气候变化领域集成服务门户(CCPortal): Using perforated ventilation ducts to enhance the cooling effect of crushed-rock interlayer on embankments in permafrost regions

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DOI	10.1016/j.coldregions.2010.03.003
	Using perforated ventilation ducts to enhance the cooling effect of crushed-rock interlayer on embankments in permafrost regions
	Dong, Yuanhong; Lai, Yuanming; Xu, Xiangtian; Zhang, Shimin
发表日期	2010
ISSN	0165-232X
EISSN	1872-7441
起始页码	76
结束页码	82
卷号	62 期号:1
英文摘要	A previous laboratory test carried out by the authors proved that the addition of ventilation ducts can efficiently enhance the cooling effect of crushed-rock interlayer. The mechanism revealed by the laboratory test was that, the ventilation ducts intensified natural convection and thus enhanced cooling effect of the crushed-rock interlayer by decreasing its upper boundary temperature. In this study, to further enhance the cooling effect of the crushed-rock interlayer, the ventilation ducts were perforated and then positioned at the upper boundary of the crushed-rock interlayer. Two crushed-rock interlayer embankments with perforated and imperforated (ordinary) ventilation ducts were tested under the same test conditions. The analysis of the temperature characteristics of the two test crushed-rock interlayer embankments with perforated and imperforated ventilation ducts showed that the crushed-rock interlayer embankment performed a more efficient cooling effect when the ventilation ducts were perforated. The effect was straightforward: the addition of the perforation on the ventilation duct wall let the air that was flowing through ventilation ducts partially penetrated into the crushed-rock interlayer. The result was that, during negative air temperature period, the upper boundary temperature of crushed-rock interlayer was decreased to a great extent, and consequently natural convection in the crushed-rock interlayer was intensified. The cooling effect during negative air temperature was efficient enough to restrict the heat injected into the embankment during positive air temperature period. On the whole, the crushed-rock interlayer embankment with perforated ventilation ducts has a good cooling effect to the underlying permafrost. Based on these, the new type of embankment is recommended in the construction of large-width highways in permafrost regions in the future. (C) 2010 Elsevier B.V. All rights reserved.
英文关键词	Crushed-rock interlayer embankment; Perforated ventilation duct; Cooling effect; High-grade highway
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS关键词	RAILWAY
WOS记录号	WOS:000278160300009
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239524
作者单位	[Dong, Yuanhong; Lai, Yuanming; Xu, Xiangtian; Zhang, Shimin] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Dong, Yuanhong,Lai, Yuanming,Xu, Xiangtian,et al. Using perforated ventilation ducts to enhance the cooling effect of crushed-rock interlayer on embankments in permafrost regions[J],2010,62(1).
APA	Dong, Yuanhong,Lai, Yuanming,Xu, Xiangtian,&Zhang, Shimin.(2010).Using perforated ventilation ducts to enhance the cooling effect of crushed-rock interlayer on embankments in permafrost regions.COLD REGIONS SCIENCE AND TECHNOLOGY,62(1).
MLA	Dong, Yuanhong,et al."Using perforated ventilation ducts to enhance the cooling effect of crushed-rock interlayer on embankments in permafrost regions".COLD REGIONS SCIENCE AND TECHNOLOGY 62.1(2010).