Research Article
The Properties of a Coal Body and Prediction of Compound Coal-Rock Dynamic Disasters
Table 5
Prediction cycle drilling chip amount index S with changing hole depth.
| Prediction hole depth (m) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Prediction times | 107 | 122 | 115 | 112 | 94 | 94 | 79 | 76 | 56 | 47 | Smax (kg/m) | 18.5 | 64 | 36 | 26 | 42 | 73 | 48 | 40 | 42 | 30 | Smin (kg/m) | 0.6 | 0.8 | 0.6 | 1.2 | 1.8 | 1.8 | 2.2 | 1.6 | 1 | 1.2 | Average value of S (kg/m) | 2.4 | 3.4 | 4.8 | 4.7 | 5.6 | 7.1 | 7.7 | 7.8 | 8.2 | 7.4 |
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