Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region
As the highest altitude and the longest plateau railway line, the Qinghai–Tibet railway passes through a large area of continuous permafrost. As the key position of the combination of roadbed and bridge, the stability and strength of the bridge approach directly affect the smoothness of the whole li...
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ftdoajarticles:oai:doaj.org/article:f1af545df85f47bfad94fd8f29b45a3d 2024-09-15T18:29:51+00:00 Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region Qixiang Yin Junjie Wu Boyang Zhang Mingjiao Hou 2024-05-01T00:00:00Z https://doi.org/10.3389/feart.2024.1394898 https://doaj.org/article/f1af545df85f47bfad94fd8f29b45a3d EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2024.1394898/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2024.1394898 https://doaj.org/article/f1af545df85f47bfad94fd8f29b45a3d Frontiers in Earth Science, Vol 12 (2024) bridge approach permafrost region gravel sandwich temperature field subgrade Science Q article 2024 ftdoajarticles https://doi.org/10.3389/feart.2024.1394898 2024-08-05T17:49:21Z As the highest altitude and the longest plateau railway line, the Qinghai–Tibet railway passes through a large area of continuous permafrost. As the key position of the combination of roadbed and bridge, the stability and strength of the bridge approach directly affect the smoothness of the whole line. Through an indoor model test, the distribution pattern of space temperature field and the change law of temperature measuring points in the bridge approach of gravel sandwich are studied. With the increase in the depth from the subgrade surface, the influence of the temperature change in the upper atmosphere decreases gradually at the 2.5-m platform back of the subgrade center section, resulting in an obvious lag in the subgrade. By comparing the temperature measurement data of different bridge approaches of the gravel interlayer road bridge and the bridge approach of the U-shaped block gravel road bridge, it is shown that the U-shaped structure not only has a better overall cooling effect, but also the cooling effect gradually increases with the increase in the distance from the abutment back. The influence range of the road–bridge transition section on the spatial temperature field is approximately 14 m in the back of the abutment, and the influence range at 7.5 m is the most severe. The research results have important practical significance and engineering application value for the operation and maintenance of the Qinghai–Tibet railway. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Frontiers in Earth Science 12 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
bridge approach permafrost region gravel sandwich temperature field subgrade Science Q |
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bridge approach permafrost region gravel sandwich temperature field subgrade Science Q Qixiang Yin Junjie Wu Boyang Zhang Mingjiao Hou Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
topic_facet |
bridge approach permafrost region gravel sandwich temperature field subgrade Science Q |
description |
As the highest altitude and the longest plateau railway line, the Qinghai–Tibet railway passes through a large area of continuous permafrost. As the key position of the combination of roadbed and bridge, the stability and strength of the bridge approach directly affect the smoothness of the whole line. Through an indoor model test, the distribution pattern of space temperature field and the change law of temperature measuring points in the bridge approach of gravel sandwich are studied. With the increase in the depth from the subgrade surface, the influence of the temperature change in the upper atmosphere decreases gradually at the 2.5-m platform back of the subgrade center section, resulting in an obvious lag in the subgrade. By comparing the temperature measurement data of different bridge approaches of the gravel interlayer road bridge and the bridge approach of the U-shaped block gravel road bridge, it is shown that the U-shaped structure not only has a better overall cooling effect, but also the cooling effect gradually increases with the increase in the distance from the abutment back. The influence range of the road–bridge transition section on the spatial temperature field is approximately 14 m in the back of the abutment, and the influence range at 7.5 m is the most severe. The research results have important practical significance and engineering application value for the operation and maintenance of the Qinghai–Tibet railway. |
format |
Article in Journal/Newspaper |
author |
Qixiang Yin Junjie Wu Boyang Zhang Mingjiao Hou |
author_facet |
Qixiang Yin Junjie Wu Boyang Zhang Mingjiao Hou |
author_sort |
Qixiang Yin |
title |
Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
title_short |
Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
title_full |
Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
title_fullStr |
Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
title_full_unstemmed |
Laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
title_sort |
laboratory investigation of the spatial thermodynamic properties of the bridge approach in the permafrost region |
publisher |
Frontiers Media S.A. |
publishDate |
2024 |
url |
https://doi.org/10.3389/feart.2024.1394898 https://doaj.org/article/f1af545df85f47bfad94fd8f29b45a3d |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Frontiers in Earth Science, Vol 12 (2024) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2024.1394898/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2024.1394898 https://doaj.org/article/f1af545df85f47bfad94fd8f29b45a3d |
op_doi |
https://doi.org/10.3389/feart.2024.1394898 |
container_title |
Frontiers in Earth Science |
container_volume |
12 |
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1810471306572857344 |