Research Article
Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining
Table 7
Parameters of top coal and direct roof.
| | Horizon | Thickness (cm) | Weighted volume (cm3/each) | Sieving length (mm) | P (g/cm3) |
| | Bottom (soft) | 4.6 | 0.0301 | 5 | 1.403 | | Middle-bottom (hard) | 9.2 | 1.8182 | 17.5 | 1.352 | | Middle (soft) | 7.4 | 0.09901 | 7.5 | 1.357 | | Middle-top (hard) | 10 | 4.5333 | 20 | 1.367 | | Top (soft) | 6.8 | 0.4118 | 10 | 1.354 | | Bottom (white) | 5.2 | 0.9667 | 12.5 | 1.517 | | Top (red) | 5.2 | 1.3333 | 15 | 1.357 | | Bottom | 14.5 | 26.6667 | 40 | 1.493 |
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