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Size effect of acoustic emission characteristics of damage evolution of coal and rock

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Document pages: 8 pages

Abstract: Coal and gas outburst, rock burst and other mine dynamic disasters are closely related to coal and rock instability and failure. Coal rock is an aggregate of mineral particles of different sizes and shapes combined by cementitious materials. The damage and fracture process of coal and rock mass is accompanied by acoustic emission, which is an effective means to monitor and predict the instability of coal and rock mass. Using the particle flow software platform and considering the size effect of coal and rock, this paper discusses the influence of different height diameter ratio on the acoustic emission characteristics of coal and rock damage evolution. The results show that the size of coal and rock affects the uniaxial compressive strength, peak strain and elastic modulus of coal and rock; th 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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