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在多年冻土区修建铁路路堤,打破了原来天然地表与外界的热力平衡,引起地下温度场重新分布。通过对青藏铁路清水河试验段3年温度和变形数据的分析,研究路堤内阴阳坡温度场差异及其对冻土路堤变形以及稳定性的影响。研究结果表明:路堤阴阳坡的温度场在空间上不对称,时间上不同步,在8—9月阳坡冻融线下降速度明显大于阴坡,在10月下旬阴坡表层和深层的回冻速度远远大于阳坡的回冻速度;阴阳坡两侧路肩表层的融沉速率明显不同,阳坡路肩表层的沉降量明显大于阴坡路肩,并且随着时间的延续,阴阳坡路肩深层的融沉也有不对称发展的趋势;经过3个冻融循环后,路堤阴阳坡温度场、变形场仍不稳定,不对称仍在发展。
The construction of railway embankments in permafrost regions has broken the thermal equilibrium between the natural surface and the outside world and caused the redistribution of the temperature field in the underground. Based on the analysis of the temperature and deformation data of the Qingshuihe experimental section of the Qinghai-Tibet Railway in the past three years, the difference of the temperature field between the Yin and Yang slope in the embankment and its influence on the deformation and stability of the embankment in frozen soil are studied. The results show that the temperature field of Yin-Yang slope in the embankment is spatially asymmetric and not synchronized in time. The freezing-thawing of the sunny slope in August-September is obviously slower than that of the shady slope. In late October, The rate of thaw settlement is far greater than that of the sunny slope. The thawing and sinking rates of the shoulders on both sides of the yin-yang slope are obviously different, and the settlement of the surface on the sunny slope is obviously larger than that of the shady slopes. With the extension of time, Shen also has the tendency of asymmetric development. After three freeze-thaw cycles, the temperature field and the deformation field of the Yin-Yang slope are still unstable and the asymmetry is still developing.