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

Table 2

Classification criteria of coal’s bursting liability.

Classification indexes of bursting liability	DT (ms)	WET	KE	RC (MPa)
Schematic diagram
Strong bursting liability	DT ≤ 50	WET ≥ 5	KE ≥ 5	RC ≥ 14
Weak bursting liability	50 < DT ≤ 500	2 ≤ WET < 5	1.5 ≤ KE < 5	7 ≤ RC < 14
No bursting liability	DT > 500	WET < 2	KE < 1.5	RC < 7