Research Article
A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China
Table 2
#311103 working face key strata calculation statistics table.
| Type of rock | Thickness of each layer hi (m) | Volume force γi (kN/m3) | Elastic modulus Ei (GPa) | | Calculated result |
| Medium-grain sandstone | 13.45 | 23 | 23 | 326.16 | The key strata | Fine grain sandstone | 3.5 | 24 | 21 | 380.69 | — | Medium-grain sandstone | 12.96 | 23 | 23 | 298.08 | The key strata | Sandy mudstone | 12.2 | 25 | 15 | | — |
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