吴庄铁矿二步回采深孔爆破参数优化研究

基于嗣后充填采矿法二步回采时,深孔爆破对充填体的损伤问题,以吴庄铁矿实际矿岩力学和爆破参数为基础,建立了基于LS-DYNA的不同孔底抵抗线的扇形深孔爆破模型,并进行了数值模拟,得出以下结论:随着孔底抵抗线的增大,振动速度和有效应力逐渐减小,爆破对充填体的损伤逐渐减小。结合数值模拟得出的结论,采用孔底抵抗线0.5 m的扇形孔爆破参数进行现场爆破试验,利用VS150三维激光扫描探测系统对矿山现场试验进行测量,并对扫描数据进行处理和分析,得出充填体表面较为平整,没有发生垮塌的情况,从而得出优化的扇形孔爆破参数,以指导今后井下爆破施工。

Optimization of Two-step Mining Deep-hole Blasting Parameters in Wuzhuang Iron Mine

In view of damage on backfill body resulting from the deep-hole blasting in the two-step mining process with subsequent filling mining method,and based on the rock mechanical properties and blasting parameters in Wuzhuang Iron Mine,the fan-patterned deep hole blasting model with different hole-bottom burden was established based on the LS-DYNA,and the related numerical simulation was carried out.The simulation results indicated that the vibration velocity and effective stress gradually decreased with the increase of the hole-bottom burden,and the damage of blasting on the filling body was reduced.The numerical simulation results showed that field experiments on fan-patterned hole blasting parameters with 0.5m hole-bottom burden were carried out,and VS150 three-dimensional laser scanning detection system was used to realize measurement.After processing and analyzing the scanning data,it is concluded that the surface of the filling body was smooth and no collapse occurred,thus the optimized fan-patterned hole blasting parameters was obtained to guide the underground blasting construction in the future.