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Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Deep resource extraction has been affected by the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction. The creep characteristics of the perimeter...

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Autores principales: Liang, Zhonghao, Ji, Peizhi, Zhang, Yifan, Qin, Nan, Huang, Qiming, Yu, Zhuoqun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9519929/
https://www.ncbi.nlm.nih.gov/pubmed/36171398
http://dx.doi.org/10.1038/s41598-022-20505-z
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author Liang, Zhonghao
Ji, Peizhi
Zhang, Yifan
Qin, Nan
Huang, Qiming
Yu, Zhuoqun
author_facet Liang, Zhonghao
Ji, Peizhi
Zhang, Yifan
Qin, Nan
Huang, Qiming
Yu, Zhuoqun
author_sort Liang, Zhonghao
collection PubMed
description Deep resource extraction has been affected by the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction. The creep characteristics of the perimeter rocks are of great theoretical and practical value. Firstly, the triaxial pre-peak loading and unloading tests on the prepared samples are conducted on the intact rock samples using the TAW-200 rock mechanics test system. Then the rock samples with different degrees of pre-peak unloading damage were prepared under the condition of pre-peak yield. Finally, the uniaxial creep tests were carried out to study the uniaxial creep mechanical properties. The results show that the wave velocities of the damaged rock samples are reduced to different degrees compared with those of the intact rock samples, the creep of the pre-peak unloading damaged rock has a time-dependent damage effect, and the study results are similar to those of the conventional uniaxial creep test of the white sandstone. The instantaneous strain at all stress levels of the damaged rock samples increased gradually with the stress level, which is consistent with the non-linear functional relationship; Based on the time-dependent damage effect, the two-parameter Weibull distribution function was introduced into the West Plains viscoelasticity model, and a creep damage model for white sandstone was proposed. The improved Nishihara model can simulate the uniaxial creep characteristics of each damaged rock sample at various stress levels.
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spelling pubmed-95199292022-09-30 Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage Liang, Zhonghao Ji, Peizhi Zhang, Yifan Qin, Nan Huang, Qiming Yu, Zhuoqun Sci Rep Article Deep resource extraction has been affected by the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction. The creep characteristics of the perimeter rocks are of great theoretical and practical value. Firstly, the triaxial pre-peak loading and unloading tests on the prepared samples are conducted on the intact rock samples using the TAW-200 rock mechanics test system. Then the rock samples with different degrees of pre-peak unloading damage were prepared under the condition of pre-peak yield. Finally, the uniaxial creep tests were carried out to study the uniaxial creep mechanical properties. The results show that the wave velocities of the damaged rock samples are reduced to different degrees compared with those of the intact rock samples, the creep of the pre-peak unloading damaged rock has a time-dependent damage effect, and the study results are similar to those of the conventional uniaxial creep test of the white sandstone. The instantaneous strain at all stress levels of the damaged rock samples increased gradually with the stress level, which is consistent with the non-linear functional relationship; Based on the time-dependent damage effect, the two-parameter Weibull distribution function was introduced into the West Plains viscoelasticity model, and a creep damage model for white sandstone was proposed. The improved Nishihara model can simulate the uniaxial creep characteristics of each damaged rock sample at various stress levels. Nature Publishing Group UK 2022-09-28 /pmc/articles/PMC9519929/ /pubmed/36171398 http://dx.doi.org/10.1038/s41598-022-20505-z Text en © The Author(s) 2022 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
Liang, Zhonghao
Ji, Peizhi
Zhang, Yifan
Qin, Nan
Huang, Qiming
Yu, Zhuoqun
Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title_full Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title_fullStr Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title_full_unstemmed Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title_short Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
title_sort experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9519929/
https://www.ncbi.nlm.nih.gov/pubmed/36171398
http://dx.doi.org/10.1038/s41598-022-20505-z
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