How to prevent the highlight of Shimen when uncovering coal?

Large protruding often occurs in Shimen opened outburst danger coal layers. Therefore, when Shimen uncovers coal and has a tendency to build a mine or highlight a new level of mine development, the wells must be specially designed for the uncovering of the coal seams, and reported to the coal management department at or above the county level for approval according to the management authority. Requirements are:

(1) Shimen avoids being arranged in complex and damaged areas of geological structures.

(2) Before the protruding coal seam is exposed, it is necessary to make a prominent risk prediction.

(3) When the working face is 10 meters away from the normal of the coal seam, at least two holes with full thickness penetrating the coal seam shall be drilled to accurately grasp the coal seam occurrence and gas condition.

(4) When the working face is 5 meters away from the normal of the coal seam, at least two boreholes with a full thickness of the penetrating coal seam or a depth of not less than 10 m are measured, and the gas pressure of the coal seam and the risk of predicting coal seam protrusion are determined.

(5) Between the working face and the coal seam, a rock pillar with a certain thickness must be maintained in order to implement the anti-burst measures. The thickness of the rock pillar is determined according to the requirements of the anti-burst measures, the nature of the rock, and the dip angle of the coal seam. When using the vibration and shooting measures, the minimum distance between the working face and the normal to the coal seam is: 2 meters in the steeply inclined coal seam; 1.5 meters in the inclined and gently inclined coal seam. If the rock formation is soft and broken, the normal distance should also be increased.

(6) Shimen expose outburst coal seam predict when a prominent danger, gas drainage, hydraulic punching, drilling discharge, or other metal skeleton After testing effective preventive measures must be taken to highlight. After the effectiveness test of the measures, if there is no outstanding danger, it shall be reported to the Mining Bureau for approval, and the coal seam shall be exposed by long-distance shooting; otherwise, the coal seam shall be exposed by vibration.

(7) The coal seam can only be exposed from the top or bottom side of the coal seam and the full thickness of the coal seam should be exposed as much as possible.

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