Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation
The cone-cylindrical pile foundation is a kind of shallow buried foundation, which needs to be open excavated and backfilled during construction. The density of the backfill is closely related to the refreezing process of the backfill. However, there is still a lack of relevant research on the relat...
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ftdoajarticles:oai:doaj.org/article:75868932cc774b8693527cc8851f981a 2023-05-15T17:57:59+02:00 Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation Jun Zhang Chenglin Zhou Ze Zhang Andrey Melnikov Doudou Jin Shengrong Zhang 2022-03-01T00:00:00Z https://doi.org/10.3390/en15072329 https://doaj.org/article/75868932cc774b8693527cc8851f981a EN eng MDPI AG https://www.mdpi.com/1996-1073/15/7/2329 https://doaj.org/toc/1996-1073 doi:10.3390/en15072329 1996-1073 https://doaj.org/article/75868932cc774b8693527cc8851f981a Energies, Vol 15, Iss 2329, p 2329 (2022) refreezing process foundation backfill freeze–thaw cycles permafrost region Technology T article 2022 ftdoajarticles https://doi.org/10.3390/en15072329 2022-12-30T23:39:11Z The cone-cylindrical pile foundation is a kind of shallow buried foundation, which needs to be open excavated and backfilled during construction. The density of the backfill is closely related to the refreezing process of the backfill. However, there is still a lack of relevant research on the relationship between backfill density and the refreezing process of backfill. The method of model experiment is selected to study the refreezing process of backfill under three backfill soil densities. The controlled density of backfill is 1.83, 1.62 and 1.36 g/cm 3 , and the times of freeze–thaw cycle is 14, 22 and 39, respectively. The main research findings are as follows: First, the effect of the initial temperature of the backfill on the refreezing is mainly reflected in the first three freeze–thaw cycles; the second is that the higher the density of the backfill, the faster the backfill responds to changes in outside air temperature, and the shorter the freezing time; third, the pile foundation is a good conductor of heat, which will cause the soil temperature change on the pile side to be significantly greater than that of the natural soil, and the temperature change of the pile foundation surface is greater than that of the backfill. The research results can provide a reference for the backfill construction of pile foundations in cold regions and the selection of boundary conditions for related numerical simulations. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Energies 15 7 2329 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
refreezing process foundation backfill freeze–thaw cycles permafrost region Technology T |
spellingShingle |
refreezing process foundation backfill freeze–thaw cycles permafrost region Technology T Jun Zhang Chenglin Zhou Ze Zhang Andrey Melnikov Doudou Jin Shengrong Zhang Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
topic_facet |
refreezing process foundation backfill freeze–thaw cycles permafrost region Technology T |
description |
The cone-cylindrical pile foundation is a kind of shallow buried foundation, which needs to be open excavated and backfilled during construction. The density of the backfill is closely related to the refreezing process of the backfill. However, there is still a lack of relevant research on the relationship between backfill density and the refreezing process of backfill. The method of model experiment is selected to study the refreezing process of backfill under three backfill soil densities. The controlled density of backfill is 1.83, 1.62 and 1.36 g/cm 3 , and the times of freeze–thaw cycle is 14, 22 and 39, respectively. The main research findings are as follows: First, the effect of the initial temperature of the backfill on the refreezing is mainly reflected in the first three freeze–thaw cycles; the second is that the higher the density of the backfill, the faster the backfill responds to changes in outside air temperature, and the shorter the freezing time; third, the pile foundation is a good conductor of heat, which will cause the soil temperature change on the pile side to be significantly greater than that of the natural soil, and the temperature change of the pile foundation surface is greater than that of the backfill. The research results can provide a reference for the backfill construction of pile foundations in cold regions and the selection of boundary conditions for related numerical simulations. |
format |
Article in Journal/Newspaper |
author |
Jun Zhang Chenglin Zhou Ze Zhang Andrey Melnikov Doudou Jin Shengrong Zhang |
author_facet |
Jun Zhang Chenglin Zhou Ze Zhang Andrey Melnikov Doudou Jin Shengrong Zhang |
author_sort |
Jun Zhang |
title |
Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
title_short |
Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
title_full |
Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
title_fullStr |
Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
title_full_unstemmed |
Physical Model Test and Heat Transfer Analysis on Backfilling Construction of Qinghai-Tibet Transmission Line Tower Foundation |
title_sort |
physical model test and heat transfer analysis on backfilling construction of qinghai-tibet transmission line tower foundation |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/en15072329 https://doaj.org/article/75868932cc774b8693527cc8851f981a |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Energies, Vol 15, Iss 2329, p 2329 (2022) |
op_relation |
https://www.mdpi.com/1996-1073/15/7/2329 https://doaj.org/toc/1996-1073 doi:10.3390/en15072329 1996-1073 https://doaj.org/article/75868932cc774b8693527cc8851f981a |
op_doi |
https://doi.org/10.3390/en15072329 |
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Energies |
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15 |
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2329 |
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1766166509302841344 |