Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess
Qinghai is located in a permafrost region, which belongs to the continental climate zone of the the Qinghai-Tibet Plateau. At the same time, freezing-thawing cycles are common destructive factors for roadbeds and foundations. In order to examine the effects of freezing-thawing cycles on actual proje...
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ftdoajarticles:oai:doaj.org/article:ac6ee14e50b54036b7db618faf5f0f59 2023-05-15T17:58:08+02:00 Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess Leqing LIU Wuyu ZHANG Bingyin ZHANG Yuxi GU Banglong XIE 2021-07-01T00:00:00Z https://doi.org/10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/article/ac6ee14e50b54036b7db618faf5f0f59 ZH chi Editorial Office of Hydrogeology & Engineering Geology https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/toc/1000-3665 1000-3665 doi:10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/article/ac6ee14e50b54036b7db618faf5f0f59 Shuiwen dizhi gongcheng dizhi, Vol 48, Iss 4, Pp 109-115 (2021) freezing-thawing cycle loess temperature mechanical properties micromechanism Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.16030/j.cnki.issn.1000-3665.202009064 2023-02-12T01:30:47Z Qinghai is located in a permafrost region, which belongs to the continental climate zone of the the Qinghai-Tibet Plateau. At the same time, freezing-thawing cycles are common destructive factors for roadbeds and foundations. In order to examine the effects of freezing-thawing cycles on actual projects in Qinghai and reveal the mechanisms of freezing-thawing cycles on damage of the projects, the freezing-thawing cycle test, unconfined compressive strength test and electron microscope scanning test of the undisturbed loess and remolded loess in the Xining area of Qinghai are conducted to analyze the influence of different freezing-thawing temperatures and different freezing-thawing cycles on the strength and microstructure of the undisturbed loess and remolded loess. The results show that when the loess undergoes 0-6 freezing-thawing cycles, the strength of the undisturbed loess and remolded loess gradually decreases. After 8-10 freezing-thawing cycles, the unconfined compressive strength of the loess first increases and then tends to be basically stable. The strength of the undisturbed loess decreases with the decrease of the freezing and thawing temperature. However, the strength of the remolded loess first increases and then decreases with the decrease of temperature. From a microscopic point of view, the decrease in freezing-thawing temperature and the increase in the number of freezing-thawing cycles both lead to the decomposition of large loess particles into small particles, and the arrangement of the particles has changed. The results are of reference value for actual project construction and construction in the Xining area of Qinghai. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
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topic |
freezing-thawing cycle loess temperature mechanical properties micromechanism Geology QE1-996.5 |
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freezing-thawing cycle loess temperature mechanical properties micromechanism Geology QE1-996.5 Leqing LIU Wuyu ZHANG Bingyin ZHANG Yuxi GU Banglong XIE Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
topic_facet |
freezing-thawing cycle loess temperature mechanical properties micromechanism Geology QE1-996.5 |
description |
Qinghai is located in a permafrost region, which belongs to the continental climate zone of the the Qinghai-Tibet Plateau. At the same time, freezing-thawing cycles are common destructive factors for roadbeds and foundations. In order to examine the effects of freezing-thawing cycles on actual projects in Qinghai and reveal the mechanisms of freezing-thawing cycles on damage of the projects, the freezing-thawing cycle test, unconfined compressive strength test and electron microscope scanning test of the undisturbed loess and remolded loess in the Xining area of Qinghai are conducted to analyze the influence of different freezing-thawing temperatures and different freezing-thawing cycles on the strength and microstructure of the undisturbed loess and remolded loess. The results show that when the loess undergoes 0-6 freezing-thawing cycles, the strength of the undisturbed loess and remolded loess gradually decreases. After 8-10 freezing-thawing cycles, the unconfined compressive strength of the loess first increases and then tends to be basically stable. The strength of the undisturbed loess decreases with the decrease of the freezing and thawing temperature. However, the strength of the remolded loess first increases and then decreases with the decrease of temperature. From a microscopic point of view, the decrease in freezing-thawing temperature and the increase in the number of freezing-thawing cycles both lead to the decomposition of large loess particles into small particles, and the arrangement of the particles has changed. The results are of reference value for actual project construction and construction in the Xining area of Qinghai. |
format |
Article in Journal/Newspaper |
author |
Leqing LIU Wuyu ZHANG Bingyin ZHANG Yuxi GU Banglong XIE |
author_facet |
Leqing LIU Wuyu ZHANG Bingyin ZHANG Yuxi GU Banglong XIE |
author_sort |
Leqing LIU |
title |
Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
title_short |
Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
title_full |
Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
title_fullStr |
Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
title_full_unstemmed |
Effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
title_sort |
effect of freezing-thawing cycles on mechanical properties and microscopic mechanisms of loess |
publisher |
Editorial Office of Hydrogeology & Engineering Geology |
publishDate |
2021 |
url |
https://doi.org/10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/article/ac6ee14e50b54036b7db618faf5f0f59 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Shuiwen dizhi gongcheng dizhi, Vol 48, Iss 4, Pp 109-115 (2021) |
op_relation |
https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/toc/1000-3665 1000-3665 doi:10.16030/j.cnki.issn.1000-3665.202009064 https://doaj.org/article/ac6ee14e50b54036b7db618faf5f0f59 |
op_doi |
https://doi.org/10.16030/j.cnki.issn.1000-3665.202009064 |
_version_ |
1766166681852313600 |