Estimation on settlement of precast tower footings along the Qinghai-Tibet Power Transmission Line in warm permafrost regions
文献类型：期刊论文
| 作者 | Zhang, Jianming; Ruan, Guofeng; Su, Kai; Zhang, Hu |
| 刊名 | COLD REGIONS SCIENCE AND TECHNOLOGY
 |
| 出版日期 | 2016 |
| 卷号 | 121页码:275-281 |
| 关键词 | Precast footing Warm and ice-rich permafrost Climate warming Numerical simulation Thaw settlement process |
| ISSN号 | 0165-232X |
| DOI | 10.1016/j.coldregions.2015.04.011 |
| 通讯作者 | Zhang, Jianming() |
| 英文摘要 | In order to mitigate frost jacking of the foundations, most of the towers in permafrost regions along the Qinghai-Tibet Power Transmission Line from Golmud, Qinghai Province to Lhasa, Tibet Autonomous Region, China were installed on precast or cast-in-place footings. However, the monitoring data showed that these footings were suffering more from settlement rather than heave due to the settlement of the warm and ice-rich permafrost under the footings. In order to estimate the long-term settlement of these footings, a series of numerical simulations were conducted for predicting the changes in ground temperatures under the precast footings in the coming 50 years, taking three mean annual ground temperatures (MAGTs) of permafrost (-0.5, -1.0 and -1.5 degrees C), two moisture contents of foundation soils (20, 35 and 55%), two embedding depths of footings (3.7 and 5.8 m), and the most intense scenario of climate warming (linear rate of +0.052 degrees C/a) into account. Then, the settlement processes of the foundation soils were calculated by using the layer summation method in which the thaw consolidation of permafrost soils as well as the compression of plastic frozen soils under the footings were considered. The computation results show that due to climate warming and disturbances of the ground surfaces, major settlement of the foundation soils would occur after 20 or 30 years of operation. Additionally, the compression of plastic frozen soils under the footings could considerably contribute to the total settlement of foundation soils. Furthermore, embedding depth of the footings would have a significant effect on both thermal and mechanical stability of the footings. When the embedding depth is set at 3.7 m, thawing of the permafrost beneath the footings would always happen in warm (MAGT > -1.0 degrees C) permafrost areas during the next 50 years, and the settlement of foundation soils could exceed 20 cm for all calculated conditions by the end of the 50th operating year. When it is 5.8 m, however, thawing of the permafrost would take place only in very warm (MAGT > -0.5 degrees C) permafrost areas, and the settlement of foundation soils would be less than 20 cm by the end of the 50th operating year. (C) 2015 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| 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:000367111400027 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2557158 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Zhang, Jianming |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Jianming,Ruan, Guofeng,Su, Kai,et al. Estimation on settlement of precast tower footings along the Qinghai-Tibet Power Transmission Line in warm permafrost regions[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2016,121:275-281. |
| APA | Zhang, Jianming,Ruan, Guofeng,Su, Kai,&Zhang, Hu.(2016).Estimation on settlement of precast tower footings along the Qinghai-Tibet Power Transmission Line in warm permafrost regions.COLD REGIONS SCIENCE AND TECHNOLOGY,121,275-281. |
| MLA | Zhang, Jianming,et al."Estimation on settlement of precast tower footings along the Qinghai-Tibet Power Transmission Line in warm permafrost regions".COLD REGIONS SCIENCE AND TECHNOLOGY 121(2016):275-281. |
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来源：寒区旱区环境与工程研究所
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