冻土路基块(碎)石层反射率测量及应用

doi:10.13722/j.cnki.jrme.2015.1654

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Abstract A novel method for measuring the albedo of crushed-rock layer was proposed in this paper. The albedo of the crushed limestone layers with single-size aggregates of 1，2，3 and 5 cm sizes was measured respectively to reveal the main factors controlling the albedo of the crushed-rock layer. The layer was painted with the high-reflective pigment to increase the albedo of the crushed-rock layer and then the albedo of the painted layer was measured. The albedo of the crushed-rock layer was tested and compared against the albedo measured by the ASTM E1918A. It was found that when the variation of the incident solar intensity was less than 20W/m2 (tolerant errors stated by ASTM E1918A)，the ASTM E1918A either underestimate or overestimate the albedo of the crushed-rock layer up to 0.00–0.03. The reflectivity of the crushed-rock layer decreases with the aggregate size，and the albedo of the crushed-rock layer is 0.10–0.25 lower than that of the fresh flat crushed-rock. This difference is because photons leaving the crushed-rock layer have a probability to return to the layer，reducing the albedo of the crushed-rock layer. Painting the crushed-rock layer with high reflective pigment raised the albedo of the layer from 0.262 to 0.433. Raising the reflectivity of the crushed-rock layer on slope of embankment reduces the temperature of side slope and protects the permafrost stratum.

Key words： soil mechanics permafrost crushed-rock layer albedo ASTM E1918A multiple reflections crushed-rock revetment

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	Articles by authors
	TAN Kanghao1
	2
	QIN Yinghong1
	2
	LIANG Jia1
	2
	PANG Ruyue1
	LI Yunfeng1

Cite this article:

TAN Kanghao1,2,QIN Yinghong1, et al. Theory and application of measuring the albedo of crushed-rock layer embankment in permafrost regions[J]. , 2017, 36(1): 254-260.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1654 OR http://www.rockmech.org/EN/Y2017/V36/I1/254

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