回采进路大直径空孔掏槽爆破数值模拟研究  

Numerical Simulation Study on Large-diameter Empty-hole Cut Blasting in Stoping Drift

作　　者：汪宣灯 韩斌[1] 唐鹏飞 赵金田 WANG Xuandeng;HAN Bin;TANG Pengfei;ZHAO Jintian(Key Laboratory of Efficient Mining and Safety of Metal Mines,Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China;Jinchuan GroupCo.,Ltd,Jinchang,Gansu 737100,China)

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]金川集团有限公司,甘肃金昌市737100

出　　处：《矿业研究与开发》2020年第6期15-18,共4页Mining Research and Development

基　　金：国家科技支撑计划项目(2012BAB08B02);国家自然科学基金资助项目(51374034,51304011).

摘　　要：传统掘进爆破方式仅有单一的自由面,四周的夹制作用非常强,爆破效率低下,无法充分发挥炸药能量和中深孔爆破的优势。大直径空孔掏槽爆破通过在进路爆破掏槽孔周围布置空孔作为第二自由面以及改变应力场的分布,从而提高爆破效率。运用LS-DYNA对大直径空孔掏槽爆破进行爆破成腔过程分析,得出:在装药量减少情况下,爆破进尺可以达到3.0~3.2m,比传统的爆破进尺2.5 m提高了16%~25%。在金川二矿区一工区Ⅰ盘的现场工业试验表明,大直径空孔掏槽爆破的爆破进尺达到3.0~3.3m,能够显著提高爆破效率。The traditional tunneling blasting method only has one single free surface,and the surrounding limit is very powerful.As a result,the blasting efficiency is low and the advantages of explosive energy and medium-deep hole blasting cannot be fully brought into play.Using large-diameter empty-hole cut blasting method could improve the blasting efficiency by arranging the empty hole as the second free surface around the empty hole in the stoping drift and changing the distribution of stress field.LS-DYNA was used to analyze the process of large-diameter empty-hole blasting.It is concluded that the blasting footage could reach 3.0~3.2 m when the charge amount is reduced,which is 16%~25%higher than the traditional blasting footage of 2.5 m.The field industrial test in theⅠplate of the first working area in Jinchuan No.2 mining area shows that the blasting footage of largediameter empty-hole blasting method could reach 3.0~3.3 m,and the blasting efficiency has been significantly improved.

关 键 词：进路回采 大直径空孔 掏槽爆破 爆破进尺 数值模拟 

分 类 号：TD853[矿业工程—金属矿开采] TD236[矿业工程—矿山开采]