Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions
This study reveals the thermal control mechanism of a ventilated–closed block layer composite embankment structure by analyzing the heat transfer and temperature change based on the measured data of the high-grade highway experimental engineering in the Beiluhe area of the Qinghai–Tibet Plateau. Dur...
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crcansciencepubl:10.1139/cgj-2023-0037 2023-12-17T10:48:33+01:00 Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions Yuan, Chang Yu, Qi-hao Li, Dong-wei Chen, Xin Qian, Jin Wang, Zhenhua Lai, Yuan-ming 2023 http://dx.doi.org/10.1139/cgj-2023-0037 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2023-0037 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2023-0037 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 60, issue 9, page 1401-1414 ISSN 0008-3674 1208-6010 Civil and Structural Engineering Geotechnical Engineering and Engineering Geology journal-article 2023 crcansciencepubl https://doi.org/10.1139/cgj-2023-0037 2023-11-19T13:38:30Z This study reveals the thermal control mechanism of a ventilated–closed block layer composite embankment structure by analyzing the heat transfer and temperature change based on the measured data of the high-grade highway experimental engineering in the Beiluhe area of the Qinghai–Tibet Plateau. During the cold season, natural convection occurred in the block layer when the upper boundary temperature was approximately 2 °C lower than that of the bottom boundary. In addition, heat from the foundation was transferred upwards through the block layer via heat convection. During the warm season, air inside the block layer was almost static, and external heat was transferred downwards through the block layer via heat conduction. The equivalent thermal conductivity of the block layer in the cold season was approximately 17.4 times that of the warm season, and heat release through the block layer was 9.65 times that of heat absorption, exhibiting a thermal semiconductor effect. The results show that the frozen soil foundation was in net exothermic state, the permafrost table continuously rose, and the mean annual soil temperature continuously decreased above 14 m depth. This research can contribute to thermal control technology development and construction scheme selection of expressway in permafrost regions. Article in Journal/Newspaper permafrost Canadian Science Publishing (via Crossref) Canadian Geotechnical Journal 60 9 1401 1414 |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
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English |
topic |
Civil and Structural Engineering Geotechnical Engineering and Engineering Geology |
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Civil and Structural Engineering Geotechnical Engineering and Engineering Geology Yuan, Chang Yu, Qi-hao Li, Dong-wei Chen, Xin Qian, Jin Wang, Zhenhua Lai, Yuan-ming Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
topic_facet |
Civil and Structural Engineering Geotechnical Engineering and Engineering Geology |
description |
This study reveals the thermal control mechanism of a ventilated–closed block layer composite embankment structure by analyzing the heat transfer and temperature change based on the measured data of the high-grade highway experimental engineering in the Beiluhe area of the Qinghai–Tibet Plateau. During the cold season, natural convection occurred in the block layer when the upper boundary temperature was approximately 2 °C lower than that of the bottom boundary. In addition, heat from the foundation was transferred upwards through the block layer via heat convection. During the warm season, air inside the block layer was almost static, and external heat was transferred downwards through the block layer via heat conduction. The equivalent thermal conductivity of the block layer in the cold season was approximately 17.4 times that of the warm season, and heat release through the block layer was 9.65 times that of heat absorption, exhibiting a thermal semiconductor effect. The results show that the frozen soil foundation was in net exothermic state, the permafrost table continuously rose, and the mean annual soil temperature continuously decreased above 14 m depth. This research can contribute to thermal control technology development and construction scheme selection of expressway in permafrost regions. |
format |
Article in Journal/Newspaper |
author |
Yuan, Chang Yu, Qi-hao Li, Dong-wei Chen, Xin Qian, Jin Wang, Zhenhua Lai, Yuan-ming |
author_facet |
Yuan, Chang Yu, Qi-hao Li, Dong-wei Chen, Xin Qian, Jin Wang, Zhenhua Lai, Yuan-ming |
author_sort |
Yuan, Chang |
title |
Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
title_short |
Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
title_full |
Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
title_fullStr |
Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
title_full_unstemmed |
Thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
title_sort |
thermal control mechanism of ventilated–closed block layer composite embankment of expressway in warm permafrost regions |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1139/cgj-2023-0037 https://cdnsciencepub.com/doi/full-xml/10.1139/cgj-2023-0037 https://cdnsciencepub.com/doi/pdf/10.1139/cgj-2023-0037 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Canadian Geotechnical Journal volume 60, issue 9, page 1401-1414 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cgj-2023-0037 |
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Canadian Geotechnical Journal |
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60 |
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9 |
container_start_page |
1401 |
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1414 |
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1785572751484911616 |