摘要
针对阶段采场切割立槽爆破施工难度大、成本高的问题,以山东某矿山为工程背景,开展阶段采场“品”字形无井切槽爆破机理研究.采用LS-DYNA数值模拟方法,分析“品”字形无井切槽爆破与垂直深孔落矿阶段矿房法无井切槽爆破的差异性,揭示了“品”字形无井切槽爆破的多自由面效应.数值计算结果表明,“品”字形无井切槽爆破方法,在侧向自由面与底部自由面组合作用下,柱状炮孔在长度方向上爆破应力分布更加均匀,增加了爆破在自由面处的破岩能力,降低了爆破对未爆区的损伤,提高了爆破能量的利用率.综合比较,“品”字形无井切槽爆破方法超挖率降低了23.2%,有效破岩应力增加12 MPa,未爆区围岩振动值降低了16.7%,大幅改善了阶段采场的切槽爆破效果.
To response to high difficulty and cost in the blasting operation for cutting vertical slots in sublevel stope,a mine in Shandong as the engineering background is used to conduct research on the blasting mechanism of the“pin”‑shaped slotting without raise in sublevel stope.The LS-DYNA numerical simulation method is employed to analyze the differences between the“pin”‑shaped without raise cutting blasting and the VCR method cutting blasting.The study reveals the multi‑free‑surface effect of the“pin”‑shaped blasting for slot cutting.The numerical results show that under the combined action of lateral and bottom free surfaces,the blasting stress distribution of the cylindrical blastholes in the“pin”‑shaped without raise cutting blasting method is more uniform along their length,enhancing the rock‑breaking capability at the free surfaces,reducing damage to the unexploded area,and improving the utilization of blasting energy.Through comprehensive comparison,the overbreak rate of the“pin”‑shaped without raise cutting blasting method is reduced by 23.2%,the effective rock‑breaking stress is increased by 12 MPa,and the vibration values of the surrounding rock in the unexploded area are reduced by 16.7%,significantly improving the blasting effect of slot cutting in sublevel stope.
作者
安龙
韩琳
王智
孙星
AN Long;HAN Lin;WANG Zhi;SUN Xing(Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819,China.;Shandong Gold Group Xihe County Zhongbao Mining Co.,Ltd.,Shandong Gold Group,Longnan 742199,China)
出处
《东北大学学报(自然科学版)》
CSCD
北大核心
2024年第11期1612-1620,1628,共10页
Journal of Northeastern University(Natural Science)
基金
国家重点研发计划项目(2022YFC2903802)。
关键词
阶段采场
切槽爆破
自由面
等效应力
爆破振动
sublevel stope
slot blasting
free face
equivalent stress
blasting vibration
