The Properties of a Coal Body and Prediction of Compound Coal-Rock Dynamic Disasters

Table 3

Gas parameters of coal found by laboratory investigation.

Sampling site	Initial gas emission velocity ΔP	Firmness coefficient of soft coal f	K1-P relational model, K1 = AP^B
			A	B	0.50 MPa	0.60 MPa	0.74 MPa	1.10 MPa
2607-50 heading face	6	0.27	0.1472	0.5582	K1 = 0.10	K1 = 0.11	K1 = 0.12	K1 = 0.16
2607-50 heading face	5	0.26	0.1902	0.7115	K1 = 0.12	K1 = 0.14	K1 = 0.15	K1 = 0.20
2609-90 heading face	8	0.29	0.2196	0.6989	K1 = 0.14	K1 = 0.15	K1 = 0.18	K1 = 0.23