Experimental Analyses of the Major Parameters Affecting the Intensity of Outbursts of Coal and Gas

Table 3

Coupled factors and relative intensity of outburst in coal and gas.

Factors					Results of experiments
Test number	Moisture (%)	Geostress (MPa)	Porosity (%)	Gas pressure (MPa)	Relative intensity (%)
1	0	3.4	3.1	3	39.2
2	3.6	1.9	3.3	1.34	10.9
3	2.6	1.8	2.3	1.5	24.1
4	2.4	2	3.6	1.9	16.5
5	3.6	1.3	2.4	3.1	17.2
6	2.8	3.3	0.5	1.5	23.57
7	3.4	3.4	1.7	1.8	19.2
8	2.6	4	3.3	2.1	24.5
9	4	4	3.1	2.2	23.8
10	4.8	3	2.8	1.6	19.23
11	3.6	4	3.3	2.4	22.9
12	8	3.8	2.2	0.6	0
13	2.8	4	3.6	3.6	26
14	7.2	1	3.6	1.2	5.87
15	7.2	2.1	1.4	3.2	18.5
16	0	0.6	0.6	0	0

Remarks: moisture: level 1 (0–2.7), level 2 (2.7–5.4), and level 3 (5.4–8); Geostress: level 1 (0–1.33), level 2 (1.33–2.66), and level 3 (2.66–4); Porosity: level 1 (0–1.2), (1.2–2.4), level 3 (2.4–3.6); gas pressure: level 1 (0–1.33), level 2 (1.33–2.67), and level 3 (2.67–4).