中文摘要：

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。

英文摘要：

One of the measures of actively and forwardly protecting frozen soil is adjusting the temperature of embankment by ripped-rock layer, used in the railway design in. permafrost regions. The effect of adjusting temperature consists of heat shield during summer-time and convective cooling during winter-time. In this study, a preliminary analysis was given to the thermal regime of ground temperature under the ripped-rock layer with both different grain diameters based on the in-situ measured data. The result showed that during summer-time, the ripped-rock layer with a grain diameter of 50--80 mm had better heat barrier than that one of 400--500 ram, but during winter-time, the latter had stronger convective cooling action. By a cyclic contrast, it was still found that the latter was excess to the former in the adjusting temperature. Moreover, the mostly part of 0~C isotherm has closed to the natural ground surface when the foundation soil under the revetment reaches the maximum of thawed depth; this will be benefit to the thermal stability of embankment.