气候变化领域集成服务门户(CCPortal): Wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments in high-altitude permafrost zones

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DOI	10.1016/j.trgeo.2020.100447
	Wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments in high-altitude permafrost zones
	Li, Xiaolin; Ma, Wei; Mu, Yanhu; Dong, Jianhua; Chen, Ling
通讯作者	Ma, W (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	2214-3912
卷号	27
英文摘要	The crushed rock layers (CRLs) with a satisfactory cooling effect has been widely used to mitigate permafrost thaw beneath road embankments in cold regions. However, whether the CRLs can still work as well for an expressway constructed with an integral embankment is still under discussion, it is generally accepted that the expressway with wide asphalt pavement should be constructed with two separated embankments rather than one integral embankment in permafrost zones. In that case, wind field around the two embankments would be of great importance as it would impact the work conditions of the CRLs considerably. Here, a coupled computational fluid dynamics and heat transfer model was developed to numerically investigate and quantify the characteristics of wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments (SCREs) with different separating strip widths (SSWs). The model was validated by the field observed data of wind flows and ground temperatures around an experimental expressway. The simulated results indicated that the two SCREs can ensure the long-term thermal stability of permafrost subgrade in the projected climate warming scenario. However, due to different distribution of wind field around the two SCREs, permafrost thermal regimes beneath them differed considerably under different SSWs. The SSW exerted a significant impact on the cooling effect of the rear embankment, while less significant to that of the front embankment. To ensure that the two SCREs have close thermal performances, the SSW between them should be not less than 15 times of the embankment height. In addition, the local warming effect, which is caused by low wind speed, can result in severe permafrost degradation when the separating strips were narrow.
关键词	ICE-RICH PERMAFROST COOLING PERFORMANCE HEAT-TRANSFER COLD REGIONS CONVECTION RAILWAY LAYER WARM ENHANCEMENT INTERLAYER
英文关键词	Crushed rock layer; Expressway constructed with separated embankments; Wind field; Thermal performances; Permafrost zones
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Civil ; Engineering, Geological
WOS记录号	WOS:000621106700002
来源期刊	TRANSPORTATION GEOTECHNICS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253970
作者单位	[Li, Xiaolin; Ma, Wei; Mu, Yanhu; Chen, Ling] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Li, Xiaolin; Ma, Wei; Chen, Ling] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Dong, Jianhua] Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaolin,Ma, Wei,Mu, Yanhu,et al. Wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments in high-altitude permafrost zones[J]. 中国科学院西北生态环境资源研究院,2021,27.
APA	Li, Xiaolin,Ma, Wei,Mu, Yanhu,Dong, Jianhua,&Chen, Ling.(2021).Wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments in high-altitude permafrost zones.TRANSPORTATION GEOTECHNICS,27.
MLA	Li, Xiaolin,et al."Wind field and thermal performances of an expressway constructed with two separated crushed-rock embankments in high-altitude permafrost zones".TRANSPORTATION GEOTECHNICS 27(2021).