The Mechanism and Application of Deep-Hole Precracking Blasting on Rockburst Prevention

Table 3

Bursting proneness testing results of coal and coal-rock mass combination.

Sample number	/ms			/MPa	Bursting proneness degree
A-1	316	1.44	3.10	10.08	Weak
A-2	358	1.55	2.37	13.64
A-3	379	1.93	2.41	15.21
Average	351	1.64	2.63	12.98
B-1	218	2.06	5.49	15.89	Weak
B-2	132	3.82	2.74	16.98
B-3	150	2.57	3.52	15.96
Average	166	2.82	3.92	16.28
C-1	16	7.83	6.62	17.26	Strong
C-2	8	10.83	4.50	21.23
C-3	13	9.68	5.87	19.12
Average	12.3	9.44	5.53	19.20