多年冻土区道碴结构铁路路基室内试验研究

介绍了青藏高原多年冻土区道碴结构铁路路基的室内模型试验研究结果。分析了模型路基典型部位的温度随时间的变化情况及整个路基中典型断面在最低负温、最高正温和融化期结束时的温度场特征。通过对不同周期内对应时刻温度场的对比分析表明 :在路基表面 ,温度分布不对称 ;随着时间的推移 ,路基土体的温度有明显的降低 ,最大融化深度在逐渐减小 ,这说明在环境温度较低、路基高度较高的情况下 ,道碴路基结构是一种能维持路基下冻土稳定的路基结构形式 ,但在考虑全球升温及高温冻土条件下 ,还需要采取其它保护冻土措施

LABORATORY EXPERIMENT STUDY ON BALLAST STRUCTURE RAILWAY EMBANKMENT IN PERMAFROST REGIONS

This paper introduces the laboratory experimental results of the ballast structure railway embankment in permafrost regions. The variational characteristics of the temperature at several typical sections of the model embankment are analyzed. In addition, the temperature fields of the typical section of the model embankment, at three times of each test period, are analyzed too. The selected times are the lowest negative temperature,the highest positive temperature and the end of the thaw period.Results show that the temperature fields are asymmetry at the surface of the embankment,and that the temperature of the embankment soil mass goes down and the biggest thawing depth reduces gradually as time goes by, which proves that the ballast embankment structure can maintain the stability of the embankment under the condition of lower air temperature and higher embankment height. But if taking account of the rising of air temperature of the globe and the higher temperature permafrost,the additional engineering measures for permafrost protection are needed.