Position

Lithology

E

(Gpa)

μ

ρ

(kg/m³)

C

(MPa)

φ

(˚)

Roof

Sandstone

15.5

0.26

2450

3.6

25

Sidewalls

Coal

7.4

0.23

2210

2.5

20

Floor

Mudstone

5.3

0.21

2420

2.2

20

Smash zone

Coal

0.8

0.25

2210

1.5

16

Fractured zone

Coal

1.48

0.24

2210

1.9

18

Stemming

Clay

0.7

0.28

2130

1.2

15