束状孔炮孔最佳间距的研究  

Optimal holes spacing of bunch-holes

作　　者：陈何 CHEN He(BGRIMM Technology Group,Beijing 100160,China;National Center for International Joint Research on Green Metal Mining,Beijing 102628,China)

机构地区：[1]矿冶科技集团有限公司,北京100160 [2]国家金属矿绿色开采国际联合研究中心,北京102628

出　　处：《有色金属（矿山部分）》2023年第4期78-81,96,共5页NONFERROUS METALS(Mining Section）

基　　金：国家重点研发计划项目(2017YFC0602904)。

摘　　要：束状孔炮孔的间距是决定束状孔爆破破岩有效性的关键因素。根据哈里斯模型,采用爆破漏斗试验的方法确定岩石极限抗拉应变值T,计算相邻两炮孔孔间距:b_(e)=(3.76~6.6)d 0;分析束状孔空隙率对炮孔联通性的影响,当束状孔内炮孔间距b_(e)≤5d 0时,束状孔内炮孔在爆破过程中可实现完全连通;通过爆破漏斗模型试验,建立爆破漏斗模型,爆破漏斗体积最大时的炮孔间距b_(e)=5.5 d 0。综合试验结果,束状孔合理炮孔间距b_(e)=(5~5.5)d 0。The holes spacing is the key factor to determine the rock breaking effectiveness of bunch-holes blasting.According to the Harris model,the ultimate tensile strain T of rock is determined by crater blasting test,and the spacing of two adjacent blast holes is calculated:b_(e)=(3.76~6.6)d 0.The influence of bunch-holes porosity on blast hole connectivity is analyzed.When the spacing of the holes b_(e)≤5d 0,the blast holes in the bunch-holes can be completely connected in the blasting process.Through the crater blasting model test,the crater blasting model is established.The blast hole spacing is b_(e)=5.5 d 0 when the crater volume is the largest.According to the comprehensive test results,the reasonable blast holes spacing b_(e)=(5~5.5)d 0.

关 键 词：束状孔 爆破 孔间距 连通性 爆破漏斗试验 

分 类 号：TD235.4[矿业工程—矿井建设]