Table 1 Physical and mechanical parameters of coal strata.
Lithology | Density (kg/m3) | Bulk modulus (GPa) | Tension (MPa) | Cohesion (MPa) | Internal friction Angle (°) |
|---|---|---|---|---|---|
Mudstone | 2200 | 6.3 | 5.50 | 1.04 | 35 |
Siltstone | 2500 | 12.5 | 3.00 | 4.16 | 38 |
Limestone | 2580 | 12.5 | 4.90 | 3.96 | 41.8 |
Coal | 1350 | 2.08 | 1.00 | 1.20 | 20 |
Silty mudstone | 2250 | 6.25 | 2.60 | 1.46 | 34 |
Sandy mudstone | 2290 | 7.25 | 1.46 | 1.46 | 38 |
Muddy siltstone | 2450 | 10.25 | 2.26 | 1.86 | 34 |
