Table 1 Physical and mechanical parameters of coal seam and rock stratum.

From: The evolution law of deviatoric stress and asymmetric control technology in roadways during panel mining through overlying residual coal pillars

Coal and rock stratum

Density/(kg m−3)

K/GPa

G/GPa

c/MPa

σt/MPa

φ/°

Sandy mudstone

2631

5.16

4.23

1.98

1.63

30

Siltstone

2745

9.11

7.14

2.97

1.97

26

Fine-sandstone

2767

9.83

7.27

3.02

3.01

29

Coal seam

1344

2.33

1.63

0.91

0.37

23

Mudstone

2287

4.81

2.54

1.62

1.28

22

Medium grained sandstone

2690

9.43

6.23

4.37

3.46

29

  1. Where K is bulk modulus, G is shear modulus, c is cohesion, σt is tensile strength, φ is internal friction angle.
Back to article page