Study on Characteristics of Acoustic Emission b Value of Coal Rock with Outburst-Proneness under Coupled Static and Dynamic Loads

Figure 9

AE b value evolution characteristics of coal rock under coupled static and dynamic loads: (a) 3 Hz, (b) 4 Hz, (c) 5 Hz, and (d) 6 Hz.

(a)

(b)

(c)

(d)