Mathematical Problems in Engineering / 2017 / Article / Tab 1

Research Article

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 numberCoal sampleGas typePressure (MPa)IGFB (L)IGEER (mJ/g)Outburst typeStatistic

1Xuehu coal mine, Henan, ChinaN20.2088.3912.32A2.032
2N20.60626.0635.89A2.9648
3CO20.21935.2841.5A3.2798

4Fenghui coal mine, Shanxi, ChinaN20.2115.3418.7A2.4847

5Wangchao coal mine, Shandong, ChinaN20.59413.4716.48A2.3793
6N20.71917.2819.95A2.5853
7CO20.18833.4823.09A3.223
8N20.8518.1723.59A2.629
9N20.97822.1127.14A2.8067
10N21.18632.2632.91A3.1834

11Wuzhong coal mine, Hebei, ChinaN20.1709.009.08A2.0801
12N20.33113.3217.69A2.3705
13N20.47320.6125.27A2.7417
14CO20.19242.4626.12A3.4887
15N20.77831.1441.57A3.1461

16Yiluo coal mine, Henan, ChinaN20.39214.9912.87A2.4657
17CO20.18233.3421.71A3.2185
18N20.75920.4424.92A2.7342
19N21.07232.0235.19A3.1755
20N21.22533.5940.22A3.2265

1Xuehu coal mine, Henan, ChinaN20.95142.5756.32B3.4917
2CO20.39471.2274.66B4.1451
3N21.43698.1885.04B4.6133

4Fenghui coal mine, Shanxi, ChinaN20.53428.747.55B3.0617

5Fenghui coal mine, Shanxi, ChinaCO20.19838.2666.76B3.3696
6N20.79752.3170.96B3.7399
7N21.16061.05103.29B3.9376

8Wangchao coal mine, Shandong, ChinaCO20.40951.450.24B3.7181
9CO20.59670.9873.21B4.1404
10CO20.76677.5694.09B4.2646

11Wuzhong coal mine, Hebei, ChinaCO20.32053.343.54B3.7634
12N21.07656.9757.49B3.8478
13N21.47372.3778.7B4.1673
14CO20.605103.3382.31B4.6925

15Yiluo coal mine, Henan, ChinaCO20.36939.1744.01B3.3961
16N21.46850.6348.19B3.6994
17CO20.59152.9870.49B3.7558
18CO20.76672.991.36B4.1774

1Xuehu coal mine, Henan, ChinaCO20.61292.59115.97C4.524
2CO20.846119.44160.32C4.9247
3CO21.019143.02193.1C5.2296

4Fenghui coal mine, Shanxi, ChinaCO20.407115.45137.22C4.8693
5N21.674117.24149.05C4.8943
6CO20.622170.38209.71C5.5438
7CO20.796270.69268.38C6.4688

8Wangchao coal mine, Shandong, ChinaCO21.033115.22126.88C4.866

9Wuzhong coal mine, Hebei, ChinaCO20.765152.6104.08C5.3438

10Yiluo coal mine, Henan, ChinaCO20.91986.94109.61C4.43

A: nonoutburst; B: weak outburst; C: strong outburst; resorted according to types A, B, and C.