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Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body

[Image: see text] A mount of bedding and cleat in a coal body causes that the mechanical property and gas permeability are anisotropic in a coal seam, partly. To reveal the permeability change law of the impacted coal, a self-developed vertical split Hopkinson pressure bar (SHPB) device is used to c...

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Autores principales: Li, Minmin, Liang, Weimin, Yue, Gaowei, Yue, Jiwei, Zheng, Xinjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7203995/
https://www.ncbi.nlm.nih.gov/pubmed/32391483
http://dx.doi.org/10.1021/acsomega.0c00269
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author Li, Minmin
Liang, Weimin
Yue, Gaowei
Yue, Jiwei
Zheng, Xinjun
author_facet Li, Minmin
Liang, Weimin
Yue, Gaowei
Yue, Jiwei
Zheng, Xinjun
author_sort Li, Minmin
collection PubMed
description [Image: see text] A mount of bedding and cleat in a coal body causes that the mechanical property and gas permeability are anisotropic in a coal seam, partly. To reveal the permeability change law of the impacted coal, a self-developed vertical split Hopkinson pressure bar (SHPB) device is used to carry out the dynamic impact mechanical property tests of coal samples in three different coring directions under five impact loads and then the permeability of the impacted coal samples is measured by a permeability measuring instrument under different gas pressures. Finally, a calculation model for the anisotropic coal permeability is established to analyze the permeability distribution law in any direction with different angles to the bedding plane. The results show that with an increase in impact height the dynamic peak stress of coal samples increases gradually, which shows a linear growth relationship. The permeability of the impacted coal samples is much larger than that of raw coal samples, and the bigger the impact load, the larger the permeability. Moreover, under the same impact load and gas pressure, the permeability is the largest in parallel to the bedding direction, followed by that in oblique 45° to the bedding direction, and the smallest in perpendicular to the bedding direction. The permeability calculated by the anisotropic model in oblique 45° to the bedding direction is in good agreement with the measured results, and the errors are no more than 10%, which will provide a theoretical basis for the permeability distribution law of the coal seam after deep-hole blasting.
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spelling pubmed-72039952020-05-08 Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body Li, Minmin Liang, Weimin Yue, Gaowei Yue, Jiwei Zheng, Xinjun ACS Omega [Image: see text] A mount of bedding and cleat in a coal body causes that the mechanical property and gas permeability are anisotropic in a coal seam, partly. To reveal the permeability change law of the impacted coal, a self-developed vertical split Hopkinson pressure bar (SHPB) device is used to carry out the dynamic impact mechanical property tests of coal samples in three different coring directions under five impact loads and then the permeability of the impacted coal samples is measured by a permeability measuring instrument under different gas pressures. Finally, a calculation model for the anisotropic coal permeability is established to analyze the permeability distribution law in any direction with different angles to the bedding plane. The results show that with an increase in impact height the dynamic peak stress of coal samples increases gradually, which shows a linear growth relationship. The permeability of the impacted coal samples is much larger than that of raw coal samples, and the bigger the impact load, the larger the permeability. Moreover, under the same impact load and gas pressure, the permeability is the largest in parallel to the bedding direction, followed by that in oblique 45° to the bedding direction, and the smallest in perpendicular to the bedding direction. The permeability calculated by the anisotropic model in oblique 45° to the bedding direction is in good agreement with the measured results, and the errors are no more than 10%, which will provide a theoretical basis for the permeability distribution law of the coal seam after deep-hole blasting. American Chemical Society 2020-04-21 /pmc/articles/PMC7203995/ /pubmed/32391483 http://dx.doi.org/10.1021/acsomega.0c00269 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Li, Minmin
Liang, Weimin
Yue, Gaowei
Yue, Jiwei
Zheng, Xinjun
Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title_full Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title_fullStr Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title_full_unstemmed Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title_short Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
title_sort experiment and modeling of permeability under different impact loads in a structural anisotropic coal body
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7203995/
https://www.ncbi.nlm.nih.gov/pubmed/32391483
http://dx.doi.org/10.1021/acsomega.0c00269
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