气候变化领域集成服务门户(CCPortal): Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions

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DOI	10.1016/j.energy.2015.08.059
	Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions
	Zhang, Mingyi; Zhang, Xiyin; Li, Shuangyang; Wu, Daoyong; Pei, Wansheng; Lai, Yuanming
发表日期	2015
ISSN	0360-5442
EISSN	1873-6785
起始页码	874
结束页码	881
卷号	93
英文摘要	The crushed-rock interlayer embankment with ventilation ducts has been advocated to stabilize the permafrost stratum under expressways in permafrost regions. This embankment must render better cooling effect than railway embankments because the expressway surface is wider and hotter. To this purpose, the walls of the ventilation ducts need to be perforated. This study evaluates the cooling performance of the rushed-rock interlayer embankments with unperforated and perforated ventilation ducts along an expressway in permafrost regions of the Qinghai-Tibet Plateau. A three-dimensional numerical model is developed based on heat and mass transfer theories. The model includes the coupled heat transfer between air and ventilation duct wall, the air convective heat transfer in crushed-rock layer, and the heat conduction with phase change in soil layers. The numerical results indicate that if the ventilation ducts are perforated and embedded at the top of the crushed-rock interlayer, the cooling effect of the embankment can be greatly enhanced. A good cooling performance can still be achieved even if the centerline spacing of the perforated ventilation ducts is enlarged to 4 m to facilitate the construction. The crushed-rock interlayer embankment with perforated ventilation ducts is a better candidate structure for expressways in permafrost regions of the Qinghai-Tibet Plateau. (C) 2015 Elsevier Ltd. All rights reserved.
英文关键词	Cooling performance; Crushed-rock interlayer embankment; Perforated ventilation duct; Expressway; Permafrost region
语种	英语
WOS研究方向	Thermodynamics ; Energy & Fuels
WOS类目	Thermodynamics ; Energy & Fuels
WOS关键词	QINGHAI-TIBET RAILWAY ; LAYER
WOS记录号	WOS:000367630200079
来源期刊	ENERGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239492
作者单位	[Zhang, Mingyi; Zhang, Xiyin; Li, Shuangyang; Wu, Daoyong; Pei, Wansheng; Lai, Yuanming] 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	Zhang, Mingyi,Zhang, Xiyin,Li, Shuangyang,et al. Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions[J],2015,93.
APA	Zhang, Mingyi,Zhang, Xiyin,Li, Shuangyang,Wu, Daoyong,Pei, Wansheng,&Lai, Yuanming.(2015).Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions.ENERGY,93.
MLA	Zhang, Mingyi,et al."Evaluating the cooling performance of crushed-rock interlayer embankments with unperforated and perforated ventilation ducts in permafrost regions".ENERGY 93(2015).