超深对露天矿台阶爆破影响数值模拟研究

Numerical simulation of influence of ultra depth on bench blasting in open-pit mines

为了研究超深对露天矿台阶爆破的影响,运用大型显式非线性动力分析软件LS-DYNA建立有限元模型,分别对有超深和无超深两种工况台阶爆破进行数值模拟,结果表明,从有效应力和最大主应力的角度,有超深工况的有效应力最高可达65.8MPa,最大主应力最高可达47.4MPa,均远大于无超深工况的情况,表明超深对台阶爆破有效应力和主应力均有较大的影响。

The numerical simulations of the two conditions of ultra depth and not ultra depth in bench blasting are conducted by the finite element model built with the program LS-DYNA.The results showed that the effective stress and the maximum principle stress could be up to 65.8MPa and the 47.4MPa respectively under the condition of ultra depth,,far greater than the figures under the condition of not ultra depth.This indicated that the ultra depth has a great impact on both the effective stress and the maximum principal stress of bench blasting.