Table 1 Physical and mechanical parameters of rocks.

From: Mechanism and control technology of roadway floor heave deformation and failure under the influence of repeated mining in multiple coal seams

Rock type

Density g/cm3

Bulk modulus/GPa

Shear modulus/GPa

Internal friction angle/(°)

Cohesion/MPa

Compressive strength/MPa

Mudstone

2.59

0.82

0.47

42

2.0

3.05

Sandy mudstone

1.82

1.60

0.49

42

1.30

0.18

#2 coal

1.30

1.00

0.50

36

1.80

0.80

Medium sandstone

1.69

3.68

1.05

37

4.78

1.50

Fine sandstone

2.60

6.00

4.00

15

2.00

1.50

#3 coal

1.36

1.01

0.58

40

1.82

0.77

Siltstone

1.76

7.00

6.00

30

3.230

0.38

#4 coal

1.36

1.01

0.58

40

1.82

0.77

#5 coal

1.36

1.01

0.58

40

1.82

0.77

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