicated line and combined the local climate condition and geological data, the thermal field in subgrade was simulated by finite element software, and the distribution of thermal field in subgrade of different month in winter and different years were analyzed. The results indicated that: The main areas of subgrade appeared negative temperature in winter, and the sunward and shady aspect should be considered in the distribution of thermal field in actual analysis. The negative temperature of thermal field in subgrade decreased with the increasing of the years in the same period, and the global warming have a significant effect on the distribution of thermal field.
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