Changes in rock pressure manifestations when working pre-wetted coal seams
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The distance from the working face to the abutment pressure maximum (the plastic zone in the vicinity of the face) greatly increases with increasing moisture content of the solid coal.
The stress concentration coefficient in the abutment pressure zone depends on the extent of the plastic zone, and decreases with increase in the latter.
Pre-wetting of wide areas of solid coal has a beneficial effect on the behavior of the surrounding rock. Roof displacement in the supported waste area is less for wetted seams than for nonwetted seams, worked under the same conditions.
KeywordsCoal Seam Plastic Zone Rock Burst Rock Pressure Increase Moisture Content
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