Table 2 Numerical model rock mechanics parameter table.

From: Study on fracture development and failure characteristics of repeated mining overlying strata in multi-coal seams with faults

Rock formation

Bulk modulus/GPa

Shear modulus/GPa

Tensile strength/MPa

Force of cohesion/MPa

Angle of internal friction/°

Muddy siltstone

7.25

6.35

1.81

2.66

38

Fine sandstone

10.6

9.1

2.53

2.2

32

Mudstone

6.38

5.14

2.91

6.42

34

Siltstone

5.01

3.82

2.5

6

35

Silty mudstone

5.12

4.73

1.01

2.54

32

Coal seam

2.08

0.54

0.64

1.2

20

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