Table 1 Physical and mechanical parameters of No. 2 coal seam and overlying strata.
Lithology | Thickness (m) | Bulk Density (T/m³) | Poisson’s Ratio (ν) | Uniaxial compressive strength (MPa) | Uniaxial tensile strength (MPa) | Elastic modulus (GPa) |
|---|---|---|---|---|---|---|
2# Coal Seam | 3.5 | 1.4 | 0.31 | 18 | 1.7 | 3.5 |
Fine-Grained Sandstone (FGS) (feldspar-dominated) | 2.6 | 2.6 | 0.25 | 55 | 3.0 | 11 |
Sandy Mudstone | 3.0 | 2.6 | 0.30 | 70 | 3.3 | 10 |
Siltstone (Ss) | 5.0 | 2.6 | 0.25 | 80 | 4.3 | 12 |
Medium-Grained Sandstone (MGS) | 2.6 | 2.6 | 0.25 | 85 | 4.6 | 15 |
Fine-Grained Sandstone (FGS) (quartz-dominated) | 23.0 | 2.6 | 0.25 | 90 | 5.0 | 18 |
