Table 2 Geomechanical parameters of coal-bearing strata.

From: Influence of the inclination angles on the stress distribution in the bottom plate under the deep residual coal pillar

Stratum

Density

(kg/m3)

Elastic

modulus (GPa)

Poisson’s

ratio

Cohesion

(MPa)

Friction angle

(°)

Tensile strength

(MPa)

Mudstone

2461

8.75

0.26

1.2

30

0.605

Coarse-grained sandstone

2560

33.4

0.15

3.04

40

4.34

Coal seam

2580

14.58

0.32

1.25

32

0.15

Fine-grained sandstone

2540

33.4

0.235

3.2

42

1.29

Siltstone

2460

19.5

0.2

3.75

38

1.84

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