Mechanical Properties of Bump-Prone Coal with Different Porosities and Its Acoustic Emission-Charge Induction Characteristics under Uniaxial Compression

Figure 15

Variation of stress, accumulation of acoustic emission energy, and charge with time. (a) Specimen 25^# with high strength; (b) specimen 9^# with moderate strength; (c) specimen 3^# with low strength. Stress is denoted by the black curve, the charge accumulation by the pink curve, and the AE energy accumulation by the blue curve.

(a)

(b)

(c)