多年冻土区聚苯乙烯隔热公路路基温度场数值分析

为了研究随外界环境条件改变聚苯乙烯(EPS)冻土路基温度场变化特征,运用ABAQUS有限元分析方法,对多年冻土区EPS隔热路基的温度场进行了数值模拟.计算时采用改变EPS铺设位置,模拟路面下多年冻土季节最大融深在路基修筑完工后8a内随时间的变化.通过对计算结果分析得出,在多年冻土区路基中铺设保温材料对路面下多年冻土具有明显的保护作用.当EPS铺设在路堤底部时,路堤温度场分布比较均匀,路堤内部都为正温,在EPS板下,路基温度都为负温,说明EPS有效阻止了边坡和路面传入的热量.因此,如果要修筑EPS隔热路基,应将EPS板铺设于路堤底部.

Numerical simulation of thermal state of EPS insulation roadbed in permafrost region

In order to research the changes of subgrade temperature field with alterable environmental conditions, the method of 2 - D finite element analysis was conducted by ABAQUS software to simulate thermal state of the roadbed with insulations in permafrost region. The maximum thaw depths during the following 8 years in permafrost under the roadbed were simulated by varying the position of EPS. By analyzing the calculated results, it is shown that the roadbed with EPS can effectively protect permafrost under roadbed. As EPS placed at the bottom of subgrade, the distribution of temperature field is symmetrical and temperature in subgrade is plus, in subgrade under EPS the temperature is negative, which shows that EPS effectively prevents heat exchange from subgrade slope and pavement surface, so EPS should be placed at the bottom of subgrade in construction.