Table 1 Ratio of similar materials.

From: Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

No

Lithology

Proportion number

Slice Thickness/cm

Total Thickness/cm

Gypsum/kg

Calcium carbonate/kg

Pulverized Coal/kg

Water/kg

12

Fine sandstone

837

3.1

126

0.9

2.2

 

2.77

11

Siltstone

728

12.2

122.9

2.8

10.8

 

11

10

Siltstone

728

1.5

110.7

0.3

1.4

 

1.39

9

Siltstone

728

6.9

109.2

1.5

6.3

 

6.21

8

Coarse Grained Sandstone

973

17.1

102.3

10.5

4.9

 

15.4

7

No.11 coal

 

5.1

85.2

1

5

19.8

4.6

6

Fine Grained Sandstone

837

25.8

80.1

8.1

18

 

23.4

5

Siltstone

728

7.2

54.3

1.5

6.3

 

6.3

4

No.12 coal

 

19.9

47.1

3.9

19.5

78

18

3

Siltstone

728

6.6

27.2

1.5

6

 

6

2

Fine Grained Sandstone

837

5.2

20.6

1.6

3.7

 

4.7

1

Siltstone

728

15.4

15.4

3.6

13.8

 

13.8