Table 2 Physical and mechanical parameters of overburden rock.

From: Research on surface subsidence laws and prediction models under repeated mining of multiple coal seams

Lithology

Bed Thickness/m

Bulk density/d(kg/m3)

Bulk modulus/B(Gpa)

Shear modulus/S(Gpa)

Cohesion/c(Mpa)

Angle of friction/φ(°)

Tensile strength/σT(Mpa)

Eolian sand

11

2160

1.12

1.73

1.2

32

4.2

Medium-grained sandstone

8.85

2710

1.59

0.96

3.5

32.2

4.65

Coarse-grained sandstone

9.62

2690

2

1.5

5

35

6

sandy mudstone

11.33

2160

1.12

1.73

1.2

32

4.22

Fine-grained sandstone

11.45

2730

3.6

3.56

3.6

42

4.6

Coarse-grained sandstone

19.2

2690

1.5

1

5

35

6

Sandy Mudstone

7.78

2160

1.12

1.33

1.1

32

3.22

Fine-grained sandstone

7.68

2730

3.6

3.56

3.6

42

4.6

Medium Grain Sandstone

5.81

2710

1.59

0.96

3.5

32.2

4.65

Coarse Sandstone

3.78

2500

4.5

3.5

7.5

35

8.5

9# Coal

4.5

1300

0.44

0.25

0.25

33.9

2.77

Fine-grained sandstone

2

2730

3.6

3.56

3.6

42

4.6

Sandy Mudstone

7.68

2160

1.02

1.53

1

32

2

Fine-grained sandstone

13.64

2730

3.6

3.56

3.6

42

4.6

Sandy Mudstone

11.31

2160

1.22

1.83

1

32

2.1

Fine-grained sandstone

5.42

2730

4.06

4.06

4.06

42

5.4

Sandy Mudstone

4.95

2160

1.62

2.03

1.2

32

2.6

12# Coal

1

1300

0.46

0.35

0.027

33

0.24

Sandy Mudstone

9.03

2160

2.12

2.73

1.2

32

1.58

Fine-grained sandstone

2.99

2730

4.56

4.46

2.91

42

5.94

Sandy Mudstone

5.09

2160

2.12

2.73

1.2

32

1.58

Mudstone

4.3

2700

1.63

1.54

1.2

33

3.1

Sandy Mudstone

5.09

2160

2.12

2.73

1.2

32

1.58

16# Coal

8.5

1300

0.48

0.39

0.047

35

0.25

Fine-grained sandstone

2

2730

4.8

4.8

3

42

6

Sandy Mudstone

10

2160

2.12

2.73

1.2

32

1.58

Back to article page