气候变化领域集成服务门户(CCPortal): Numerical study on temperature characteristics of expressway embankment with crushed-rock revetment and ventilated ducts in warm permafrost regions

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DOI	10.1016/j.coldregions.2009.06.001
	Numerical study on temperature characteristics of expressway embankment with crushed-rock revetment and ventilated ducts in warm permafrost regions
	Zhang, Mingyi; Lai, Yuanming; Dong, Yuanhong
发表日期	2009
ISSN	0165-232X
起始页码	19
结束页码	24
卷号	59 期号:1
英文摘要	The crushed-rock revetment embankment and duct-ventilated embankment, as effective cooling measures, have been used to protect the underlying permafrost from thawing in Qinghai-Tibet Railway construction of China. However, the two cooling measures cannot be directly applied to the expressways with a wide and high-temperature pavement surface in warm permafrost regions. Therefore, considering the heat transfer characteristics of crushed-rock revetment embankment and duct-ventilated embankment, we designed a new-type embankment with crushed-rock revetment and ventilated ducts. For cold regions engineering, the temperature is the most important factor that determines the stability of construction. To research the thermal stability of the new-type embankments according to the related theories of heat and mass transfer. a three-dimensional theoretical and numerical model for the embankment, which is composed of the coupled heat transfer problem between airflow and duct wall the air, convective heat transfer problem within crushed-rock layer, and the heat conduction problem with phase change in soil layers, was presented to analyze the temperature characteristics of the new-type embankment. Three points can be concluded from the numerical results based on the assumption that the air temperature will be warmed up by 2.6 degrees C in the next 50 years. First, the crushed-rock revetment embankment would be unstable because the crushed-rock revetment can reduce only the ground temperature at the side-slope foots of embankment, but the permafrost table descends severely in the middle. Second, the ventilated-duct embankment can effectively cool the soil at the middle of the embankment but not at the side-slope foots, so that the uneven temperature distributions would be deleterious to the stability of expressway. Third, the new-type embankment structure is effective to decrease the underlying ground temperature and to ensure the stability of expressway with a wide (multi-lane) and high-temperature upper surface in warm permafrost regions. (C) 2009 Elsevier B.V. All rights reserved.
英文关键词	Numerical study; Temperature characteristic; Expressway embankment; Crushed-rock revetment; Ventilated duct; Warm permafrost region
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS关键词	TIBET RAILWAY
WOS记录号	WOS:000271369200004
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/239529
作者单位	[Zhang, Mingyi; Lai, Yuanming; Dong, Yuanhong] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingyi,Lai, Yuanming,Dong, Yuanhong. Numerical study on temperature characteristics of expressway embankment with crushed-rock revetment and ventilated ducts in warm permafrost regions[J],2009,59(1).
APA	Zhang, Mingyi,Lai, Yuanming,&Dong, Yuanhong.(2009).Numerical study on temperature characteristics of expressway embankment with crushed-rock revetment and ventilated ducts in warm permafrost regions.COLD REGIONS SCIENCE AND TECHNOLOGY,59(1).
MLA	Zhang, Mingyi,et al."Numerical study on temperature characteristics of expressway embankment with crushed-rock revetment and ventilated ducts in warm permafrost regions".COLD REGIONS SCIENCE AND TECHNOLOGY 59.1(2009).