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在深孔爆破中,由于硝铵类炸药卷与炮孔壁间存在着径向间隙,在其装药长度超过5卷、单雷管一端起爆时,就会产生间隙效应(又称外沟槽效应)。这种效应常使炸药传爆至一定距离后爆轰中止,直接影响深孔爆破的效果和巷道掘进速度。 为在实际中探讨影响间隙效应的因素和可能采取的改善或完全消除间隙效应的措施,我们从一九七四年起,在开滦马家沟矿进行了743次模拟和现场试验。
In the deep-hole blasting, there is a radial gap between the ammoniacal explosive and the blasthole wall. When the length of charge is more than 5 volts, the detonation effect will occur when the single detonator is detonated at one end (also known as the outer groove effect ). This effect often causes the explosives to burst to a certain distance after the detonation stops, directly affecting the effect of deep-hole blasting and roadway driving speed. In order to explore in practice the factors that affect the gap effect and possible measures to improve or completely eliminate the gap effect, we conducted 743 simulations and field tests at Kailuan Majiagou Mine since 1974.