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Mechanical properties of coal and rock mass.
| Lithology | Bulk density (kN/m3) |
Bulk modulus (GPa) |
Shear modulus (GPa) |
Tensile strength (MPa) |
Cohesion (MPa) |
Friction angle (°) |
|---|---|---|---|---|---|---|
| No. 10 coal | 15.65 | 3.0 | 1.5 | 0.75 | 0.8 | 28 |
| Limestone | 26.50 | 8.0 | 3.9 | 2.35 | 2.82 | 35 |
| Mudstone | 25.88 | 3.2 | 1.8 | 1.45 | 1.81 | 30 |
| Sandy mudstone | 24.12 | 4.5 | 3.1 | 2.21 | 2.31 | 33 |
