青藏铁路楚玛尔河地区复合路基地温状况分析

青藏铁路楚玛尔河地区广泛应用了片石气冷及碎石护坡复合路基结构,根据该地区复合路基与一般路基实测地温资料,对比分析了复合路基与一般路基的地温状况,研究2种路基结构保护多年冻土的效果。结果表明:(1)一般路基地温场整体向不利于冻土路基稳定的趋势发展,难以起到全面保护多年冻土的作用;(2)复合路基在降低地温和维护地温场对称性方面都具有显著效果,能主动冷却冻土路基,很好地保护多年冻土。

Analysis on Ground Temperature of Composite Subgrade along Qinghai-Tibet Railway in Chumar River Region

The composite subgrade made up of air-cooled rubbles and crushed-stone revetment is widely being used in the region of Chumar River along Qinghai-Tibet Railway.In this paper,based on the ground temperature data measured in this region for both the composite subgrade and the ordinary subgrade,the situations of ground temperatures were compared and analyzed between the two kinds of subrades,and the protective effects on the permafrost soil by the two kinds of subgrade structures were respectively researched.The results are as follows:the ground temperature field of the ordinary subgrade usually presents a tendency which is not conducive to the stability of frozen-soil subgrade,so the ordinary subgrade cannot play the role of comprehensively protecting the permafrost soil.In contrast,the composite subgrade can exert remarkable effects on lowering the ground temperature and maintaining the symmetry of ground temperature field,can automatically cool the frozen-soil subgrade,and so can provide a good protection for permafrost soil.