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Open AccessArticle

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

1
School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, China
2
School of Civil Engineering, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(8), 1040; https://doi.org/10.3390/sym11081040
Received: 14 July 2019 / Revised: 29 July 2019 / Accepted: 7 August 2019 / Published: 13 August 2019
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Abstract

In this manuscript, the numerical coal-rock combined bodies with different height ratios of rock part to coal-rock combined body (HRRC) were established by particle flow code (PFC) firstly, and then the influence of different HRRC on mechanical properties and numerical acoustic emission (AE) characteristics of coal-rock combined bodies were investigated. Finally, the damage constitutive model of the coal-rock combined body was discussed. The research results show that with the increase of the HRRC, the UCS and the elastic modulus (E) of the combined coal-rock bodies increased. The failure of coal-rock combined bodies is mainly focused on the coal body. The evolution law of AE hits of coal-rock combined bodies have three stages, named stable stage, rapid ascending stage, and rapid descending stage. The damage variable curves of coal-rock combined body have two stages, named slowly damage stage and sharply damage stage. The damage constitutive relation based on AE hits can well reflect the stress-strain relationships with a lower HRRC. However, for a higher HRRC, the damage constitutive equation is not accurately and the damage of the rock part in the coal-rock-combined body should be considered. View Full-Text
Keywords: coal-rock combined body; particle flow code; mechanical properties; acoustic emission; damage constitutive model coal-rock combined body; particle flow code; mechanical properties; acoustic emission; damage constitutive model
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Liu, W.; Yuan, W.; Yan, Y.; Wang, X. Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code. Symmetry 2019, 11, 1040.

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{"cc_re__cc_re__cc_by_3_0": ["d on Particle Flow Code\">\n<meta name=\"dc.creator\" content=\"Wanrong Liu\">\n<meta name=\"dc.creator\" content=\"Wei Yuan\">\n<meta name=\"dc.creator\" content=\"Yatao Yan\">\n<meta name=\"dc.creator\" content=\"Xiao Wang\">\n<meta name=\"dc.type\" content=\"Article\">\n<meta name=\"dc.source\" content=\"Symmetry 2019, Vol. 11, Page 1040\">\n<meta name=\"dc.date\" content=\"2019-08-13\">\n<meta name=\"dc.identifier\" content=\"10.3390/sym11081040\">\n<meta name=\"dc.publisher\" content=\"Multidisciplinary Digital Publishing Institute\">\n<meta name=\"dc.rights\" content=\"http://creativecommons.org/licenses/by/3.0/\">\n<meta name=\"dc.format\" content=\"application/pdf\">\n<meta name=\"dc.language\" content=\"en\">\n<meta name=\"dc.description\" content=\"In this manuscript, the numerical coal-rock combined bodies with different height ratios of rock part to coal-rock combined body (HRRC) were established by particle flow code (PFC) firstly, and then the influence of different HRRC on mechanical properties and numerical acoustic emission (AE) characteristics of coal-rock combined bodies were investigated. Finally, the dam"], "cc_re__cc_re__cc_by_4_0": ["ith different HRRC. (&lt;bold&gt;a&lt;/bold&gt;) HRRC = 0.0; (&lt;bold&gt;b&lt;/bold&gt;) HRRC = 0.2; (&lt;bold&gt;c&lt;/bold&gt;) HRRC = 0.4; (&lt;bold&gt;d&lt;/bold&gt;) HRRC = 0.5; (&lt;bold&gt;e&lt;/bold&gt;) HRRC = 0.6; (&lt;bold&gt;f&lt;/bold&gt;) HRRC = 0.8; (&lt;bold&gt;g&lt;/bold&gt;) HRRC = 1.0.&lt;/p&gt;\n                                                            \"></a></div>\n<div class=\"licenseText in-tab\" style=\"padding: 1em 0;\">\nThis is an open access article distributed under the <a href=\"https://creativecommons.org/licenses/by/4.0/\" target=\"_blank\" rel=\"noopener noreferrer\">Creative Commons Attribution License</a> which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).\n</div>\n</div>\n<div id=\"tabs-3\" class=\"ui-tabs-panel\">\n<a class=\"show-for-medium-up\" style=\"margin-bottom: 15px;\" href=\"/2073-8994/11/8/1040/scifeed_display\" data-reveal-id=\"scifeed-modal\" data-reveal-ajax=\"true\">\n<img width=\"100%\" src=\"https://www.mdpi.com/bundles/mdpimain/img/scifeed_large.png\" id=\"feed_option\" alt=\"SciF"], "copyright__copyright__copyright": ["cs and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code. Symmetry 2019, 11, 1040.\n\nShow more citation formats Show less citations formats\n\nNote that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.\n\nRelated Articles\n\nArticle Metrics\n\nArticle Access Statistics\n\n1\n\nComments\n\n[Return to top]\nSymmetry EISSN 2073-8994 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert\nBack to Top", "cs and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code. Symmetry 2019, 11, 1040.\n\nShow more citation formats Show less citations formats\n\nNote that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.\n\nRelated Articles\n\nArticle Metrics\n\nArticle Access Statistics\n\n1\n\nComments\n\n[Return to top]\nSymmetry EISSN 2073-8994 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert\nBack to Top", "cs and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code. Symmetry 2019, 11, 1040.\n\nShow more citation formats Show less citations formats\n\nNote that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.\n\nRelated Articles\n\nArticle Metrics\n\nArticle Access Statistics\n\n1\n\nComments\n\n[Return to top]\nSymmetry EISSN 2073-8994 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert\nBack to Top"]}