青藏铁路北麓河试验段路基保温材料处理措施初步分析

PRELIMINARY ANALYSIS ON INSULATION TREATMENT OF EMBANKMENT AT BEILUHE TEST SECTION OF QINGHAI-TIBET RAILWAY

阐述了青藏铁路北麓河试验段路基保温材料试验段路基结构、试验监测方案。通过试验路基建成一年以来的观测数据对路基下伏多年冻土的变化动态、通过保温板的热收支、保温板上下面的积温等进行了初步分析。分析结果表明:路基保温材料处理措施在一定程度上具有保护多年冻土的作用,对于高路基原天然地表下活动层内会形成持久的零温带;进入保温板的热量在路基阴阳面呈现不对称,阳面吸热明显大于阴面。

The structure of test embankment and monitoring system of the insulation embankment test section in Beiluhe site of Qinghai-Tibet Railway are described. Based on the observed data of the first round year from building of the embankment,the dynamic process of the underlying permafrost,heat budget passing of insulation layer and temperature accumulation at both surfaces of insulation layer are preliminarily analyzed. Results indicate that the insulation embankment,to some extent,is of the function of protecting permafrost. A durative zero temperature zone may exist between the original ground surface and permafrost table. The heat entering insulation layer presents a serious asymmetry. The sunshiny side of the embankment absorbs much more heat than that of the shade side.