摘要
角柱形掏槽在提高巷道爆破进尺方面起到了主要作用,因此对角柱形掏槽爆破参数进行深入分析,能够更好地提高巷道掘进效率。结合补偿空间理论和经验公式确定了最适宜孔间距为179 mm,并运用LS-DYNA数值模拟软件建立多种数值计算模型,对岩巷掘进中角柱形掏槽的孔间距、掏槽孔布置和延时段数等参数进行了分析。结合数值计算和现场爆破效果综合分析,得出最适宜孔间距为170 mm,最优布孔方式为两段毫秒延时起爆模型4,最优起爆方式为两段毫秒延时起爆。应用最优参数的新方案对比旧方案发现:爆破进尺增加了0.7 m,炸药单耗降低了0.11 kg/m^(3),合速度峰值振动速度平均减少了0.12 cm/s。研究表明:新方案不仅能够提高掘进效率和经济效益,还能减少振动带来的影响,保障巷道掘进安全施工。研究结果可为角柱形掏槽爆破参数优选提供参考,对于类似施工条件的爆破方案设计具有一定的指导意义。
Corner column cutting plays an important role in improving roadway blasting footage,so in-depth analysis of corner column cut blasting parameters can better improve roadway driving efficiency. Combined with the compensation space theory and empirical formula,the optimal hole spacing is determined to be 179 mm,and a variety of numerical calculation models are established using LS-DYNA numerical simulation software. The parameters such as the hole spacing,the layout of the cut hole and the number of delay segments in the rock roadway excavation are analyzed. Combined with numerical calculation and comprehensive analysis of on-site blasting effect,the optimal hole spacing is 170 mm,the optimal hole layout method is two-segment millisecond delay initiation model 4,and he optimal initiation mode is two-segment millisecond delay initiation.Compared with the old scheme,the new scheme using the optimal parameters found that the blasting footage increased by 0. 7m,the unit consumption of explosives decreased by 0. 11 kg/m^(3),and the peak vibration speed of resultant speed decreases by 0. 12 cm/s on average. The study results show that the new scheme can not only improve the excavation efficiency and economic benefits,but also reduce the impact of vibration,and guarantee safe construction of roadway excavation. The study results can provide a reference for the optimization and selection of corner column cut blasting parameters,and have a certain guiding significance for the blasting scheme design under similar construction conditions.
作者
段宝福
柴明星
张正欣
孙宗军
DUAN Baofu;CHAI Mingxing;ZHANG Zhengxin;SUN Zongjun(School of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Shandong Province Key Laboratory for Disaster Prevention and Reduction of Civil Engineering,Qingdao 266590,China;Qingdao Ruihan Technology Group,Qingdao 266061,China)
出处
《金属矿山》
CAS
北大核心
2023年第1期151-160,共10页
Metal Mine
基金
山东省自然科学基金项目(编号:ZR2020ME096)
爆破工程湖北省重点实验室开放基金项目(编号:BL2021-24)
青岛西海岸新区高层次人才团队项目(编号:RCTD-JC-2019-06)。
关键词
矿山爆破
角柱形掏槽
数值计算
毫秒延时爆破
掏槽爆破
mine blasting
corner column cut
numerical calculation
millisecond delay blasting
cut blasting
