Table 3 Highlighting data sets and evaluation index systems27.

From: Coal and gas protrusion risk evaluation based on cloud model and improved combination of assignment

Number

U11

U12

U13

U14

U21

U22

U23

U24

U25

U31

U32

U33

U34

1

3

885

8.88

0.58

10.24

6.3

224

2.8

8

425

1

12.9

1.83

2

3

735

8.38

0.37

9.01

5.7

167

1.24

8

744

2

15.2

1.41

3

1

120

8.3

0.54

4.61

2.2

12

0.44

7

512

1

5.7

1.81

4

5

673

5.06

0.52

8.26

3.9

138

1.28

6

484

2

16.6

1.78

5

1

332

4.24

0.61

9.05

2.9

142

1.19

5

397

1

11.1

1.62

6

3

357

3.42

0.16

10.27

6.9

129

1.2

18

462

1

12.4

1.34

7

5

268

2.97

0.27

9.88

4.2

24

1.36

7

399

3

4.3

1.65

8

1

387

2.38

0.36

12.49

2.7

114

1.57

13

542

2

11.2

1.5

9

3

649

8.51

0.23

13.06

7.9

241

0.94

6

446

1

13.2

2.01

10

5

579

5.02

0.31

10.03

2.6

163

2.76

20

621

3

7.7

1.19

11

1

294

7.9

0.23

12.42

3.7

15

1.75

14

540

1

7.3

0.94

12

0

869

6.86

0.54

11.53

6.9

142

2.79

11

647

2

13.8

1.19

13

1

883

5.11

0.33

10.02

5.8

137

2.99

9

512

3

15.8

1.44

14

1

467

8

0.48

13.1

3.9

130

0.84

18

561

3

18.8

1.4

15

0

254

8.97

0.22

8.23

1.6

23

3.92

14

543

1

6.8

0.94

16

0

925

7.1

0.21

7.01

7.9

199

0.79

9

442

1

15.8

2.02

17

0

223

5.91

0.62

2.01

1.8

33

0.62

6

400

3

3.9

1.62

18

1

352

4.74

0.47

9.51

4.2

98

2

7

460

2

13.8

1.1

19

1

674

4.31

0.33

13.61

2

163

1.88

15

622

2

14.8

1.21

20

0

146

5.19

0.35

5.21

1

142

0.74

8

750

1

7.9

1.4

  1. U11 represents the type of damage, U12 represents the number of acoustic emission events, U13 represents the maximum amount of drilling debris, U14 represents the solidity coefficient, U21 represents gas content, U22 represents gas emission, U23 represents electromagnetic radiation intensity, U24 represents gas pressure, U25 represents the initial velocity of gas emission, U31 represents vertical depth, U32 represents geological structure, U33 represents ground stress, and U34 represents the thickness of soft layered coal body.