A Risk Assessment Method for Rockburst Based on Geodynamic Environment

Table 2

Statistics data of rockbursts coal mines with different λ value.

Depth /m	λ<1		1.0≤λ<1.3		1.3≤λ<2.0		λ≥2.0
	The number of mines	The number of rockburst mines	The number of mines	The number of rockburst mines	The number of mines	The number of rockburst mines	The number of mines	The number of rockburst mines
0~200	0	0	4	0	4	0	2	0
200~300	2	0	4	0	9	2	1	1
300~400	1	0	5	0	9	4	0	0
400~500	1	1	7	0	6	3	4	4
500~600	4	1	5	0	6	6	3	3
600~700	2	2	3	2	5	3	2	2
700~800	0	0	4	1	6	6	5	5
800~900	1	1	2	0	10	10	0	0
900~1000	0	0	1	1	3	1	0	0
≥1000	1	1	7	6	1	1	0	0