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Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading
In underground engineering, reinforcement is a necessary means to ensure the stability of surrounding rock. Due to the stress redistribution caused by excavation disturbances, the reinforced rock mass is frequently subjected to loading and unloading, and its mechanical properties change accordingly....
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9822174/ https://www.ncbi.nlm.nih.gov/pubmed/36614550 http://dx.doi.org/10.3390/ma16010211 |
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author | Zhang, Shuguang Li, Yanmo Yang, Juefeng Song, Yu Yang, Li Guo, Jiahao |
author_facet | Zhang, Shuguang Li, Yanmo Yang, Juefeng Song, Yu Yang, Li Guo, Jiahao |
author_sort | Zhang, Shuguang |
collection | PubMed |
description | In underground engineering, reinforcement is a necessary means to ensure the stability of surrounding rock. Due to the stress redistribution caused by excavation disturbances, the reinforced rock mass is frequently subjected to loading and unloading, and its mechanical properties change accordingly. Based on the above engineering practice, using pasted circular CFRP, an approximate simulation of the rock reinforcement effect of bolt and shotcrete support was performed. Triaxial cyclic loading and unloading tests of reinforced sandstone were carried out, and the influence of different reinforcement schemes on the mechanical properties was compared and analyzed. Furthermore, the strengthening mechanism, damage evolution, and energy transformation mechanism of CFRP are discussed. The results showed that the peak strength increased about 14.2% and 23.8% with the two reinforced schemes, and the residual strength increased about 27.3% and 52.8% with the increase in the area reinforced by CFRP. Under the same confining pressure and strain conditions, the characteristic energy density and elastic energy ratio increased with an increase in the reinforcement area, but the damage variable decreased. It is proved that CFRP can improve energy absorption efficiency, enhance the energy storage limit, and reduce dissipation efficiency. By inhibiting the propagation of internal fissures and limiting the energy dissipation during fractures, the rock mass can be restrained and strengthened. |
format | Online Article Text |
id | pubmed-9822174 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-98221742023-01-07 Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading Zhang, Shuguang Li, Yanmo Yang, Juefeng Song, Yu Yang, Li Guo, Jiahao Materials (Basel) Article In underground engineering, reinforcement is a necessary means to ensure the stability of surrounding rock. Due to the stress redistribution caused by excavation disturbances, the reinforced rock mass is frequently subjected to loading and unloading, and its mechanical properties change accordingly. Based on the above engineering practice, using pasted circular CFRP, an approximate simulation of the rock reinforcement effect of bolt and shotcrete support was performed. Triaxial cyclic loading and unloading tests of reinforced sandstone were carried out, and the influence of different reinforcement schemes on the mechanical properties was compared and analyzed. Furthermore, the strengthening mechanism, damage evolution, and energy transformation mechanism of CFRP are discussed. The results showed that the peak strength increased about 14.2% and 23.8% with the two reinforced schemes, and the residual strength increased about 27.3% and 52.8% with the increase in the area reinforced by CFRP. Under the same confining pressure and strain conditions, the characteristic energy density and elastic energy ratio increased with an increase in the reinforcement area, but the damage variable decreased. It is proved that CFRP can improve energy absorption efficiency, enhance the energy storage limit, and reduce dissipation efficiency. By inhibiting the propagation of internal fissures and limiting the energy dissipation during fractures, the rock mass can be restrained and strengthened. MDPI 2022-12-26 /pmc/articles/PMC9822174/ /pubmed/36614550 http://dx.doi.org/10.3390/ma16010211 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Shuguang Li, Yanmo Yang, Juefeng Song, Yu Yang, Li Guo, Jiahao Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title | Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title_full | Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title_fullStr | Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title_full_unstemmed | Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title_short | Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading |
title_sort | energy action mechanism of reinforced sandstone under triaxial cyclic loading and unloading |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9822174/ https://www.ncbi.nlm.nih.gov/pubmed/36614550 http://dx.doi.org/10.3390/ma16010211 |
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