Table 2 Parameters of blocks.

From: Excavation methods and stability control strategies for gob-side roadways based on spatiotemporal evolution

Rock formation

Bulk modulus

(Gpa)

Shear modulus

(Gpa)

Density (kg·m−3)

Friction angle (°)

cohesion (Mpa)

Tensile strength (Mpa)

Overlying strata

5.68

3.74

2500

32

0.62

1.12

Medium grained sandstone

6.41

5.43

2700

37

2.6

2.9

Argillaceous limestone

9.61

6.62

2608

28

15.69

4.42

Muddy limestone

14.02

8.41

2640

36

7.4

4.2

#5 coal

3.12

2.24

1406

31

3.88

0.83

Andy mudstone

9.39

3.13

2551

25

8.68

2.88

Fine sandstone

7.69

4.84

2250

35

2.6

1.31

Underlying strata

7.32

5.63

2580

34

2.4

1.28

Back to article page