Field investigation on thermal characteristics of a slope-cooling structure for permafrost embankment in the Qinghai-Tibet Plateau
作者： Minghao Liu , Fujun Niu , Zhanju Lin , Jing Luo , Guoan Yin
DOI: 10.1016/J.COLDREGIONS.2020.103150
关键词:
摘要: Abstract A poor cooling effect on warm permafrost (> −1.0 °C) was observed in the crushed-rock revetment embankment (CRRE), which is widely used Qinghai-Tibet Railway. The filling of porous rock layers caused by wind-blown sand and rock-weathering Plateau can further weaken capacity CRRE may cause instability railway vehicles. This study describes a novel slope-cooling structure (NSCS), combines slope-warming prevention measure. full-scale built using new design region plateau. Ground temperatures air speeds pore space layer slopes were monitored. thermal characteristics NSCS evaluated along with its performance. results indicated that slope produced an effective process side-slopes subgrade permafrost. table elevated ground at shoulders showed decreasing trend after construction, particularly under shady side. Asymmetrical convection process, exhibits significantly higher speed frequency winters than those summers, to occur structure. decreases heat absorption during summers thus beneficial for heat-dissipating side-slopes. Moreover, reduce sunny-shady temperature difference, induced orientation; therefore, symmetry distribution maintained. In general, these contribute enhancement stability confirm application as method maintenance embankments formed
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