Research Article
Evolution Law of Coal Seam Abutment Pressure under the Influence of Shallow Buried Complex Strata: A Case Study
Table 4
Mechanical parameters of rock formation.
| | Category | Lithology | Thickness (m) | Bulk modulus (GPa) | Shear modulus | Density (kg/m3) | Internal friction angle (。) | Cohesion (MPa) | Tensile strength (MPa) |
| | Roof | Fine grained sandstone | 15 | 5.67 | 3.05 | 2560 | 28 | 2.7 | 5.1 | | Mudstone | 8.5 | 2.8 | 1.26 | 2080 | 30 | 2.8 | 1.2 | | Sandy mudstone | 5 | 3.16 | 2.46 | 2380 | 31 | 3.0 | 3.0 |
| | Coal seam | 2–2 coal | 5.5 | 1.4 | 0.54 | 1400 | 32 | 1.0 | 0.7 |
| | Floor | Sandy mudstone | 5 | 3.16 | 2.46 | 2380 | 31 | 3.0 | 3.0 | | Fine grained sandstone | 8 | 5.67 | 3.05 | 2560 | 28 | 2.7 | 5.1 |
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