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Minerals 2018, 8(6), 244; https://doi.org/10.3390/min8060244

Particle-Crushing Characteristics and Acoustic-Emission Patterns of Crushing Gangue Backfilling Material under Cyclic Loading

1
State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
2
School of Mechanical and Mining Engineering, The University of Queensland, Queensland 4072, Australia
*
Author to whom correspondence should be addressed.
Received: 13 May 2018 / Revised: 31 May 2018 / Accepted: 3 June 2018 / Published: 7 June 2018
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Abstract

In solid backfilling coal mining (SBCM), the crushed gangue backfilling material (CGBM) is generally compacted circularly by a compaction machine in order to reduce its compressibility. In this cyclic compaction process, the particles are crushed, which has a significant effect on the deformation resistance of CGBM. However, the deformation resistance of CGBM is critical for controlling overburden strata movement and ground surface subsidence. This study implemented an experimental approach to investigate the particle-crushing characteristics and acoustic-emission (AE) characteristics of CGBM during constant-amplitude cyclic loading (CACL). At the same time, the relationship between particle crushing and AE signals was established. The results showed that the gangue particles were generally in the shape of irregular convex polyhedrons with more edges and angles that were prone to breakage. It also demonstrated that both the crushing ratio (Bg) and the newly produced fine granule content increased with the cyclic loading times. The content of newly generated fine particles can reflect the particle-crushing conditions to a certain extent. What is more, it was found that the CGBM samples exhibited an apparent Felicity effect during CACL, and AE signals were the most active during the first loading cycle. The crushing ratio of CGBM was highly correlated to the AE signals, which indicated that AE signals can be used to reflect the particle-crushing situation of CGBM. This study is of great significance for obtaining an in-depth understanding of the mechanical properties of CGBM, as well as providing guidance for the engineering practice of SBCM. View Full-Text
Keywords: crushing gangue backfilling material; cyclic loading; particle crushing; acoustic emission; solid backfilling coal mining crushing gangue backfilling material; cyclic loading; particle crushing; acoustic emission; solid backfilling coal mining
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, J.; Huang, Y.; Chen, Z.; Li, M.; Qiao, M.; Kizil, M. Particle-Crushing Characteristics and Acoustic-Emission Patterns of Crushing Gangue Backfilling Material under Cyclic Loading. Minerals 2018, 8, 244.

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