露天开采台阶逐孔起爆爆破震动数值模拟  

Numerical Simulation of Blast Vibration During Sequential Bench Blasting in Surface Mining

作　　者：田胜杰 张树东 TIAN Shengjie;ZHANG Shudong(Sijiaying Yanshan Iron Mine Co.,Ltd.,Hebei Iron ＆ Steel Group,Tangshan Hebei 063700,Chin)

机构地区：[1]河北钢铁集团司家营研山铁矿有限公司,河北唐山063700

出　　处：《昆明冶金高等专科学校学报》2018年第1期1-5,16,共6页Journal of Kunming Metallurgy College

摘　　要：为了控制露天台阶爆破中的震动效应,采用ANSYS/LS-DYNA软件模拟逐孔起爆过程中不同起爆延时条件下爆破弹性破坏区质点震动速度的变化规律。结果表明,相邻炮孔起爆形成的应力波阵面相互叠加或削弱可引起质点震动的强弱变化,炮孔孔距9 m时不同延时条件下岩石质点的震动速度变化规律相似;起爆后20~50 ms内质点三向震动速度的合成速度均值最小,因此孔距9 m时台阶微差爆破的最佳起爆延时为20~50 ms。To control the bench blasting vibration in surface mining,the study introduced the software ANSYS/LS-DYNA to simulate the evolution of particle vibration velocity. The simulation was carried out in regard to elastic fracture zones in sequential bench blasting with various initiation delays. The results showed that the enhancement or weakness of blasting stress waves leaded to corresponding variations of particle vibration velocity,and these variations were similar regardless of initiation delays when the blast hole intervals were 9 m. Additionally,the resultant vibration velocity was minimum during 20 ~ 50 ms after initiation. Therefore,the optimal initiation delayed intervals in bench millisecond blasting were inferred as 20 ~ 50 ms when the blast hole intervals were 9 m.

关 键 词：台阶爆破 微差爆破 起爆延时 震动速度 

分 类 号：TD854[矿业工程—金属矿开采]