地下金属矿山扇形中深孔孔网参数优化研究

为改善某地下金属矿山爆破块度不均匀问题, 对扇形中深孔孔网参数进行了优化, 对不同孔距和排距进行了模拟分析。结果表明, 孔距1.6~2.0 m、排距不大于1.6 m时可以取得良好的爆破效果;对比监测点的等效应力峰值后推断顶底板的稳定性以及爆破块度, 综合考虑凿岩成本和炸药单耗, 最终选择孔网参数为: 孔距1.8 m、排距1.6 m。现场爆破结果表明, 与原有孔网参数爆破效果相比, 应用优化后的孔网参数爆破所得矿石D₂₀提高了37%、D₈₀下降了41%。

Parameter Optimization for Middle-Depth Blastholes in a Fan-Shaped Drilling Pattern in a Underground Metal Mine

In order to improve the uneven blast fragmentation in a underground metal mine, the parameters for the medium-depth blastholes drilled in a fan pattern were optimized based on the simulation and analysis of blastholes with different hole spacing and row spacing. The results show that good blasting effect can be obtained with the hole spacing of 1.6~2.0 m and the row spacing less than 1.6 m. The stability of roof and floor, as well as  the blast fragmentation were deduced based on the peak value of equivalent stress on the points to be monitored. Then, with the drilling cost and unit consumption of explosive taken into consideration, it was finally determined that blastholes were in an arrangement with hole spacing of 1.8 m and row spacing of 1.6 m. The in-situ blasting results show that compared to the original arrangement, the optimized blasthole parameters can increase the yield of the ore of D20 size by 37%, and decrease the ore of D80 size by 41%.