A New Method for Predicting Coal and Gas Outbursts
Table 5
Gas desorption index K1 of drilling cuttings based on geological structure and precursor areas of outbursts.
Area
Failure type of the coal seam
K1max index
Geological structure
Outburst precursor
Return air roadway in the 121901 working face
III, IV
0.56
Thinning of coal seam
—
Return air roadway in the 121901 working face
III, IV
0.83
Thinning of coal seam
—
Return air roadway in the 121901 working face
III, IV
0.89
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.82
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.95
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.69
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.80
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.57
Thickening of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.83
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.70
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.85
Thinning of coal seam
—
Transportation roadway in the 121901 working face
III, IV
0.74
Thinning of coal seam
—
connection roadway in the 121901 working face
III, IV
1.01
Thinning of coal seam
—
connection roadway in the 121901 working face
III, IV
1.04
Thinning of coal seam
—
South return air roadway at 1800 m level
III, IV
0.72
Thinning of coal seam
Coal burst
Transportation roadway in the 121901 working face
III, IV
0.78
Thinning of coal seam
Emission after pulling the drill pipe out
connection roadway in the 121901 working face
III, IV
0.88
Thinning of coal seam
Emission after pulling the drill pipe out
connection roadway in the 121901 working face
III, IV
0.88
Thickening of coal seam
Emission after pulling the drill pipe out
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