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

Table 2

Design of test plan.

Confining pressure(MPa)	Dynamic load frequency (Hz)	Amplitude (kN)	Loading rate of confining pressure (MPa/s)	Axial loading rate		The number of specimens
				MPa/s	mm/s
12	0	0	10^–2	10^–2	10^–3	3
	3	10				5
	4					5
	5					5
	6					5