METHOD FOR EFFICIENT GAS DRAINAGE IN COAL ROADWAY STRIPS AND REGIONAL OUTBURST ELIMINATION THROUGH STAGED FRACTURING WITH LONG BOREHOLE FLOOR BEDDINGS

摘要

The present invention applies to projects such as regional outburst elimination for coal roadway driving or for coal extraction, and discloses a method for efficient gas drainage in coal roadway strips and regional outburst elimination by performing staged fracturing with long borehole floor beddings. Staged fracturing is performed by drilling a floor bedding borehole (5) into a hard floor stratum (2) of a coal seam (1) having outburst risk in an existing roadway (3) along a direction of a coal seam roadway (4) to be driven, and regional outburst elimination on coal road strips is performed by stage-by-stage drainage or drainage in a whole stage by means of fractured fissures; and it is determined, according to a drainage amount, whether drainage has reached a set standard; if so, a coal seam borehole (6) is constructed along boundaries on both sides of the coal seam roadway within a range of effective outburst prevention measures, an effectiveness test on the regional outburst prevention measures and further drainage are performed; and then coal seam roadway driving is performed while enforcing a rule of regional verifying measures and partial four-in-one measures. The present invention has advantages such as replacement of roadways with boreholes, a low number of boreholes, a wide fracturing range, a low degree of stress concentration in coal bodies surrounding fracturing regions, effective pressure relief, a short period of time in reaching a drainage standard, good applicability in coal seam parameters, and a wide range of applications.