Research Article
A New Method for Predicting Coal and Gas Outbursts
Table 6
Index S of the weight of drilling cuttings based on geological structure and precursor areas of outbursts.
| | Area | Failure type of coal seam | Smax index | Geological structure | Outburst precursor |
| | Return air roadway in the 121901 working face | III, IV | 1.4 (Φ42) | Thinning of coal seam | — | | Return air roadway in the 121901 working face | III, IV | 4.5 (Φ42) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 11 (Φ75) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 18.8 (Φ75) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 18 (Φ75) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 5.5 (Φ42) | Thickening of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 4.2 (Φ42) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 3.6 (Φ42) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 2.5 (Φ42) | Thinning of coal seam | — | | Transportation roadway in the 121901 working face | III, IV | 3.1 (Φ42) | Thinning of coal seam | — | | 2# connection roadway in the 121901 working face | III, IV | 2 (Φ42) | Thinning of coal seam | — | | South return air roadway at the 1800 m level | III, IV | 2.2 (Φ42) | Thinning of coal seam | Coal burst | | Transportation roadway in the 121901 working face | III, IV | 2.5 (Φ42) | Thinning of coal seam | Emission after pulling the drill pipe out | | 2# connection roadway in the 121901 working face | III, IV | 1.5 (Φ42) | Thinning of coal seam | Emission after pulling the drill pipe out | | 2# connection roadway in the 121901 working face | III, IV | 2.7 (Φ42) | Thickening of coal seam | Emission after pulling the drill pipe out |
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