Table 4 Mechanical param of numerical model.

From: Study on the influence of overlying coal seam mining on the deformation of floor roadway surrounding rock

Lithology

Bulk Modulus

/GPa

Shear Modulus

/GPa

Density

/g·cm− 3

Cohesion

/MPa

Internal Friction Angle

/°

Tensile Strength

/MPa

Coal 8

0.09

0.08

1.38

1.25

32

0.25

Coal 9

0.09

0.08

1.38

1.25

32

0.25

Mudstone

1.19

1.26

2.38

2.00

30

1.50

Roadway

1.19

1.26

2.38

2.00

30

1.50

Aluminous Mudstone

1.29

1.36

2.48

2.10

31

1.60

Siltstone

2.58

1.59

2.46

2.80

33

2.30

Fine Sandstone

1.54

1.88

2.54

3.00

35

2.40

Coarse Sandstone

3.61

2.5

2.89

1.98

35

3.20

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