Green Mining Technology of Coal Gangue Grouting Filling of Separated Overlying Strata
In order to solve the problem of excessive amount of coal gangue and surface subsidence in Hulusu Coal Mine,the green mining technology of gangue grouting filling in the separated overlying strata was adopted to fill the key layers.Based on the critical layer discrimination theory,the sub critical layer 1 overlying the 21404 fully-mechanized mining face was determined as the grouting target area.Through 14 grouting boreholes with a spacing of 160 m,the maximum surface subsidence was effectively controlled to be 85.89 mm.While the surface subsidence was stable,it achieved a large consumption of coal gangue,which is an important means of balancing the output and consumption of coal gangue.
grouting filling of separated overlying stratasurface subsidencecritical layergrouting drilling
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