Shock and Vibration / 2020 / Article / Tab 6

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.

AreaFailure type of coal seamSmax indexGeological structureOutburst precursor

Return air roadway in the 121901 working faceIII, IV1.4 (Φ42)Thinning of coal seam
Return air roadway in the 121901 working faceIII, IV4.5 (Φ42)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV11 (Φ75)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV18.8 (Φ75)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV18 (Φ75)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV5.5 (Φ42)Thickening of coal seam
Transportation roadway in the 121901 working faceIII, IV4.2 (Φ42)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV3.6 (Φ42)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV2.5 (Φ42)Thinning of coal seam
Transportation roadway in the 121901 working faceIII, IV3.1 (Φ42)Thinning of coal seam
2# connection roadway in the 121901 working faceIII, IV2 (Φ42)Thinning of coal seam
South return air roadway at the 1800 m levelIII, IV2.2 (Φ42)Thinning of coal seamCoal burst
Transportation roadway in the 121901 working faceIII, IV2.5 (Φ42)Thinning of coal seamEmission after pulling the drill pipe out
2# connection roadway in the 121901 working faceIII, IV1.5 (Φ42)Thinning of coal seamEmission after pulling the drill pipe out
2# connection roadway in the 121901 working faceIII, IV2.7 (Φ42)Thickening of coal seamEmission after pulling the drill pipe out

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