Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment
文献类型：期刊论文
| 作者 | Liu Ming-hao1,2; Li Guo-yu1; Niu Fu-jun1; Lin Zhan-ju1; Shang Yun-hu1,2 |
| 刊名 | JOURNAL OF CENTRAL SOUTH UNIVERSITY
 |
| 出版日期 | 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 |
| WOS记录号 | WOS:000400863800025 |
| 出版者 | JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY |
| URI标识 | http://www.irgrid.ac.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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来源：寒区旱区环境与工程研究所
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