Research Article
Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining
Table 4
Measured top coal block size.
| Horizon | Measuring point 1 | Measuring point 2 | Measuring point 3 | Measuring point 4 | Measuring point 5 | Measuring point 6 |
| The lower top coal fragmental size (cm) | 10 | 13 | 16 | 12 | 17 | 10 | The middle and lower top coal fragmental size (cm) | 42 | 47 | 49 | 46 | 50 | 40 | The middle top coal fragmental size (cm) | 18 | 20 | 21 | 18 | 23 | 16 | The middle and upper top coal fragmental size (cm) | 48 | 52 | 53 | 50 | 58 | 45 | The upper top coal fragmental size (cm) | 23 | 26 | 28 | 25 | 32 | 23 |
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