Table 3 Analogous materials to model rock strata in the physical modelling experiment.

From: Simulation analysis of pressure relief effect of upward mining in the lower protective layer (group) of deep extra-thick coal seam

Serial number

Lithology

Model thicknes

/cm

Mixing

ratio

Capacityg

/cm3

Sand

/kg

Calcium Carbonate

/kg

Gypsum

/kg

Gross

weight/kg

Water

/kg

Number of layers

1

Coarse

sandstone

3

7:7:3

1.6

23.52

2.35

1.01

26.88

2.69

1

2

Medium sandstone

2

7:7:3

1.6

15.68

1.57

0.67

17.92

1.79

1

3

Mudstone

2

8:6:4

1.5

14.93

1.12

0.75

16.80

1.68

1

4

Siltstone

10

7:5:5

1.6

78.40

5.60

5.60

89.60

8.96

5

5

4-2 Coal

1.5

8:6:4

1

7.47

0.555

0.375

8.40

0.84

1

6

Medium sandstone

10

7:7:3

1.6

78.4

7.85

3.35

89.5

8.95

5

7

4-1 Coal

2.8

8:6:4

1

13.944

1.036

0.7

15.68

1.568

1

8

Medium sandstone

6

7:7:3

1.6

47.04

4.71

2.01

53.76

5.37

3

9

Fine

sandstone

6

7:8:2

1.6

47.04

5.38

1.34

53.76

5.24

3

10

Siltstone

6

7:5:5

1.6

47.04

3.36

3.36

53.76

5.38

2

11

Mudstone

2

8:6:4

1.5

14.93

1.12

0.75

16.80

1.68

1

12

3-1 Coal

3

8:6:4

1

14.94

1.11

0.75

16.80

1.68

1

13

Mudstone

6

8:6:4

1.5

44.79

3.36

2.25

50.4

1.68

3

14

Coarse

sandstone

3

7:7:3

1.6

23.52

2.35

1.01

26.88

2.69

1

15

Medium sandstone

2

7:7:3

1.6

15.68

1.57

0.67

17.92

1.79

1

16

Coarse

sandstone

3

7:7:3

1.6

23.52

2.35

1.01

26.88

2.69

1

17

Mudstone

4

8:6:4

1.5

29.87

2.24

1.49

33.60

3.36

2

18

Medium sandstone

3

7:7:3

1.6

23.52

2.35

1.01

26.88

2.69

1

19

Coarse

sandstone

3

7:7:3

1.6

23.52

2.35

1.01

26.88

2.69

1

20

Medium sandstone

4

7:7:3

1.6

31.36

3.14

1.34

35.84

3.58

2

21

Siltstone

6

7:5:5

1.6

47.04

3.36

3.36

53.76

5.38

2

22

Mudstone

4

8:6:4

1.5

29.87

2.24

1.49

33.60

3.36

2

23

Medium sandstone

2

7:7:3

1.6

15.68

1.57

0.67

17.92

1.79

1

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