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Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion

[Image: see text] The experimental and numerical responses of coal specimens were studied in this work. A supercritical CO(2) explosion experiment was carried out on the coal specimens using an independently developed triaxial load platform. The characteristics of crack generation in the specimens w...

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Autores principales: Sun, Keming, Chen, Peng, Zhang, Shucui, Li, Kai, Zhang, Xingang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8264853/
https://www.ncbi.nlm.nih.gov/pubmed/34250345
http://dx.doi.org/10.1021/acsomega.1c01450
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author Sun, Keming
Chen, Peng
Zhang, Shucui
Li, Kai
Zhang, Xingang
author_facet Sun, Keming
Chen, Peng
Zhang, Shucui
Li, Kai
Zhang, Xingang
author_sort Sun, Keming
collection PubMed
description [Image: see text] The experimental and numerical responses of coal specimens were studied in this work. A supercritical CO(2) explosion experiment was carried out on the coal specimens using an independently developed triaxial load platform. The characteristics of crack generation in the specimens were obtained for different initial stresses. For a better understanding of the influence of cleats in a coal seam, a MATLAB code is developed to identify the actual geometry of the cleat in the coal specimen images, enabling the geometric representation of coal with cleats. The fracturing of coal with cleats induced by supercritical CO(2) explosion under initial stress is validated using a combination of smoothed particle hydrodynamics and the finite-element method. The cleat can absorb and reflect the stress wave and hinder the propagation of cracks. According to the transmittance of the stress wave, the density and size of cracks that propagate through the cleat, the influences of the dip angle of the cleat, the aperture of the cleat, and the distance from the cleat to the center of the blast hole are discussed. The results show that the greater the distance from the cleat to the center of the blast hole or the greater the aperture of the cleat, the greater the hindrance of the cleat to the propagation of the cracks. With the increase of the dip angle of the cleat, the hindrance of the cleat to crack propagation first increases and then decreases.
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spelling pubmed-82648532021-07-09 Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion Sun, Keming Chen, Peng Zhang, Shucui Li, Kai Zhang, Xingang ACS Omega [Image: see text] The experimental and numerical responses of coal specimens were studied in this work. A supercritical CO(2) explosion experiment was carried out on the coal specimens using an independently developed triaxial load platform. The characteristics of crack generation in the specimens were obtained for different initial stresses. For a better understanding of the influence of cleats in a coal seam, a MATLAB code is developed to identify the actual geometry of the cleat in the coal specimen images, enabling the geometric representation of coal with cleats. The fracturing of coal with cleats induced by supercritical CO(2) explosion under initial stress is validated using a combination of smoothed particle hydrodynamics and the finite-element method. The cleat can absorb and reflect the stress wave and hinder the propagation of cracks. According to the transmittance of the stress wave, the density and size of cracks that propagate through the cleat, the influences of the dip angle of the cleat, the aperture of the cleat, and the distance from the cleat to the center of the blast hole are discussed. The results show that the greater the distance from the cleat to the center of the blast hole or the greater the aperture of the cleat, the greater the hindrance of the cleat to the propagation of the cracks. With the increase of the dip angle of the cleat, the hindrance of the cleat to crack propagation first increases and then decreases. American Chemical Society 2021-06-24 /pmc/articles/PMC8264853/ /pubmed/34250345 http://dx.doi.org/10.1021/acsomega.1c01450 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Sun, Keming
Chen, Peng
Zhang, Shucui
Li, Kai
Zhang, Xingang
Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title_full Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title_fullStr Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title_full_unstemmed Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title_short Numerical Investigation of Fracturing of Coal with Cleats Caused by Supercritical CO(2) Explosion
title_sort numerical investigation of fracturing of coal with cleats caused by supercritical co(2) explosion
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8264853/
https://www.ncbi.nlm.nih.gov/pubmed/34250345
http://dx.doi.org/10.1021/acsomega.1c01450
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