Analysis and optimization of coal seam drilling pressure relief efficiency in impact hazardous areas

Cao Yuanwei; Li Gelin; Qi Zhengbing; Deng Yi

doi:10.19896/j.cnki.mtkj.2025.03.002

Abstract：In response to the problems of short pressure relief distance,large deviation of corner drilling trajectory,lagging pressure relief between the two sides,and multiple blind spots in pressure relief in coal body drilling in impact hazardous areas,two coal seam drilling layout methods,namely the excavation face drilling site and the adjacent roadway drilling site,were designed based on the engineering background of pressure relief in the anti-collision area of the No.52109 material roadway excavation working face of Xukuang Group Tianshan Mining Company's Okhobrak Coal Mine.The pressure relief characteristics were analyzed.There were generally pressure relief blind spots in front of the excavation face drilling site,on the two sides,and at the upper and lower corners.The adjacent roadway drill-ing site achieved sufficient pressure relief and eliminated the pressure relief blind spots.Two types of stress relief drilling strategies were designed:one at the roadway cross section and the other from adjacent roadway.The stress relief effect of these strategies was subse-quently analyzed.By establishing two quantitative indicators for pressure relief efficiency analysis,namely pre pressure relief area ratio and the pressure relief index in single excavation,the pre relief area rate of the adjacent roadway drilling site increased from 5.63%to 48.00%compared to the excavation face drilling site,and the pressure relief index in single excavation increased by 1.91 m.The opti-mized drilling layout was applied in the No.52109 material roadway,eliminating pressure relief blind spots during excavation,reducing mining vibration frequency and energy,and achieving safe and anti-collision excavation.