Research Article
Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf
Table 3
The maximum roadway deformation.
| | Distance from open cut (m) | 40 | 173 | 268 | 357 | 455 | 502 |
| | Roof fall (mm) | 24 | 20 | 30 | 19 | 29 | 18 | | Rib convergence (mm) | 12 | 19 | 25 | 17 | 20 | 14 |
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