Experimental study on deformation and acoustic emission characteristics of coal samples under cyclic loading

doi:10.16265/j.cnki.issn1003-3033.2017.11.019

Abstract

Abstract: The effect of the axial stress level on fracture evolution during the fatigue failure process of coal samples was studied using a test system consisting of a rock mechanics testing machine and a acoustic emission instrument. The results show that under cyclic loading, the deformation process of coal samples has a deceleration phase, an uniform phase and an acceleration phase, that there is a change of sparse-dense-sparse in the hysteresiscurves, that both the density of the hysteresis loop and the fatigue life are proportional to the stress level, that acoustic emission is characterized byobvious stages, that the higher the stress level is, the more intense the acoustic emission activity in each stage will be, that the fracture evolution process of coal sample is includes an initial damage stage, a stable stage of development of micro cracks and a crack failure stage, and that there is a positive correlation between both the crack initiation and propagation in a single cycle and the stress level.

Key words: coal, cyclic loading, fracture evolution, acoustic emission characteristics, stress-strain characteristics

CLC Number:

X936

GUO Junjie, CHENG Xiaoyang. Experimental study on deformation and acoustic emission characteristics of coal samples under cyclic loading[J]. China Safety Science Journal, 2017, 27(11): 109-115.

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