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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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