Acoustic Emission and Fractal Precursory Characteristics of Coals with Different Bursting Liabilities in Loading Failure Process

Figure 2

Schematic diagram of experimental system. (1) Compression testing machine; (2) insulating gasket; (3) coal sample; (4) AE sensor; (5) shielding system; (6) preamplifier; (7) AE data acquisition system; (8) loading control system; (9) shielding room.