Research Article
Controlled Roof Collapse during Secondary Mining in Coal Mines
| h(m) | = 120 m
| = 500 m
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| 0.1 | 9.26 | 4.54 | 0.2 | 18.53 | 9.08 | 0.3 | 27.80 | 13.62 | 0.4 | 37.06 | 18.16 | 0.5 | 46.33 | 22.7 | 0.6 | 55.60 | 27.23 | 0.7 | 64.86 | 31.77 | 0.8 | 74.12 | 36.31 | 0.9 | 83.39 | 40.85 | 1 | 92.65 | 45.39 |
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