Research Article
Study on Overburden Stability and Development Height of Water Flowing Fractured Zone in Roadway Mining with Cemented Backfill
Table 2
Load of overlying strata and identification of key strata above coal seam.
| Layer number | Lithology | Layer thickness (m) | Key stratum | Load (kPa) |
| 2 | Gravelly sand | 23.18 | — | — | 3 | Glutenite | 20 | — | 1146.56 | 4 | Sandy mudstone | 5.69 | — | 145.1 | 5 | Glutenite | 27.3 | Main key stratum | 1621.85 | 6 | Coal | 3.07 | — | 42.98 | 7 | Glutenite | 21.97 | Inferior key stratum | 622.33 | 8 | Coal | 2 | — | 28 | 9 | Sandy mudstone | 15 | — | 414.31 | 10 | Coal | 2.5 | — | 35 | 11 | Sandstone | 8.8 | Inferior key stratum | 279.5 | 12 | Glutenite | 4.2 | — | 110.88 |
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