The floor failure zone caused by coal seam mining brings back the effective aquiclude thickness of coal seam floor,which is one of the key factors affecting the pressurized mining.Through the construction of floor boreholes in 2-3111 roadway and 2-3112 roadway of 2-311 working face in Ganhe Coal Mine,the strain sensor was placed in the borehole to detect the floor failure depth after the mining of 2#coal seam.The failure depth of coal seam floor was 16.41-17.49 m,with an average of 16.95 m.It can provide reference for the risk assessment of water inrush from floor of other working face of 2#coal seam in Ganhe Coal Mine.
维普
万方数据