摘要
为适应现代化大型露天矿爆破的需要和新爆破器材、工艺的普及,大孔径、高台阶、气体间隔以及孔内微差爆破等一系列技术在现场逐步进入摸索应用阶段,但相关爆破参数和理论需要进行深入研究。以包钢集团巴润矿露天台阶爆破为研究模型,利用数值模拟和现场试验相结合的方法进行分析研究。根据现场工艺技术条件,建立了台阶高度24 m、孔径310 mm、空气间隔装药等6组模型,采用数码电子雷管孔内短微差时间中间气体间隔起爆进行研究。研究得到:在下部药柱底部起爆点距离0.5 m先起爆,孔内间隔时间为3 000 us上部药柱顶部再起爆的组合下,爆破应力波在岩体内作用时间最长,监测点平均有效应力极值点最高。通过对巴润矿进行高台阶孔内微差爆破工业试验,研究提出的孔内微差爆破参数切实可行。
In order to meet the needs of modern large-scale open-pit mine in blasting and popularize new blasting equipment and technology, a series of techniques such as large aperture, high step, gas interval and in-hole millisecond blasting gradually come into a stage of exploration and application, but related blasting parameters and theory need an in-depth research. Taking the open-pit blasting of Baotou Mine under Baotou Iron and Steel Group as the research case, the numerical simulation and field test was combined to make analysis and research. According to the on-site technical conditions, six sets of models, such as step height at 24 m, hole diameter at 310 mm, and interval charge, were established, and the study on in-hole short-difference air-decked detonation was carried out by using the digital electronic detonator. It is found that that the blasting stress wave acting on the rock mass is the longest and the average effective stress extreme point of the monitoring point is the highest under the condition that the distance of the initiation point from the bottom of the lower charge is at 0.5 m and the detonation of upper charge starts after the interval time in the hole for 3 000 us. Through the industrial test of the high-step millisecond hole blasting in the Barur mine, the proposed in-hole millisecond blasting parameters is feasible.
作者
常建平
张鹏飞
段军
王梦瑶
宝音吉雅
CHANG Jianping;ZHANG Pengfei;DUAN Jun;WANG Mengyao;BAO Yinjiya(Institute of Mining Research,Inner Mongolia University of Science and Technology,Baotou 014010,China;Barun Mining Co.,Ltd.,Baotou Steel Group,Baotou 014080,China)
出处
《金属矿山》
CAS
北大核心
2020年第12期81-87,共7页
Metal Mine
基金
内蒙古科技大学矿业研究院重点项目(编号:包钢股份技开合字(2018)第002号)
内蒙古自治区高等学校科学研究项目(编号:NJYT-20-A21)
内蒙古自治区自然科学基金项目(编号:2019MS05011)。
关键词
高台阶
微差爆破
数值模拟
应力场规律
起爆顺序
high step
millisecond blasting
numerical simulation
stress field law
initiation sequence
