Table 1 Mechanical parameters of the rock material.

From: Study on the anchorage mechanism and roof stability control technology of bolts in fractured or weak surrounding rock

Lithology classification

Thickness (m)

Density (kg/m3)

Bulk modulus (GPa)

Shear modulus (GPa)

Cohesion (MPa)

Friction (°)

Tensile strength (MPa)

Sandy mudstone

22

2446

10.76

5.7

1.18

35

1.64

Gritstone

13

2890

7.35

6.63

3.04

40

4.34

Mudstone

4

2400

2.88

1.53

1.17

26

0.98

Coal

3

1400

1.35

0.63

26

32

2

Sandy mudstone

3

2446

10.76

5.7

1.18

35

1.64

Medium sandstone

5

2590

3.3

2.5

4

37

1.2

Mudstone

20

2400

2.88

1.53

1.17

26

0.98

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