Table 1 Physical and mechanical parameters of coal rock formations.

From: Analysis of the impact of the combined use of rebar bolts and FRP bolts in the roadway enclosure

Rockiness

Density (kg·m−3)

Bulk modulus (GPa)

Shear modulus (GPa)

Angle of internal friction (°)

Cohesion (MPa)

Tensile strength (MPa)

Sandy mudstone

2510

2.56

2.36

36.5

2.26

1.21

Coal seam

1314

2.918

0.987

34.3

1.98

1.39

Sandy mudstone

2540

2.56

2.36

36.5

2.26

1.21

Fine-grained sandstone

2510

5.56

3.92

23.25

2.50

1.35

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