巴润矿台阶爆破效果数值分析研究

Numerical Analysis of Bench Blasting Effect in Barun Mine

台阶爆破过程中底盘抵抗线、孔径大小和超深尺寸都会对爆破效果和施工进度产生影响。为获得内蒙古白云鄂博西矿台阶爆破最佳底盘抵抗线、孔径和超深尺寸,采用ANSYS/DYNA数值仿真模拟了底盘抵抗线(550,600cm),孔径(150,310mm),超深(75,100cm)8组不同的模型,分析了坡底面位置处岩体应力变化曲线,由模拟应力峰值得出底盘抵抗线、孔径、超深值分别为600cm,150mm,100cm和550cm,310mm,75cm两组最佳爆破参数,并在实际工况下进行了爆破效果验证,结果与模拟效果基本吻合。

In the process of bench blasting,chassis resistance line,hole diameter and ultra-deep dimension will affect the blasting effect and construction progress.In order to obtain the optimum chassis resistance line,hole diameter and ultra-deep dimension of bench blasting in western Bayan Obo Mine,Inner Mongolia,eight different models with chassis resistance line(550 cm,600 cm),hole diameter(150 mm,310 mm)and ultra-deep dimension(75 cm,100 cm)were simulated by ANSYS/DYNA numerical simulation.The stress variation curve of rock mass at the bottom of slope was analyzed.The best two sets of blasting parameters with chassis resistance line,hole diameter and ultra-deep dimension were(600 cm,150 mm,100 cm)and(550 cm,310 mm and 75 cm),respectively.The blasting effect was verified under actual conditions,and the results were basically consistent with the simulation results.