Abstract
A series of experiments were done for the cooling effect of sloped crushed-rock revetments with different particle sizes under wind action in this study. The crushed-rock particle sizes include four kinds: 6–8, 14–16, 21–23 and 28–30 cm. The experimental result indicates that, under the windward and leeward conditions, the crushed-rock revetments with the four particle sizes all have good cooling effect and can effectively decrease the temperatures of the underlying soil layers; furthermore, the mean periodic temperatures of soil slope surfaces under crushed-rock revetments can be lowered to below 0 °C after two experimental cycles. At windward side, with the increase of particle size, the cooling effect of crushed-rock revetment becomes better when its particle size ranges between 6 and 30 cm; At leeward side, the cooling effect of crushed-rock revetment with a particle size range of 21–23 cm is best. Besides, we also find that under the experimental condition, the periodic range of temperature at the bottom of crushed-rock revetment is mainly dominated by windward/leeward condition, not crushed-rock particle size; namely, the periodic range of temperature at the bottom of windward crushed-rock revetment is far larger than that of the leeward one; and the maximum positive temperature at the bottom of windward crushed-rock revetment in every cycle is far higher than that at the bottom of leeward one; furthermore, the time of its positive temperature is longer, and it will be disadvantageous to the stability of permafrost embankment . At the same time, by analyzing the temperature distributions of the crushed-rock revetments, we find that the cooling mechanism of the leeward side is more complicated than that of the windward side.
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