Research Article
Research on Development Mechanism and Criterion of Upward Fractures in Longwall Face Mining
Table 1
The material ratio of physical simulation experiment.
| Lithology | Thickness (m) | Depth (m) | Consumables (kg) | Sand | Plaster | Calcium carbonate | Fly ash |
| Loess | 21.79 | 21.79 | Sand (37.69): loess (37.69): silicone oil (8.29) | Fine-grained sandstone | 6.03 | 27.82 | 19.21 | 0.73 | 1.81 | | Siltstone | 16.86 | 44.68 | 58.23 | 1.91 | 4.60 | | Fine-grained sandstone | 1.77 | 46.45 | 6.04 | 0.23 | 0.53 | | Siltstone | 1.50 | 47.95 | 5.18 | 0.17 | 0.41 | | Fine-grained sandstone | 0.95 | 48.90 | 3.24 | 0.12 | 0.28 | | Medium-grained sandstone | 4.13 | 53.03 | 14.09 | 0.37 | 1.40 | | Coarse-grained sandstone | 4.37 | 57.4 | 14.91 | 0.39 | 1.49 | | Siltstone | 2.54 | 59.94 | 8.77 | 0.30 | 0.68 | | Fine-grained sandstone | 3.86 | 63.80 | 13.18 | 0.48 | 1.15 | | Siltstone | 1.81 | 65.61 | 6.25 | 0.21 | 0.49 | | Fine-grained sandstone | 1.79 | 67.40 | 6.11 | 0.23 | 0.53 | | Siltstone | 2.33 | 69.73 | 8.05 | 0.27 | 0.62 | | Fine-grained sandstone | 1.87 | 71.60 | 6.38 | 0.24 | 0.56 | | Medium-grained sandstone | 1.36 | 72.96 | 4.64 | 0.12 | 0.46 | | No. 1-2 coal seam | 4.00 | 76.96 | 5.44 | 0.28 | 1.36 | 5.44 | Siltstone | 6.04 | 83.00 | 20.84 | 0.72 | 1.63 | |
|
|