Research Article
A New Method for Predicting Coal and Gas Outbursts
Table 3
Failure type in the C9 coal seam, initial velocity of gas emission, and firmness coefficient.
| | Coal seam | Outburst parameter | | Sampling site | Failure type of coal seam | Initial velocity of gas emission, △P | Protodyakonov coefficient, f |
| | C9 | Return air roadway in the 121901 working face | V | 21 | 0.19 | | Transportation roadway in the 121901 working face | V | 23 | 0.18 | | connection roadway in the 121901 working face | V | 19 | 0.19 |
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