Research Article
Study on Overburden Stability and Development Height of Water Flowing Fractured Zone in Roadway Mining with Cemented Backfill
Table 1
Stratification and mechanical parameters of overlying strata in coal seam.
| Layer number | Lithology | Cumulative depth (m) | Layer thickness (m) | Bulk density (KN/m3) | Tensile strength (MPa) | Elastic modulus (GPa) |
| 1 | Topsoil | 4.8 | 4.8 | 13.8 | — | — | 2 | Gravelly sand | 28.98 | 23.18 | 24 | — | — | 3 | Glutenite | 48.98 | 20 | 26.2 | 1.4 | 5 | 4 | Sandy mudstone | 54.67 | 5.69 | 25.5 | 1.0 | 3 | 5 | Glutenite | 81.97 | 27.3 | 26.4 | 1.6 | 5.1 | 6 | Coal | 85.04 | 3.07 | 14 | 0.84 | 2 | 7 | Glutenite | 107.01 | 21.97 | 26.4 | 1.7 | 5.2 | 8 | Coal | 109.01 | 2 | 14 | 0.82 | 2 | 9 | Sandy mudstone | 124.01 | 15 | 25.8 | 0.9 | 3 | 10 | Coal | 126.51 | 2.5 | 14 | 0.85 | 2 | 11 | Sandstone | 135.31 | 8.8 | 26.2 | 1.8 | 10.4 | 12 | Glutenite | 139.51 | 4.2 | 26.4 | 1.5 | 4.8 | 13 | No. 6 coal | 154.51 | 15 | 14 | 0.85 | 2 |
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