ACOUSTIC EMISSION AND DAMAGE CHARACTERISTICS OF ANTHRACITE UNDER DIFFERENT CONDITIONS

Acoustic emission (AE) can be used to observe the process of coal fracture propagation. Based on a press and acoustic-emission platform, damage characteristics anthracite with different loading rates, water amounts sizes were studied. The results show that there is less acoustic in initial compression stage coal; more active transition from elastic deformation plastic deformation, which manifested following aspects: faster rate, higher number events; peak count emissions saturated-coal sample significantly lower than natural-coal sample. Coal samples large emit even sounds. normalization counts, relationship between variables stress-strain studied, it characterized by an slow increase, followed rapid increase; however, factors have great influence damage-characteristic curve. research certain guiding significance for rock disaster prediction.