Risk analysis and prevention of rock burst during gob-side roadway breakthrough in Hujirt mining area
In order to study the mechanism of rock burst during the gob-side roadway driving with small coal pillars underthick and hard roof in Hujirt mining area,the stress distribution model and FLAC3D numerical model during the roadway breakthrough gob-side roadway were established based on the mine pressure behavior during the breakthrough of 11-3107 gob-side roadway in Menkeqing Coal Mine.The stress evolution characteristics of heading face at different distances from the roadway breakthrough point were compared,and the mechanism of rock burst during the roadway breakthrough of gob-side roadway was revealed.The deformation of roadway surrounding rock and coal body stress were measured by means of cross distribution method,stress,micro seismic and other monitoring methods.Based on mechanism analysis and field measurement,the integrated technology of pressure relief and support was proposed.The results show that due to the existence of thick and hard rock strata above the roof of the coal seam,after the excavation of the roadway,the thick and hard rock strata act on the surrounding rock of the roadway through stress transfer,resulting in large deformation of the roof,floor and side of the roadway lagging behind the tunneling head;As the tunneling head gets closer to the breakthrough point of the gob-side roadway,the deformation of the roadway gradually increases;According to the deformation increase rate of the roadway,when the tunneling head is about 160 m from the breakthrough point,the roadway deformation begins to increase sharply;the microseismic events mainly occurs in the roadway at 190～60 m from the roadway breakthrough point,and the theoretical calculation is consistent with the field mine pressure behavior.
roadway breakthroughgob-side roadwaystress transferpressure relief-supportthick and hard roof
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