Table 6 Experimental results of response surface analysis.

From: Multifactor analysis and dominant factor identification for coal seam gas drainage borehole instability

Number

A

B

C

D

Peak stress

Number

A

B

C

D

Peak stress

1

6

1.0

40

PE

46.5

16

9

2.2

55

PE

53.2

2

6

2.2

40

PE

35.1

17

6

1.6

25

PE

47.4

3

12

1.0

40

PE

80.1

18

6

1.6

55

PE

36.3

4

12

2.2

40

PE

67.2

19

12

1.6

25

PE

78.1

5

9

1.6

25

None

62.4

20

12

1.6

55

PE

69.7

6

9

1.6

25

PP

74.2

21

9

1.0

40

None

65.3

7

9

1.6

55

None

53.5

22

9

1.0

40

PP

72.2

8

9

1.6

55

PP

40.6

23

9

2.2

40

None

43.4

9

6

1.6

40

None

35.6

24

9

2.2

40

PP

58.6

10

6

1.6

40

PP

43.6

25

9

1.6

40

PE

67.5

11

12

1.6

40

None

70.2

26

9

1.6

40

PE

68.2

12

12

1.6

40

PP

74.8

27

9

1.6

40

PE

69.7

13

9

1.0

25

PE

71.1

28

9

1.6

40

PE

68.5

14

9

1.0

55

PE

65.9

29

9

1.6

40

PE

67.2

15

9

2.2

25

PE

63.3

Ā Ā Ā Ā Ā Ā