Research Article
A Study on the Impact of Longwall-Mining Operation on the Stability of a Slope-Pillar Structure
Table 1
The material ratio of the model.
| | Lithology | Thickness (cm) | Material ratio number | Consumable (kg/cm) | | Sand | Gypsum | Calcium carbonate | Coal ash | Loess |
| | Loess soil | 44 | 20 : 1 | 9.14 | — | — | — | 0.45 | | Medium-grained sandstone | 12 | 737 | 8.4 | 0.36 | 0.94 | — | — | | No. 2-2 seam | 2.5 | 20 : 1 : 2 : 20 | 2.0 | 0.1 | 0.2 | 2.0 | — | | Siltstone | 4 | 837 | 8.53 | 0.32 | 0.75 | — | — | | Coal streak | 0.5 | 20 : 1 : 2 : 20 | 2.0 | 0.1 | 0.2 | 2.0 | — | | Siltstone | 12 | 837 | 8.53 | 0.32 | 0.75 | — | — | | Fine sandstone | 6 | 746 | 8.4 | 0.48 | 0.72 | — | — | | Siltstone | 5 | 837 | 8.53 | 0.32 | 0.75 | — | — | | No. 3-1 seam | 2 | 20 : 1 : 2 : 20 | 2.0 | 0.1 | 0.2 | 2.0 | — | | Siltstone | 2 | 837 | 8.53 | 0.32 | 0.75 | — | — |
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