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 1
The outburst danger of simulated coal seams under IGFB.
Sequence number
Coal sample
Gas type
Pressure (MPa)
IGFB (L)
IGEER (mJ/g)
Outburst type
Statistic
1
Xuehu coal mine, Henan, China
N2
0.208
8.39
12.32
A
2.032
2
N2
0.606
26.06
35.89
A
2.9648
3
CO2
0.219
35.28
41.5
A
3.2798
4
Fenghui coal mine, Shanxi, China
N2
0.21
15.34
18.7
A
2.4847
5
Wangchao coal mine, Shandong, China
N2
0.594
13.47
16.48
A
2.3793
6
N2
0.719
17.28
19.95
A
2.5853
7
CO2
0.188
33.48
23.09
A
3.223
8
N2
0.85
18.17
23.59
A
2.629
9
N2
0.978
22.11
27.14
A
2.8067
10
N2
1.186
32.26
32.91
A
3.1834
11
Wuzhong coal mine, Hebei, China
N2
0.170
9.00
9.08
A
2.0801
12
N2
0.331
13.32
17.69
A
2.3705
13
N2
0.473
20.61
25.27
A
2.7417
14
CO2
0.192
42.46
26.12
A
3.4887
15
N2
0.778
31.14
41.57
A
3.1461
16
Yiluo coal mine, Henan, China
N2
0.392
14.99
12.87
A
2.4657
17
CO2
0.182
33.34
21.71
A
3.2185
18
N2
0.759
20.44
24.92
A
2.7342
19
N2
1.072
32.02
35.19
A
3.1755
20
N2
1.225
33.59
40.22
A
3.2265
1
Xuehu coal mine, Henan, China
N2
0.951
42.57
56.32
B
3.4917
2
CO2
0.394
71.22
74.66
B
4.1451
3
N2
1.436
98.18
85.04
B
4.6133
4
Fenghui coal mine, Shanxi, China
N2
0.534
28.7
47.55
B
3.0617
5
Fenghui coal mine, Shanxi, China
CO2
0.198
38.26
66.76
B
3.3696
6
N2
0.797
52.31
70.96
B
3.7399
7
N2
1.160
61.05
103.29
B
3.9376
8
Wangchao coal mine, Shandong, China
CO2
0.409
51.4
50.24
B
3.7181
9
CO2
0.596
70.98
73.21
B
4.1404
10
CO2
0.766
77.56
94.09
B
4.2646
11
Wuzhong coal mine, Hebei, China
CO2
0.320
53.3
43.54
B
3.7634
12
N2
1.076
56.97
57.49
B
3.8478
13
N2
1.473
72.37
78.7
B
4.1673
14
CO2
0.605
103.33
82.31
B
4.6925
15
Yiluo coal mine, Henan, China
CO2
0.369
39.17
44.01
B
3.3961
16
N2
1.468
50.63
48.19
B
3.6994
17
CO2
0.591
52.98
70.49
B
3.7558
18
CO2
0.766
72.9
91.36
B
4.1774
1
Xuehu coal mine, Henan, China
CO2
0.612
92.59
115.97
C
4.524
2
CO2
0.846
119.44
160.32
C
4.9247
3
CO2
1.019
143.02
193.1
C
5.2296
4
Fenghui coal mine, Shanxi, China
CO2
0.407
115.45
137.22
C
4.8693
5
N2
1.674
117.24
149.05
C
4.8943
6
CO2
0.622
170.38
209.71
C
5.5438
7
CO2
0.796
270.69
268.38
C
6.4688
8
Wangchao coal mine, Shandong, China
CO2
1.033
115.22
126.88
C
4.866
9
Wuzhong coal mine, Hebei, China
CO2
0.765
152.6
104.08
C
5.3438
10
Yiluo coal mine, Henan, China
CO2
0.919
86.94
109.61
C
4.43
A: nonoutburst; B: weak outburst; C: strong outburst; resorted according to types A, B, and C.
