微差爆破对采场边坡的影响

Influence of millisecond blasting on slope of stope

为研究微差爆破对边坡的影响,针对特拉布拉露天煤矿工程实际,在计算单排孔微差爆破等效动力载荷的基础之上,建立采场边坡的有限元分析模型,分析边坡上质点运动速度,分析矿山当前爆破参数设置对采场边坡的影响。结果表明:炮孔的峰值载荷约1.05MPa,峰值载荷间隔约等于炮孔爆破间隔;坡脚点的最大震动速度为3.2mm/s,3个时刻的速度云图最大速度为17.82mm/s,最大速度出现在台阶的坡顶处,因此台阶坡顶处最易破坏;当前爆破参数下边坡不会出现失稳。

Millisecond blasting thesis is to study the impact on slope.According to the actual situation in Tel Alhambra opencast mines.Single row of holes millisecond blasting equivalent dynamic load is calculated.Finite element analysis model for stope slope successfully established.With the slope of the particle velocity,the paper studies the effects of mine blasting parameters set for the current stope slope.The results show:The peak load of blasthole is about 1.05MP.The intervals of peak load is approximately equal interval of hole blasting.The maximum vibration velocity of toe point is 3.2mm/s.The maximum speed of three times speed cloud is 17.82mm/s.The maximum speed appears in the hill top of the step.Therefore,the top of the hill of the step is the most easily damaged.Slope instability does not occur in the current blasting parameters.