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Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure

In this paper, the strength and deformation failure characteristics of bearing coal rock mass are related to the confining pressure, and the SAS-2000 experimental system is used to carry out uniaxial and 3, 6, and 9 MPa triaxial tests on coal rock to assess the strength and deformation failure chara...

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Autores principales: Shan, Pengfei, Li, Wei, Lai, Xingping, Zhang, Shuai, Chen, Xingzhou, Wu, Xiaochen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10144027/
https://www.ncbi.nlm.nih.gov/pubmed/37110071
http://dx.doi.org/10.3390/ma16083235
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author Shan, Pengfei
Li, Wei
Lai, Xingping
Zhang, Shuai
Chen, Xingzhou
Wu, Xiaochen
author_facet Shan, Pengfei
Li, Wei
Lai, Xingping
Zhang, Shuai
Chen, Xingzhou
Wu, Xiaochen
author_sort Shan, Pengfei
collection PubMed
description In this paper, the strength and deformation failure characteristics of bearing coal rock mass are related to the confining pressure, and the SAS-2000 experimental system is used to carry out uniaxial and 3, 6, and 9 MPa triaxial tests on coal rock to assess the strength and deformation failure characteristics of coal rock under different confining pressure conditions. The results show that the stress–strain curve of coal rock undergoes four evolutionary stages after fracture: compaction, elasticity, plasticity, and rupture. With confining pressure, the peak strength of coal rock increases, and the elastic modulus increases nonlinearly. The coal sample changes more with confining pressure, and the elastic modulus is generally smaller than that of fine sandstone. The stage of evolution under confining pressure constitutes the failure process of coal rock, with the stress of different evolution stages causing various degrees of damage to coal rock. In the initial compaction stage, the unique pore structure of the coal sample makes the confining pressure effect more apparent; the confining pressure makes the bearing capacity of the coal rock plastic stage stronger, the residual strength of the coal sample has a linear relationship with the confining pressure, and the residual strength of the fine sandstone has a nonlinear relationship with the confining pressure. Changing the confining pressure state will cause the two kinds of coal rock samples to change from brittle failure to plastic failure. Different coal rocks under uniaxial compression experience more brittle failure, and the overall degree of crushing is higher. The coal sample in the triaxial state experiences predominantly ductile fracture. The whole is relatively complete after failure as a shear failure occurs. The fine sandstone specimen experiences brittle failure. The degree of failure is low, and the confining pressure’s effect on the coal sample is obvious.
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spelling pubmed-101440272023-04-29 Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure Shan, Pengfei Li, Wei Lai, Xingping Zhang, Shuai Chen, Xingzhou Wu, Xiaochen Materials (Basel) Article In this paper, the strength and deformation failure characteristics of bearing coal rock mass are related to the confining pressure, and the SAS-2000 experimental system is used to carry out uniaxial and 3, 6, and 9 MPa triaxial tests on coal rock to assess the strength and deformation failure characteristics of coal rock under different confining pressure conditions. The results show that the stress–strain curve of coal rock undergoes four evolutionary stages after fracture: compaction, elasticity, plasticity, and rupture. With confining pressure, the peak strength of coal rock increases, and the elastic modulus increases nonlinearly. The coal sample changes more with confining pressure, and the elastic modulus is generally smaller than that of fine sandstone. The stage of evolution under confining pressure constitutes the failure process of coal rock, with the stress of different evolution stages causing various degrees of damage to coal rock. In the initial compaction stage, the unique pore structure of the coal sample makes the confining pressure effect more apparent; the confining pressure makes the bearing capacity of the coal rock plastic stage stronger, the residual strength of the coal sample has a linear relationship with the confining pressure, and the residual strength of the fine sandstone has a nonlinear relationship with the confining pressure. Changing the confining pressure state will cause the two kinds of coal rock samples to change from brittle failure to plastic failure. Different coal rocks under uniaxial compression experience more brittle failure, and the overall degree of crushing is higher. The coal sample in the triaxial state experiences predominantly ductile fracture. The whole is relatively complete after failure as a shear failure occurs. The fine sandstone specimen experiences brittle failure. The degree of failure is low, and the confining pressure’s effect on the coal sample is obvious. MDPI 2023-04-19 /pmc/articles/PMC10144027/ /pubmed/37110071 http://dx.doi.org/10.3390/ma16083235 Text en © 2023 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
Shan, Pengfei
Li, Wei
Lai, Xingping
Zhang, Shuai
Chen, Xingzhou
Wu, Xiaochen
Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title_full Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title_fullStr Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title_full_unstemmed Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title_short Research on the Response Mechanism of Coal Rock Mass under Stress and Pressure
title_sort research on the response mechanism of coal rock mass under stress and pressure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10144027/
https://www.ncbi.nlm.nih.gov/pubmed/37110071
http://dx.doi.org/10.3390/ma16083235
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