Study on the Difference between the Southern and Northern Slopes of the Embankment in Permafrost Region on Qinghai-Tibet Plateau
Study on the Difference between the Southern and Northern Slopes of the Embankment in Permafrost Region on Qinghai-Tibet Plateau
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发表时间：
2006
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通讯作者：
Shen Yu-peng
中科院分区：
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作者：
Shen Yu-peng
多年冻土区铁路路基施工会严重扰乱地表与大气之间的传热传质平衡，引起路基温度场重新分布。通过对清水河部分试验段进行3年监测，分析变形和温度数据，研究青藏高原多年冻土区路基南北坡温度场差异及其对路基温度场的影响。 研究结果表明，南北坡温度场在空间上不对称，在时间上不同步，8、9月份路堤0℃线下降速度南坡快于北坡，10月份北坡表层和深层冻结过程均快于南坡。 相对两侧路肩的融沉降也不同，导致南侧路肩表层的融沉增加较多。随着时间的推移，相对两侧路肩的深层融沉也变得不对称，并有发展趋势。虽然已经经历了三个融冻周期，但温度场和变形场仍不稳定，有不对称趋势。
Railway embankment construction in permafrost will substantially disturb the heat and the mass transfer balance between the ground surface and the atmosphere and cause redistribution of temperature field underneath.Some test sections in Qingshuihe have been monitored for three years and the deformation and temperature data are analyzed to study the difference of the temperature field between the southern and the northern slopes of the embankment in permafrost region on Qinghai-Tibet Plateau and its effect on the deformation and the stability of permafrost embankment.Research findings show that the temperature field of the southern and northern embankment slope is asymmetrical in space and asynchronous in time.The 0 ℃ line drops down more rapidly in southern slope than in northern slope of the embankment during August and September.And it is more rapid in the freezing course of both surface and deep layer in northern slope than in southern slope in October.It is also different in thaw settlement of the two opposite embankment shoulders.It brings more thaw settlement in the surface layer of the southern embankment shoulder.As time goes on,it also becomes asymmetry in thaw settlement in deep layer of the two opposite embankment shoulders and this trend is developed.Although it has passed three thawing and freezing cycle,the temperature and deformation fields are not stable yet and the asymmetry trend is developed.