大孤山铁矿预裂爆破研究与应用

Application and Research of Pre-splitting Blasting In Dagushan Iron Mine

大孤山露天铁矿靠帮爆破采用预裂爆破技术。为了寻求最优的预裂爆破参数,利用LS-DYNA软件对不同爆破参数条件下的预裂爆破过程进行数值模拟,分析模拟结果得出大孤山铁矿靠帮预裂爆破的最优炮孔间距和不耦合系数等预裂爆破参数。根据所模拟的最优预裂爆破参数,进行现场耦合预裂爆破和不耦合预裂爆破对比试验。不耦合预裂成缝效果显著且爆破施工对保留边坡震动小,有利于维护边帮稳定,得到良好的预裂爆破效果。数值模拟所确定的爆破参数可应用于大孤山铁矿靠帮爆破中,对现场爆破施工具有实际指导意义。

The blasting near slope of Dagushan open-pit iron usually adopts pre-split blasting technology. In order to seek for the optimal pre-splitting blasting parameters,LS-dyna software was used to make numerical simulations of pre-splitting blasting process under different blasting parameters. From analysis on the numerical simulation,the pre-splitting blasting parameters of Dagushan iron mine were achieved,such as the optimal pre-splitting blast hole spacing and the decoupling coefficient. According to the simulated optimal pre-splitting blasting parameters,contrast tests between field coupling pre-splitting blasting and decoupling blasting were made. The retention effect of the decoupling pre-split blasting is notable and the small slope vibration from blasting construction was conducive to maintaining the slope stability,and getting a good pre-splitting blasting effect. The blasting parameters determined by numerical simulation can be applied in Dagushan Iron Mine end-slope blasting,which has practical guiding significance for the on-site construction blasting.