北徐楼煤矿3下煤层赋存条件复杂，埋深大，具有强冲击倾向，在巷道施工过程中多次出现冲击。通过现场采用大直径钻孔卸压试验，分析了冲击显现形式，并对冲击危险区域进行分类，针对不同的区域采用不同直径钻孔卸压，确定了卸压钻孔布置的合理位置，取得了显著效果。%Complex geological condition,large buried depth and strong impact tendency of 3 lower coal seam in Beixulou coal mine has appeared many times rockburst in the tunnel construction process.Through depressurization test of using large diameter borehole,the rockburst form is analyzed,the impact zone is divided.Aiming at different area used different diameter borehole to depressurize,determined the reasonable position of depressurization hole,a-chieved obvious effects.
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