A Fisher’s Criterion-Based Linear Discriminant Analysis for Predicting the Critical Values of Coal and Gas Outbursts Using the Initial Gas Flow in a Borehole

Table 2

The results of the outburst simulation experiments and IGFB prediction.

Sequence number	Coal sample	Gas type	Gas pressure (MPa)	Outburst situation	Throw-out rate (%)	Results of outburst simulation	IGFB (L)	Predicted results of IGFB
1	Wangchao coal mine, Shandong, China	N2	0.279	Coal wall without damage	0	Nonoutburst	2.95	Nonoutburst
2	Wuzhong coal mine, Hebei, China	N2	0.326	Coal wall without damage	0	Nonoutburst	13.91	Nonoutburst
3	Fenghui coal mine, Shanxi, China	N2	0.326	Coal wall with slight damage	0	Nonoutburst	17.74	Nonoutburst
4	Wuzhong coal mine, Hebei, China	CO2	0.154	Coal wall without damage	0	Nonoutburst	27.74	Nonoutburst
5	Yiluo coal mine, Henan, China	CO2	0.216	The quality of thrown coal is 2.1 kg	2.25	Nonoutburst	30.98	Nonoutburst
6	Xuehu coal mine, Henan, China	CO2	0.216	The quality of thrown coal is 4.1 kg	5.13	Weak outburst	40.90	Weak outburst
7	Yiluo coal mine, Henan, China	CO2	0.387	The quality of thrown coal is 8.1 kg	8.66	Weak outburst	43.75	Weak outburst
8	Fenghui coal mine, Shanxi, China	CO2	0.346	The quality of thrown coal is 39.1 kg	40.54	Strong outburst	89.29	Strong outburst