Size Effect on Acoustic Emission Characteristics of Coal-Rock Damage Evolution

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Wen, Zhijie ; Wang, Xiao ; Chen, Lianjun ; Lin, Guan ; Zhang, Hualei (2017)
  • Publisher: Hindawi Publishing Corporation
  • Journal: Advances in Materials Science and Engineering (issn: 1687-8434, eissn: 1687-8442)
  • Related identifiers: doi: 10.1155/2017/3472485
  • Subject: TA401-492 | Materials of engineering and construction. Mechanics of materials | Article Subject
    mesheuropmc: respiratory system | complex mixtures | respiratory tract diseases | otorhinolaryngologic diseases | technology, industry, and agriculture

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.
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