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为了对煤矿巷道围岩深孔卸压爆破效果进行验证,利用瞬变电磁法探测围岩深孔爆破前后视电阻率的分布,通过爆破前后视电阻率等值线图,分析深孔爆破破坏区分布。经分析,井下同一探测区域岩层在深孔卸压爆破前后岩体视电阻率发生明显变化,说明深孔爆破引发岩体的松动破裂。爆破孔间距为10 m时,卸压爆破后炮孔间围岩球形破坏区相互联通和重叠,说明孔间距较为合理,能够在岩体内形成连续破坏区。
In order to verify the blasting effect of deep hole blasting in surrounding rock of coal mine roadway, the distribution of apparent resistivity before and after deep hole blasting of surrounding rock is detected by using transient electromagnetic method. Through the contour map of apparent resistivity before and after blasting, distributed. The analysis shows that the apparent resistivity of rock mass changes obviously before and after deep-hole pressure-relief blasting in the same exploration area, which shows that the deep-hole blasting causes the rock mass to loosen and rupture. When the blasting hole spacing is 10 m, the spherical failure zones around the blasting holes after the pressure-relief blasting are interlinked and overlapped, indicating that the spacing between the holes is more reasonable and a continuous failure zone can be formed in the rock mass.