非电多段微差起爆网路在地下矿挤压爆破中的应用

利用非电多段微差爆破网路在5个钙芒硝地下矿进行了100多次挤压爆破,地表生态环境没有受到爆破震动的影响,矿石破碎质量得以改善。应用这种网路时,孔间和排间延时使用1～20段非电毫秒雷管,而线路间延时则用一定长度的导爆管来控制。文中简述了挤压爆破的机理;提出了计算排间延时间隔的经验公式;讨论了线路间延时的确定方法。此外,还介绍了这种网路的一个应用实例。

APPLICATION OF NONELECTRIC MULTIPLE-SHORT-DELAY BLASTING CIRCUIT IN UNDERGROUND SQUEEZING BLASTING

By use of the non electric multiple short delay blasting circuit,squeezing blasts of over 100 times were carried out in 5 underground mines of calcium saltpeterThe surface ecological environment was not subjected to effect of blasting vibration and the ore fragmentation was improvedWhen using this blasting circuit,non electric millisecond detonators of No 1～20 were used as hole to hole and row to row delays while a certain length of detonating tube was used for the delay interval of circuit to circuitIn this paper,the mechanism of squeezing blasting was briefly described,an empiric formula for calculation of row to row delay was put forward and the determination of circuit to circuit delay was discussedIn addition,a practical example of utilizing this blasting circuit was introduced