Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas
Introduction: The embankment in the permafrost zone of the Qinghai–Tibet Railway (QTR) faces the problem of permafrost degradation, especially in the warm and ice-rich permafrost areas. The settlement deformation of the embankment is more serious in these areas.Methods: This study systematically inv...
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ftdoajarticles:oai:doaj.org/article:a50641e724884a6f8c91152bacac0691 2023-05-15T16:37:18+02:00 Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas Yuezhen Xu Mingde Shen Zhiwei Zhou Wei Ma Guoyu Li Dun Chen 2023-02-01T00:00:00Z https://doi.org/10.3389/fenvs.2023.1082354 https://doaj.org/article/a50641e724884a6f8c91152bacac0691 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fenvs.2023.1082354/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2023.1082354 https://doaj.org/article/a50641e724884a6f8c91152bacac0691 Frontiers in Environmental Science, Vol 11 (2023) warm permafrost zones embankment settlement embankment types shady–sunny effect permafrost temperature Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.3389/fenvs.2023.1082354 2023-02-26T01:32:23Z Introduction: The embankment in the permafrost zone of the Qinghai–Tibet Railway (QTR) faces the problem of permafrost degradation, especially in the warm and ice-rich permafrost areas. The settlement deformation of the embankment is more serious in these areas.Methods: This study systematically investigates the settlement deformation characteristics during 16 operational years of three types of typical roadbed structures. The traditional embankment (TE), U-shaped crushed-rock embankment (UCRE), and crushed-rock revetment embankment (CRRE) are the roadbed structures. The long-term monitoring ground temperature and deformation data of the embankment section along the QTR in warm permafrost areas from 2005 to 2020 are utilized in analysis.Results and Discussion: This study focuses on the influence law of the roadbed structure form, shady–sunny slope effect, and temperature field change on the settlement of the roadbed. The results indicated that the two types of the crushed-rock embankment (CRE) of the long-term cumulative settlement are less than 50% of the cumulative settlement of the TE, and the impact on controlling the settlement is significant. The annual settlements of the three types of embankment structures are related to the artificial permafrost table (APT) and influenced by cyclical climate change at the regional scale. The annual growth rate of the settlement at the left and right shoulders of the UCRE as a result of the effect of the shady–sunny slope does not vary considerably as the number of operational years increases. The impact of the shady–sunny slope on the CRRE for the various settlements before 2008 was negligible. After 2008, the thermal disturbance to the embankment temperature field induced by the preconstruction and the effect of shady–sunny slopes decreased gradually as the number of operational years increased. In some years of operation, a thawed interlayer in the TE and CRRE greatly affected the embankment settlement acceleration. The settlement growth rate of the TE is related to ... Article in Journal/Newspaper Ice permafrost Directory of Open Access Journals: DOAJ Articles Frontiers in Environmental Science 11 |
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warm permafrost zones embankment settlement embankment types shady–sunny effect permafrost temperature Environmental sciences GE1-350 |
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warm permafrost zones embankment settlement embankment types shady–sunny effect permafrost temperature Environmental sciences GE1-350 Yuezhen Xu Mingde Shen Zhiwei Zhou Wei Ma Guoyu Li Dun Chen Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
topic_facet |
warm permafrost zones embankment settlement embankment types shady–sunny effect permafrost temperature Environmental sciences GE1-350 |
description |
Introduction: The embankment in the permafrost zone of the Qinghai–Tibet Railway (QTR) faces the problem of permafrost degradation, especially in the warm and ice-rich permafrost areas. The settlement deformation of the embankment is more serious in these areas.Methods: This study systematically investigates the settlement deformation characteristics during 16 operational years of three types of typical roadbed structures. The traditional embankment (TE), U-shaped crushed-rock embankment (UCRE), and crushed-rock revetment embankment (CRRE) are the roadbed structures. The long-term monitoring ground temperature and deformation data of the embankment section along the QTR in warm permafrost areas from 2005 to 2020 are utilized in analysis.Results and Discussion: This study focuses on the influence law of the roadbed structure form, shady–sunny slope effect, and temperature field change on the settlement of the roadbed. The results indicated that the two types of the crushed-rock embankment (CRE) of the long-term cumulative settlement are less than 50% of the cumulative settlement of the TE, and the impact on controlling the settlement is significant. The annual settlements of the three types of embankment structures are related to the artificial permafrost table (APT) and influenced by cyclical climate change at the regional scale. The annual growth rate of the settlement at the left and right shoulders of the UCRE as a result of the effect of the shady–sunny slope does not vary considerably as the number of operational years increases. The impact of the shady–sunny slope on the CRRE for the various settlements before 2008 was negligible. After 2008, the thermal disturbance to the embankment temperature field induced by the preconstruction and the effect of shady–sunny slopes decreased gradually as the number of operational years increased. In some years of operation, a thawed interlayer in the TE and CRRE greatly affected the embankment settlement acceleration. The settlement growth rate of the TE is related to ... |
format |
Article in Journal/Newspaper |
author |
Yuezhen Xu Mingde Shen Zhiwei Zhou Wei Ma Guoyu Li Dun Chen |
author_facet |
Yuezhen Xu Mingde Shen Zhiwei Zhou Wei Ma Guoyu Li Dun Chen |
author_sort |
Yuezhen Xu |
title |
Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
title_short |
Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
title_full |
Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
title_fullStr |
Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
title_full_unstemmed |
Investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
title_sort |
investigating characteristics of the long-term settlement of railway embankments in warm permafrost areas |
publisher |
Frontiers Media S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fenvs.2023.1082354 https://doaj.org/article/a50641e724884a6f8c91152bacac0691 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Frontiers in Environmental Science, Vol 11 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fenvs.2023.1082354/full https://doaj.org/toc/2296-665X 2296-665X doi:10.3389/fenvs.2023.1082354 https://doaj.org/article/a50641e724884a6f8c91152bacac0691 |
op_doi |
https://doi.org/10.3389/fenvs.2023.1082354 |
container_title |
Frontiers in Environmental Science |
container_volume |
11 |
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1766027595297587200 |