露天矿山深孔台阶压渣爆破参数优化研究

Optimization of Buffer Blasting Parameters for Deep⁃Hole Bench Blasting in Open⁃Pit Mine

为了提高露天矿山深孔台阶爆破质量,通过对某矿区现有台阶爆破参数和大块率进行现场调研,提出压渣爆破技术方案,结合LS⁃DYNA软件仿真分析与理论计算,得到适宜的孔网参数和压渣厚度,并将该参数应用于现场爆破试验。结果表明,压渣厚度5 m、孔间距5 m、抵抗线4 m为适宜爆破参数,该条件下现场爆破试验平均大块率小于7%,取得了良好的爆破效果。

In order to improve the effect of deep⁃hole bench blasting in open⁃pit mines,a buffer blasting technique was proposed based on the on⁃site investigation of existing bench blasting parameters and rock fragmentation.In combination with simulation study by using LS⁃DYNA software and theoretical calculation,optimal borehole parameters and buffer thickness were finally determined,which were applied into the field blasting experiment.With buffer thickness of 5 m,borehole spacing of 5 m and burden of 4 m,the field blasting experiment brought an average fragmentation of less than 7%,showing a good blasting effect.