【摘要】 用数值模拟的方法计算了同一工程环境下块石路堤不同块石厚度情况的路基温度场随时间的变化。对比分析显示:块石路堤均具有主动冷却路基的作用;由于边坡效应的存在,对一定的工程环境和设计,块石路堤存在最优块石厚度,使冻土路基的冻结强度和多年冻土上限抬升达到最佳。块石太薄,块石中空气的循环达不到最大制冷能力;块石太厚,边坡效应将导致空气的对流存在多向流动环,反而使隔热和制冷能力均减弱。更多还原

【Abstract】 By numerical stimulation the temperature distribution were obtained in block-stone embankment with block-stone in different thicknesses.The comparative analyses show that block-stone embankment has well active cooling effect on the railway foundation by raising the permafrost table and decreasing the permafrost temperature.For a certain construction environment and a certain construction design there is an optimal thickness of block stone which will freeze the foundation most strongly and raise the permafrost table maximally.The cause is the slope effect of embankment and the thickness of block-stone.When the block-stone is thin the air flow in embankment is weak and can not obtain great cooling ability;but when too thick the slope effect will cause multi-direction flow of air and weaken the cooling ability in winter and heat insulation effect in summer.更多还原