Table 1 Physical–mechanical parameters of the roof rocks for the 112201 working face.

From: Elastic wave prospecting of water-conducting fractured zones in coal mining

Layer no

Thickness (m)

Rock type

Natural density (KN/m3)

Tensile strength (MPa)

Elastic modulus (GPa)

Cohesion (MPa)

Internal friction angle (°)

1

6.8

Fine sand

1.45

0.1

0.1

  

2

83.2

Red clay

1.55

0.1

0.1

0.03

25.8

3

11.77

Siltstone

23.6

1.02

19.58

2.44

38.75

4

5.43

Fine-grained sandstone

23.2

1.26

25.47

2.88

38.84

5–6

21.2

Siltstone

23.2

1.1

21.24

2.34

38.69

7

9.7

Fine-grained sandstone

22.9

1.25

36.8

3.82

36.97

8

5.98

Sandy mudstone

23.7

1.62

30.27

3.19

37.87

9

13.21

Siltstone

24.1

1.25

23.25

2.44

38.75

10

8.5

Fine-grained sandstone

22.9

1.96

36.58

3.82

36.97

11

3.6

Sandy mudstone

23.7

1.62

30.27

3.19

37.87

12

10.9

Fine-grained sandstone

22.9

1.96

36.58

3.82

36.97

13

25.95

Siltstone

23.5

1.32

24.32

2.67

37.93

14

30.85

Fine-grained sandstone

23.1

1.5

26.57

2.88

38.84

15

16.91

Siltstone

23.6

0.98

16.58

1.94

39.29

16

6.1

Sandy mudstone

23.7

1.62

30.27

3.19

37.87

17

8.89

Fine-grained sandstone

23.2

1.4

27.5

2.8

37.42

18

19.35

Medium-grained sandstone

22.8

1.75

32.45

3.49

38.35

19

9.05

Fine-grained sandstone

23.2

1.4

27.45

2.28

37.42

20

0.65

1-1 coal

13.2

0.56

8.58

0.92

35.96

21

3.25

Siltstone

23.5

1.34

24.68

2.27

37.42

22

0.55

Coal

13.2

0.56

10.12

0.92

35.96

23

1.2

Siltstone

23.9

1.2

21.47

3.53

38.16

24

13.5

Fine-grained sandstone

2.31

2.21

41.2

4.49

38.35

25

1.4

Fine-grained sandstone

22.1

1.85

31.27

3.59

37.11

26

10.71

Siltstone

23.9

1.23

26.5

2.14

39.85

27

35.29

Medium-grained sandstone

23.1

1.98

31.07

3.29

39.17

28

3.37

Fine-grained sandstone

23.3

1.65

29.87

3.12

37.35

29

5.78

2-2 coal

13.1

0.48

7.54

0.61

38.48

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