Table 2 Mechanical parameters of coal and rock.
Rock | Unit Weight (kg/m3) | Bulk Modulus (GPa) | Shear Modulus (GPa) | Poisson’s Ratio | Compressive Strength (MPa) | Cohesion (MPa) | Angle of Internal Friction (°) |
|---|---|---|---|---|---|---|---|
Medium sandstone | 2530 | 3.3 | 3.8 | 0.14 | 32 | 4.5 | 20.4 |
Gravelly coarse sandstone | 2462 | 3.5 | 2.2 | 0.22 | 15 | 1.5 | 33 |
#5 coal | 1350 | 1.5 | 1 | 0.30 | 6 | 1.0 | 23 |
Carbon mudstone | 1530 | 3.8 | 1.6 | 0.35 | 26 | 0.8 | 23 |
Coarse sandstone | 2640 | 5.3 | 4.8 | 0.13 | 25 | 4.2 | 28 |
