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Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles

To investigate the micro-scale mechanism of strength deterioration under different times of dry–wet cycles, laboratory tests of physical properties, triaxial compression, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were conducted on red sandstone on reservoir bank slopes. The rese...

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Autores principales: Chen, Chao, Zhao, Baoyun, Zhang, Liyun, Huang, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10654736/
https://www.ncbi.nlm.nih.gov/pubmed/37973810
http://dx.doi.org/10.1038/s41598-023-47397-x
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author Chen, Chao
Zhao, Baoyun
Zhang, Liyun
Huang, Wei
author_facet Chen, Chao
Zhao, Baoyun
Zhang, Liyun
Huang, Wei
author_sort Chen, Chao
collection PubMed
description To investigate the micro-scale mechanism of strength deterioration under different times of dry–wet cycles, laboratory tests of physical properties, triaxial compression, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were conducted on red sandstone on reservoir bank slopes. The research results showed that when the 5th dry–wet cycle ended, the dry mass and peak strength started to rapidly decline, while the porosity and saturated mass increased rapidly. In general, all of these behaviours become relatively stable when the number of cycles increased. Similarly, cohesion and internal friction angle changed most significantly from 0 to 10 cycles and then became stable. In addition, the physical expansion of the adsorbed water film and the dissolution and expansion of mineral particles increased the number of internal microcracks and pores and the porosity and saturated mass of the sample. In addition, the pore fluid effect and fracture flow effect made the microcracks in the red sandstone grow and connect; thus, the peak strength of the sample decreased. Moreover, during the dry–wet cycles, the change in the relative content of mineral particles and the pore fluid effect weakened the clay cementation, and then the dry mass and cohesion of the samples decreased. The research reported in this paper will play a very significant role in the scientific analysis of slope stability in the Three Gorges Reservoir area.
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spelling pubmed-106547362023-11-16 Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles Chen, Chao Zhao, Baoyun Zhang, Liyun Huang, Wei Sci Rep Article To investigate the micro-scale mechanism of strength deterioration under different times of dry–wet cycles, laboratory tests of physical properties, triaxial compression, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were conducted on red sandstone on reservoir bank slopes. The research results showed that when the 5th dry–wet cycle ended, the dry mass and peak strength started to rapidly decline, while the porosity and saturated mass increased rapidly. In general, all of these behaviours become relatively stable when the number of cycles increased. Similarly, cohesion and internal friction angle changed most significantly from 0 to 10 cycles and then became stable. In addition, the physical expansion of the adsorbed water film and the dissolution and expansion of mineral particles increased the number of internal microcracks and pores and the porosity and saturated mass of the sample. In addition, the pore fluid effect and fracture flow effect made the microcracks in the red sandstone grow and connect; thus, the peak strength of the sample decreased. Moreover, during the dry–wet cycles, the change in the relative content of mineral particles and the pore fluid effect weakened the clay cementation, and then the dry mass and cohesion of the samples decreased. The research reported in this paper will play a very significant role in the scientific analysis of slope stability in the Three Gorges Reservoir area. Nature Publishing Group UK 2023-11-16 /pmc/articles/PMC10654736/ /pubmed/37973810 http://dx.doi.org/10.1038/s41598-023-47397-x Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Chen, Chao
Zhao, Baoyun
Zhang, Liyun
Huang, Wei
Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title_full Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title_fullStr Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title_full_unstemmed Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title_short Mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
title_sort mechanism of strength deterioration of red sandstone on reservoir bank slopes under the action of dry–wet cycles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10654736/
https://www.ncbi.nlm.nih.gov/pubmed/37973810
http://dx.doi.org/10.1038/s41598-023-47397-x
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