摘要
在深部急倾斜薄矿体中深孔爆破过程中,由于围岩的夹制力作用,在生产实践过程中往往存在“爆不开”或“爆太开”的情况,从而导致采矿损失贫化大等问题。针对某矿山的开采技术条件,基于PFC 2D数值模拟软件对深部急倾斜中深孔爆破过程进行数值模拟,量化分析深部急倾斜薄矿体中深孔爆破过程中有无围岩夹制力对爆破效果的影响,确定炮孔直径为65 mm,排距(抵抗线)为1.6 m。现场应用表明:爆破后效果良好,大块率较低,矿石贫化率为15%,采矿损失率为5%,炸药单耗为0.6 kg/t,数值模拟结果与现场爆破效果相近,相应的爆破参数可指导现场生产。
During the medium long-hole blasting process in deep steeply inclined thin ore bodies,the surrounding rock's compression force often causes issues such as"inadequate blasting"or"excessive blasting"during production practice.This leads to significant mining losses and ore dilution.Based on the mining technical conditions of a specific mine and using PFC 2D numerical simulation software to numerically simulate the medium long-hole blasting process in deep steeply inclined thin ore bodies,a quantitative analysis was performed on the impact of surrounding rock compression force on blasting effects in deep steeply inclined thin ore bodies.It was determined that the borehole diameter should be 65 mm and the blast spacing(resistance line)should be 1.6 m.Field applications showed that the blasting results were satisfactory with a low block rate,an ore dilution rate of 15%,a mining loss rate of 5%,and an explosive consumption of 0.6 kg/t.The numerical simulation results were consistent with field blasting effects,and the corresponding blasting parameters can guide on-site production.
作者
张小瑞
贾志伟
安龙
Zhang Xiaorui;Jia Zhiwei;An Long(Changchun Gold Research Institute Co.,Ltd.;Key Laboratory of Ground Control Management Plan in Deep Metal Mines,National Mine Safety Administration;China National Gold Group Co.,Ltd.;Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines,Northeastern University)
出处
《黄金》
CAS
2024年第8期52-57,共6页
Gold
基金
国家重点研发计划项目(2022YFC2903802)。
关键词
深部开采
中深孔落矿
中深孔爆破
急倾斜薄矿体
数值模拟
高夹制力
deep mining
medium long-hole caving
medium long-hole blasting
steeply inclined thin ore body
numerical simulation
high compression force
作者简介
张小瑞(1987-),女,工程师,硕士,从事金属矿山采矿技术研究工作,E-mail:1042140972@qq.com。
