Journal
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
Volume 2017, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2017/3472485
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Funding
- National Natural Science Foundation of China [51304126, 51304235]
- Fok Ying Tung Education Foundation [141046]
- China Postdoctoral Science Foundation [2013M541918]
- Shan Dong University of Science and Technology Outstanding Young Investigator Award [2014JQJH105]
- Project of Shandong Province Higher Educational Science and Technology Program [J15LH04]
- State Key Laboratory of Open Funds [SKLGDUEK1520]
- Tai'shan Scholar Engineering Construction Fund of Shandong Province of China
- Tai'shan Scholar Talent Team Support Plan for Advanced & Unique Discipline Areas
- State Key Research Development Program of China [2016YFC0600708-3]
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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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