Table 1 Physical and mechanical parameters of the coal seam and roof and floor strata46.
Stratum | Density (Kg/m3) | Elastic modulus (GPa) | Poisson’s ratio | Cohesion (MPa) | Internal friction angle (°) | Tensile strength (MPa) |
|---|---|---|---|---|---|---|
Roof | 2700 | 7.78 | 0.25 | 3.98 | 32 | 3.34 |
Coal Seam | 1300 | 1.35 | 0.35 | 2.0 | 25 | 1.0 |
Floor | 2700 | 7.78 | 0.25 | 3.98 | 32 | 3.34 |
