缓冲爆破减震效应研究

STUDY OF SHOCK ABSORPTION EFFECT OF BUFFER BLASTING

为研究缓冲爆破在露天矿生产爆破中对预留边帮的保护作用,基于缓冲爆破参数理论设置合理的缓冲爆破参数并分别得出设置缓冲孔和未设置缓冲孔爆破试验振动实测数据;运用LS-DYNA显式非线性动力分析有限元程序建立有限元模型,分别对设置缓冲孔和未设置缓冲孔2种露天矿台阶生产爆破进行数值模拟,结合露天矿现场爆破效果和振动测试试验数据对比分析,得出距离爆源越近,缓冲爆破减震率越大和加入缓冲孔可提高预裂孔半孔率最高可达30%;在数值模拟结果和现场试验数据对比分析的基础上,得出加入缓冲孔在有预裂孔的同等条件下的生产爆破,降振率最高可达51%,对预留边帮有极大保护作用。

the study of protective effect of buffer blasting on the reservation slope in open-pit mine is decribed. Based on the data of blasting vibration in the open-pit mine, the data of blasting experimental vibration on having or not having buffer blasting hole are given by setting reasonable buffer blasting parameters. Using FEM program of LS-DYNA, the two different numerical models are made to study the bench blast. and comparative analysis of the simulation results with the results of field experiment makes a conclusion that the more near from is the explosion source, the better decreasing effect is; and half cast factor can be improved mostly 30% of the presplitting blast hole. On the basis of comparative analysis of the simulation results and the field experimental data, it is concluded that it will decrease the blasting vibration 51% under the same condition with having the presplitting blast hole at mostly, so it will do strongly protective effect on the reservation boundary working slope.