Research Article
Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining
Table 2
The strata physical and mechanical parameters.
| Lithology | Thickness (m) | Compressive strength (kg/cm2) | Bulk density (kg.mā3) |
| Main roof siltstone | 14 | 918 | 2700 | Immediate roof siltstone | 4 | 734 | 2650 | Coal | 2 | 208 | 1780 | Immediate floor siltstone | 8 | 758 | 2620 | Main floor siltstone | 20 | 1050 | 2670 |
|
|