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块石护坡调温路基是多年冻土区铁路设计中所采取的一种积极保护冻土的措施,该调温过程包括暖季的热屏蔽作用和冷季的对流降温两个方面。根据现场观测资料,对两种不同粒径的块石层下地温热状况给予了初步分析。结果表明,暖季小块石层(粒径为50～80mm)的热屏蔽作用要优于大块石层(粒径为400～500mm),而冷季大块石层的对流降温作用要强于小块石层;综合一个暖冷季循环周期来看,大块石层的调温效果要好于小块石层。块石护坡路基下0℃等温线大部分已基本接近原天然地表。初步认为,此种发展趋势有利于路基的稳定。
Block rock slope conditioning temperature control subgrade is a measure adopted by the railway design in permafrost region to actively protect the permafrost. The temperature adjustment process includes the heat shielding effect in warm season and convection cooling in cold season. According to the field observation data, the ground temperature thermal conditions under two different grain sizes are given preliminary analysis. The results show that the thermal shielding effect of the small stone (50 ~ 80mm) in the warm season is better than that of the large stone (the grain size is 400 ~ 500mm), while the convective cooling effect of the large stone in the cold season is stronger than Small stone; comprehensive cycle of a warm and cold season, large stone effect of temperature control is better than small stone. Most of the 0 ℃ isotherms under the block slope embankment have been basically close to the original natural surface. It is initially believed that such a trend of development is conducive to the stability of roadbed.