A New Method to Predict Shock-Type Coal-Gas Outburst Disaster and Its Application

Table 1

Disturbance intensity index of shock-type coal and gas outburst by hard roof.

Serial number	Thickness, m	Compressive strength, MPa	Distance between hard rock and coal seam, m	Disturbance intensity index
1	≥30	≥60	<20	6
2	15~30	≥60	<20	5
3	<15	≥60	<20	4
4	≥30	≥60	20~40	5
5	15~30	≥60	20~40	4
6	<15	≥60	20~40	3
7	≥30	≥60	≥40	4
8	15~30	≥60	≥40	3
9	<15	≥60	≥40	2
10	≥30	35~60	<20	5
11	15~30	35~60	<20	4
12	<15	35~60	<20	3
13	≥30	35~60	20~40	4
14	15~30	35~60	20~40	3
15	<15	35~60	20~40	2
16	≥30	35~60	≥40	3
17	15~30	35~60	≥40	2
18	<15	35~60	≥40	1