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

Figure 14

Variation of stress, acoustic emission energy, and charge pulse 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 pulse by the pink line, and the AE energy by the blue scatter.

(a)

(b)

(c)