Cargando…

Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength

The fracturing behaviors of serial coal pillars is significant for understanding their failure mechanism. To reveal this, the bearing stress, acoustic emission, electrical resistivity, local strain, force chain distribution, and cracks evolution of serial coal pillars under uniaxial compression were...

Descripción completa

Detalles Bibliográficos
Autores principales: Song, Cheng, Cao, Guangming, Bai, Jinwen, Wang, Shanyong, Feng, Guorui, Shi, Xudong, Wang, Kai, Zhu, Chun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095767/
https://www.ncbi.nlm.nih.gov/pubmed/37048983
http://dx.doi.org/10.3390/ma16072690
_version_ 1785024161984282624
author Song, Cheng
Cao, Guangming
Bai, Jinwen
Wang, Shanyong
Feng, Guorui
Shi, Xudong
Wang, Kai
Zhu, Chun
author_facet Song, Cheng
Cao, Guangming
Bai, Jinwen
Wang, Shanyong
Feng, Guorui
Shi, Xudong
Wang, Kai
Zhu, Chun
author_sort Song, Cheng
collection PubMed
description The fracturing behaviors of serial coal pillars is significant for understanding their failure mechanism. To reveal this, the bearing stress, acoustic emission, electrical resistivity, local strain, force chain distribution, and cracks evolution of serial coal pillars under uniaxial compression were evaluated by experiment and numerical simulation. The results show that four bearing stages are observed during the fracturing process (i.e., nonlinear growth, linear growth, yielding growth, and weakening stages). The acoustic emission features, electrical resistivity responses, strain develops, force chain distributions, cracks evolutions, and local displacement are highly consistent to illustrate the fracturing behaviors. System fracturing of serial coal pillar specimens is appeared along with the collapse of lower uniaxial compressive strength coal pillar specimen. The limit bearing capacity of serial coal pillar specimens is almost equal to the strength of lower uniaxial compressive strength coal pillar specimen. The unbalanced deformation characteristics of serial coal pillar specimens are presented due to the strength differences. The evolution of the key deformation element is the rooted reason for the overall fracturing mechanism of serial coal pillar specimens. For serial coal pillar specimens with different strengths, the critical condition of system fracturing is that the sum of secant modulus of upper and bottom coal pillars is zero, which is expected to predict the system fracturing of serial pillars in the underground coal mining.
format Online
Article
Text
id pubmed-10095767
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-100957672023-04-13 Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength Song, Cheng Cao, Guangming Bai, Jinwen Wang, Shanyong Feng, Guorui Shi, Xudong Wang, Kai Zhu, Chun Materials (Basel) Article The fracturing behaviors of serial coal pillars is significant for understanding their failure mechanism. To reveal this, the bearing stress, acoustic emission, electrical resistivity, local strain, force chain distribution, and cracks evolution of serial coal pillars under uniaxial compression were evaluated by experiment and numerical simulation. The results show that four bearing stages are observed during the fracturing process (i.e., nonlinear growth, linear growth, yielding growth, and weakening stages). The acoustic emission features, electrical resistivity responses, strain develops, force chain distributions, cracks evolutions, and local displacement are highly consistent to illustrate the fracturing behaviors. System fracturing of serial coal pillar specimens is appeared along with the collapse of lower uniaxial compressive strength coal pillar specimen. The limit bearing capacity of serial coal pillar specimens is almost equal to the strength of lower uniaxial compressive strength coal pillar specimen. The unbalanced deformation characteristics of serial coal pillar specimens are presented due to the strength differences. The evolution of the key deformation element is the rooted reason for the overall fracturing mechanism of serial coal pillar specimens. For serial coal pillar specimens with different strengths, the critical condition of system fracturing is that the sum of secant modulus of upper and bottom coal pillars is zero, which is expected to predict the system fracturing of serial pillars in the underground coal mining. MDPI 2023-03-28 /pmc/articles/PMC10095767/ /pubmed/37048983 http://dx.doi.org/10.3390/ma16072690 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
Song, Cheng
Cao, Guangming
Bai, Jinwen
Wang, Shanyong
Feng, Guorui
Shi, Xudong
Wang, Kai
Zhu, Chun
Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title_full Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title_fullStr Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title_full_unstemmed Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title_short Fracturing Behaviors and Mechanism of Serial Coal Pillar Specimens with Different Strength
title_sort fracturing behaviors and mechanism of serial coal pillar specimens with different strength
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095767/
https://www.ncbi.nlm.nih.gov/pubmed/37048983
http://dx.doi.org/10.3390/ma16072690
work_keys_str_mv AT songcheng fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT caoguangming fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT baijinwen fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT wangshanyong fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT fengguorui fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT shixudong fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT wangkai fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength
AT zhuchun fracturingbehaviorsandmechanismofserialcoalpillarspecimenswithdifferentstrength