为了尽快地实现三期设计,达到增产扩帮,南芬露天铁矿上盘扩帮由12m台阶改为18m台阶,在下降过程中,由于12m台阶与18m不完全吻合,在原12m台阶的安全平台、清扫平台处将部分产生大抵抗线,通过布孔方式与装药结构的研究,克服了这些大抵抗线。 In order to achieve the three-phase design as soon as possible and achieve expansion and expansion, the expansion of the Nanfen open-pit iron ore mine changed from 12m to 18m in the descending process. Since the 12m and 18m are not completely consistent with each other, , Some of the cleaning platform will have a general line of resistance, through the cloth hole and charge structure of the study to overcome these resistance line.