Research Article
Influence Law of Interbedded Strata and Their Collapse on the Mining of Extremely Thick Coal Seam under Goaf
Table 2
The statistics of top coal, immediate roof, and main roof collapsing interval of 80 cm (40 m) interlayer.
| | No. | Name | Face advanced distance | Periodic roof weighting pace | | Model (cm) | Reality (m) | Model (cm) | Reality (m) |
| | 1 | Top coal caving | 72.0 | 36.0 | 72.0 | 36.0 | | 2 | First roof caving | 74.0 | 37.0 | 74.0 | 37.0 | | 3 | 1st roof weighting pace | 85.0 | 42.5 | 85.0 | 42.5 | | 4 | 1st periodic roof weighting | 122.0 | 61.0 | 37.0 | 18.5 | | 5 | 2nd periodic roof weighting | 152.0 | 76.0 | 30.0 | 15.0 | | 6 | 3rd periodic roof weighting | 185.0 | 92.5 | 33.0 | 16.5 | | 7 | 4th periodic roof weighting | 223.0 | 111.5 | 38.0 | 19.0 | | 8 | 5th periodic roof weighting | 254.0 | 127.0 | 31.0 | 15.5 | | 9 | 6th periodic roof weighting | 284.0 | 142.0 | 30.0 | 15.0 | | 10 | Average | | | 33.17 | 16.58 |
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