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Experimental study on the effect of high-temperature oxidation coal mechanical characteristics

After long-term oxidation and energy storage, broken coal body borehole walls and drainage shaft walls may cause spontaneous combustion during gas extraction. The high-temperature thermal shock caused by the spontaneous combustion of coal incurs thermal damage on adjacent coal, which, in turn, cause...

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Autores principales: Wang, Xiaoqi, Ma, Heng, Qi, Xiaohan, Gao, Ke, Li, Shengnan, Yang, Xuesong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8856550/
https://www.ncbi.nlm.nih.gov/pubmed/35180275
http://dx.doi.org/10.1371/journal.pone.0264039
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author Wang, Xiaoqi
Ma, Heng
Qi, Xiaohan
Gao, Ke
Li, Shengnan
Yang, Xuesong
author_facet Wang, Xiaoqi
Ma, Heng
Qi, Xiaohan
Gao, Ke
Li, Shengnan
Yang, Xuesong
author_sort Wang, Xiaoqi
collection PubMed
description After long-term oxidation and energy storage, broken coal body borehole walls and drainage shaft walls may cause spontaneous combustion during gas extraction. The high-temperature thermal shock caused by the spontaneous combustion of coal incurs thermal damage on adjacent coal, which, in turn, causes changes in the mechanical properties of the coal. However, only a few studies have been conducted in this context, which has limited our understanding of the thermal damage characteristics of coal bodies in such situations. This study aimed to experimentally investigate the correlation between the crack evolution law and the mechanical properties of coal bodies at different temperatures (50–300°C) using heat-force loading considering Ping Mei No. 10 coal mine as the research object. The results suggest that the coal body experiences a large amount of visible damage, and becomes increasingly complex. At 50–300°C, some indexes (such as longitudinal wave velocity, Poisson’s ratio, compressive strength, elastic modulus, impact energy index, and pre-peak strain) are positively correlated with temperature. In addition, the dynamic failure time and temperature show a negative correlation, and the overall change slope is small. The relationship between each index and temperature at 200–300°C is opposite to that at 50–200°C, and the overall change slope is larger. Moreover, when the oxidation temperature exceeds 200°C, the destruction of the coal body changes from elastic brittleness to ductility-plasticity. High-temperature oxidation incurs irreversible thermal damage of coal. Hence, it is necessary to focus on the changes in mechanical properties of coal after a spontaneous combustion process is extinguished.
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spelling pubmed-88565502022-02-19 Experimental study on the effect of high-temperature oxidation coal mechanical characteristics Wang, Xiaoqi Ma, Heng Qi, Xiaohan Gao, Ke Li, Shengnan Yang, Xuesong PLoS One Research Article After long-term oxidation and energy storage, broken coal body borehole walls and drainage shaft walls may cause spontaneous combustion during gas extraction. The high-temperature thermal shock caused by the spontaneous combustion of coal incurs thermal damage on adjacent coal, which, in turn, causes changes in the mechanical properties of the coal. However, only a few studies have been conducted in this context, which has limited our understanding of the thermal damage characteristics of coal bodies in such situations. This study aimed to experimentally investigate the correlation between the crack evolution law and the mechanical properties of coal bodies at different temperatures (50–300°C) using heat-force loading considering Ping Mei No. 10 coal mine as the research object. The results suggest that the coal body experiences a large amount of visible damage, and becomes increasingly complex. At 50–300°C, some indexes (such as longitudinal wave velocity, Poisson’s ratio, compressive strength, elastic modulus, impact energy index, and pre-peak strain) are positively correlated with temperature. In addition, the dynamic failure time and temperature show a negative correlation, and the overall change slope is small. The relationship between each index and temperature at 200–300°C is opposite to that at 50–200°C, and the overall change slope is larger. Moreover, when the oxidation temperature exceeds 200°C, the destruction of the coal body changes from elastic brittleness to ductility-plasticity. High-temperature oxidation incurs irreversible thermal damage of coal. Hence, it is necessary to focus on the changes in mechanical properties of coal after a spontaneous combustion process is extinguished. Public Library of Science 2022-02-18 /pmc/articles/PMC8856550/ /pubmed/35180275 http://dx.doi.org/10.1371/journal.pone.0264039 Text en © 2022 Wang et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Wang, Xiaoqi
Ma, Heng
Qi, Xiaohan
Gao, Ke
Li, Shengnan
Yang, Xuesong
Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title_full Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title_fullStr Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title_full_unstemmed Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title_short Experimental study on the effect of high-temperature oxidation coal mechanical characteristics
title_sort experimental study on the effect of high-temperature oxidation coal mechanical characteristics
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8856550/
https://www.ncbi.nlm.nih.gov/pubmed/35180275
http://dx.doi.org/10.1371/journal.pone.0264039
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