A New Method for Predicting Coal and Gas Outbursts

Table 8

Initial critical value of gas desorption index K₁ of drilling cuttings.

Coal samples	Sampling site	Initial critical value of gas desorption index K1 of drilling cuttings (mL/g.min^1/2)	K1– relationship K1 = AP^B
			A	B
1	Return air roadway in the 121901 working face	0.62	0.7222	0.4948
2	Transportation roadway in the 121901 working face	0.69	0.8038	0.5122
3	2# connection roadway in the 121901 working face	0.67	0.7729	0.4961