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	Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment
	Liu Ming-hao1,2; Li Guo-yu1; Niu Fu-jun1; Lin Zhan-ju1; Shang Yun-hu1,2
刊名	JOURNAL OF CENTRAL SOUTH UNIVERSITY
	2017-04-01
卷号	24期号:4页码:977-987
关键词	Qinghai-Tibet Railway crushed rock embankment porosity wind-blown sand permafrost degradation
ISSN号	2095-2899
DOI	10.1007/s11771-017-3500-2
通讯作者	Li Guo-yu(guoyuli@lzb.ac.cn)
英文摘要	It has been proven that crushed rock layers used in roadbed construction in permafrost regions have a cooling effect. The main reason is the existence of large porosity of the rock layers. However, due to the strong winds, cold and high radiation conditions on the Qinghai-Tibet Plateau (QTP), both wind-blown sand and/or weathered rock debris blockage might reduce the porosity of the rock layers, resulting in weakening the cooling effect of the crushed rock layer (CRL) in the crushed rock embankment (CRE) of the Qinghai-Tibet Railway (QTR) in the permafrost regions. Such a process might warm the underlying permafrost, and further lead to potential threat to the QTR's integrity and stability. The different porosities corresponding to the different equivalent rock diameters were measured in the laboratory using water saturation method, and an empirical exponential equation between porosity and equivalent rock diameter was proposed based on the measured experimental data and an important finding is observed in our and other experiments that the larger size crushed rock tends to lead to the larger porosity when arbitrarily packing. Numerical tests were carried out to study impacts of porosity on permafrost degradation and differential thaw depths between the sunny and shady shoulders. The results show that the decrease in porosity due to wind-blown sand or weathered rock debris clogging can worsen the permafrost degradation and lead to the asymmetric thermal regime. In the traditional embankment (without the CRL within it), the largest differential thaw depth can reach up to 3.1 m. The optimized porosity appears in a range from 34% to 42% corresponding to equivalent rock diameter from 10 to 20.5 cm. The CRE with the optimized porosities can make underlying permafrost stable and 0 A degrees C isotherms symmetric in the coming 50 years, even under the condition that the climate warming can lead to permafrost degradation under the CRE and the traditional embankment. Some practical implications were proposed to benefit the future design, construction and maintenance of CRE in permafrost regions.
收录类别	SCI
WOS关键词	PERMAFROST REGIONS ; PARTICLE-SIZE ; DEGRADATION ; REVETMENT ; MECHANISM ; HIGHWAY ; DESIGN
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY
WOS记录号	WOS:000400863800025
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557549
专题	寒区旱区环境与工程研究所
通讯作者	Li Guo-yu
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Sch Resources & Environm, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu Ming-hao,Li Guo-yu,Niu Fu-jun,et al. Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY,2017,24(4):977-987.
APA	Liu Ming-hao,Li Guo-yu,Niu Fu-jun,Lin Zhan-ju,&Shang Yun-hu.(2017).Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment.JOURNAL OF CENTRAL SOUTH UNIVERSITY,24(4),977-987.
MLA	Liu Ming-hao,et al."Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment".JOURNAL OF CENTRAL SOUTH UNIVERSITY 24.4(2017):977-987.

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