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

Figure 20

Test result of AE and charge induction signal for coal specimen under uniaxial compression at a different stages. (a) Before peak; (b) peak point; (c) after peak. Stress is denoted by the black curve, AE energy by the orange scatter, and charge pulse by the thin green line.

(a)

(b)

(c)