Research Article
Prediction of Mining Subsidence in Shallow Coal Seam
Table 1
Physical and mechanical properties of coal and rock.
| Rock formation | Tensile strength σt (MPa) | Cohesion C (MPa) | Internal friction angle φ (°) | Bulk modulus K (GPa) | Shear modulus G (GPa) | Poisson’ ratio |
| Topsoil | 0.48 | 0.51 | 34 | 0.83 | 0.46 | 0.27 | Bedrock | 2.0 | 2.42 | 39 | 4.2 | 2.6 | 0.26 | Limestone | 1.77 | 2.02 | 40 | 4.00 | 2.40 | 0.25 | Mudstone | 0.93 | 1.07 | 35 | 2.29 | 1.06 | 0.30 | Fine sandstone | 1.40 | 2.73 | 42 | 8.15 | 4.43 | 0.27 | Mudstone | 0.93 | 1.07 | 35 | 2.29 | 1.06 | 0.30 | No. 5 coal | 1.10 | 1.60 | 38 | 4.18 | 1.40 | 0.35 | Mudstone | 0.93 | 1.07 | 35 | 2.29 | 1.06 | 0.30 | Fine sandstone | 1.40 | 2.73 | 42 | 8.15 | 4.43 | 0.27 | Limestone | 1.77 | 2.02 | 40 | 4.00 | 2.40 | 0.25 |
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