Application of bedding gas extraction drillings in pressure relief for rockburst prevention

JIANG Junjun

doi:10.11799/ce202507014

Abstract：As high gas mines gradually enter the realm of deep mining,rockburst hazard is becoming prominent.In response to this problem,the bedding drilling gas extraction for pressure relief and rockburst prevention in high gas mine was discussed.The research results indicate that:Extraction drilling can reduce the stress of coal,and the pressure relief effect of the extraction drilling is slightly weaker than that of large-diameter pressure relief drilling.By utilizing the lateral stress zoning characteristics of the surrounding rock of the roadway,improved sealing process of extraction and pressure relief drilling,the sealing section of the borehole is transformed from single section sealing to a double section sealing.The extraction and pressure relief technology was established and applied to the high gas mine working face.Field test results show that:After the construction of extraction and pressure relief drilling,the average maximum energy of microseismic events decreased by 4000 J,the average daily energy decreased by 1000 J,which indicated that the roof activity was significantly weakened.The displacement of the two sides was reduced by 300 mm,the proximity of the roof and floor was reduced by 100 mm,indicating obvious improvement in the deformation control of the roadway surrounding rock.The results proved that bedding drilling can relieve the pressure of the coal seam in the mining space,which serves for the purposes of gas extraction and pressure relief for rockburst prevention.