Study on Prediction of Outburst Risk of Excavation Face by Initial Gas Emission

Table 2

Experimental results.

Experimental dataset	Maximum drilling cutting bit index (kg·m^-1)	Maximum gas emission initial velocity index (L·min^-1)	Maximum flow peak area index (L·m^2·min^-1)	With and without coal and gas outburst	Drill became stuck
1	4.5	3.2	142.94	Without	Yes
2	2.6	2.2	13.96	Without	No
3	2.5	2.0	27.87	Without	No
4	2.3	1.7	22.65	Without	No
5	2.4	2.1	94.84	Without	No
6	1.8	3.1	16.68	Without	No
7	2.2	1.7	30.46	Without	No
8	1.8	1.9	9.71	Without	No
9	2.0	2.1	12.15	Without	No
10	1.5	1.2	3.85	Without	No
11	2.2	1.8	20.17	Without	No