Numerical study of long-term cooling effects of thermosyphons around tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line
文献类型：期刊论文
| 作者 | Mu, Yanhu; Li, Guoyu; Yu, Qihao; Ma, Wei; Wang, Dayan; Wang, Fei |
| 刊名 | COLD REGIONS SCIENCE AND TECHNOLOGY
 |
| 出版日期 | 2016 |
| 卷号 | 121页码:237-249 |
| 关键词 | Tower footing Thermosyphons Foundation soils Permafrost Qinghai-Tibet Power Transmission Line |
| ISSN号 | 0165-232X |
| DOI | 10.1016/j.coldregions.2015.06.005 |
| 通讯作者 | Yu, Qihao(yuqh@lzb.ac.cn) |
| 英文摘要 | Two-phase closed thermosyphons are extensively used for cooling foundation soils of tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line (QTPTL). In this paper, the working period of these thermosyphons is firstly determined by field observations. Then, a 3-D numerical heat transfer model is constructed to study the long-term cooling effects of thermosyphons and thermal performance of foundation soils. The numerically simulated results show a significant cooling of foundation soils near thermosyphons in cold season approximately from late October to early May, and a rapid shift of the thermosyphon cooling to the footing side due to greater thermal conductivity of the concrete footing. As a consequence, a colder bulb would develop under the footing, increasing the bearing capacity of foundation soils. In warm season from the mid-May to mid-October, the maximum thaw around the footing would be greater than that in the natural ground due to better heat transfer through the concrete footing. During a 50-year operational period, foundation soils under the footing would roughly go through about four thermal stages under a combined effect of the thermosyphon cooling and climate warming: a rapid cooling stage in the first to 5th year, a stable stage in the 6th-15th year, a rapid warming stage in the 16th-35th year and a slow warming stage after the 35th year. During the operational period, the maximum thaw around the footing would be less than the embedding depth of the footing (5.8 m), meeting the design criterion for thermal stability of foundation soils. (C) 2015 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | 2-PHASE CLOSED THERMOSIPHON ; EMBANKMENT ; RAILWAY ; HIGHWAY |
| WOS研究方向 | Engineering ; Geology |
| WOS类目 | Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000367111400024 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2557164 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Yu, Qihao |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soils Engn, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mu, Yanhu,Li, Guoyu,Yu, Qihao,et al. Numerical study of long-term cooling effects of thermosyphons around tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2016,121:237-249. |
| APA | Mu, Yanhu,Li, Guoyu,Yu, Qihao,Ma, Wei,Wang, Dayan,&Wang, Fei.(2016).Numerical study of long-term cooling effects of thermosyphons around tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line.COLD REGIONS SCIENCE AND TECHNOLOGY,121,237-249. |
| MLA | Mu, Yanhu,et al."Numerical study of long-term cooling effects of thermosyphons around tower footings in permafrost regions along the Qinghai-Tibet Power Transmission Line".COLD REGIONS SCIENCE AND TECHNOLOGY 121(2016):237-249. |
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来源：寒区旱区环境与工程研究所
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