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Title: Size effect on acoustic emission characteristics of coal-rock damage evolution
Authors: Wen, Z
Wang, X
Chen, L
Lin, G
Zhang, H
Issue Date: 2017
Publisher: Hindawi Publishing Corporation
Source: Advances in materials science and engineering, 2017, v. 2017, 3472485 How to cite?
Journal: Advances in materials science and engineering 
Abstract: Coal-gas outburst, rock burst, and other mine dynamic disasters are closely related to the instability and failure of coal-rock. Coal-rock is the assemblies of mineral particles of varying sizes and shapes bonded together by cementing materials. The damage and rupture process of coal-rock is accompanied by acoustic emission (AE), which can be used as an effective means to monitor and predict the instability of coal-rock body. In this manuscript, considering the size effect of coal-rock, the influence of different height to diameter ratio on the acoustic emission characteristics of coal-rock damage evolution was discussed by microparticle flow PFC2D software platform. The results show that coal-rock size influences the uniaxial compressive strength, peak strain, and elastic modulus of itself; the size effect has little effect on the acoustic emission law of coal-rock damage and the effects of the size of coal-rock samples on acoustic emission characteristics are mainly reflected in three aspects: the triggering time of acoustic emission, the strain range of strong acoustic emission, and the intensity of acoustic emission; the damage evolution of coal-rock specimen can be divided into 4 stages: initial damage, stable development, accelerated development, and damage.
ISSN: 1687-8434
EISSN: 1687-8442
DOI: 10.1155/2017/3472485
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