Research Article
Study on Overburden Stability and Development Height of Water Flowing Fractured Zone in Roadway Mining with Cemented Backfill
Table 7
Physical and mechanical parameters of coal seam and overlying strata.
| | Layer number | Lithology | Layer thickness (m) | Bulk density (kN/m3) | Tensile strength (MPa) | Bulk modulus (MPa) | Shear modulus (MPa) | Internal friction angle (°) | Cohesion (MPa) |
| | 1 | Topsoil | 5 | 13.8 | — | — | — | — | — | | 2 | Gravelly sand | 24 | 24 | — | — | — | — | — | | 3 | Glutenite | 20 | 26.2 | — | — | — | — | — | | 4 | Sandy mudstone | 5 | 25.5 | — | — | — | — | — | | 5 | Glutenite | 28 | 26 | 1.6 | 2976 | 2049 | 33 | 3.6 | | 6 | Coal | 3 | 14 | 0.84 | 2083 | 746 | 28 | 1.2 | | 7 | Glutenite | 24 | 26.4 | 1.7 | 3462 | 2177 | 34 | 3 | | 8 | Coal | 2 | 14 | 0.82 | 1944 | 795 | 28 | 1.1 | | 9 | Sandy mudstone | 15 | 25.8 | 0.9 | 2273 | 1172 | 38 | 1.8 | | 10 | Coal | 3 | 14 | 0.85 | 1875 | 672 | 28 | 1 | | 11 | Sandstone | 9 | 26.2 | 1.8 | 5778 | 4333 | 34 | 3.2 | | 12 | Glutenite | 4 | 26.4 | 1.5 | 2857 | 1967 | 32 | 2.5 | | 13 | No. 6 coal | 15 | 14 | 0.85 | 2381 | 735 | 28 | 1.2 | | 14 | Glutenite | 30 | 26.4 | 1.5 | 3077 | 1935 | 32 | 2.75 | | | Backfill body | | 18.2 | 0.85 | 405 | 279 | 23 | 0.85 |
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