FAN Xiao-feng;

• 1:Jiangsu Nanjing Geological Engineering Survey Institute Co.
• 2:Ltd.
• 3:Suzhou Branch

Abstract：

In open-pit mining operations,blasting fragmentation quality critically determines mining production efficiency and serves as a key benchmark for evaluating bench blasting performance. This study investigates parameter optimization through field experiments conducted during overburden rock stripping in a deep-hole bench blasting project at an open-pit coal mine,systematically analyzing how blasting parameters influence fragmentation outcomes and ultimately proposing optimized blasting parameters with fragmentation characteristics as the primary evaluation criterion. The results demonstrate that the powder factor has the greatest influence on the average fragmentation size,followed by hole spacing and stemming length. For the blasting uniformity coefficient,stemming length shows the greatest impact,while powder factor and hole spacing have lesser effects. Regarding boulder yield,that powder factor again proves most influential,with hole spacing and stemming length following. Optimal parameter ranges were determined as 0. 3 ～ 0. 33 kg/m3 for that powder factor,5 ～ 5. 5 m for hole spacing,and 2. 5 m for stemming length.

Key Words： field test;blasting fragmentation;parameter optimization;open pit coal mine;bench blasting

Abstract:

Keywords:

Foundation:

Authors: FAN Xiao-feng;

References：

• [1]王凯，张智宇，高腾飞．某露天采场深孔台阶爆破空气间隔装药的应用[J]．爆破，2018,35(1):80-85.[1]WANG Kai,ZHANG Zhi-yu,GAO Teng-fei. The application of air interval charging in deep hole bench blasting of a certain open-pit mining site[J]. Blasting,2018,35(1):80-85.(in Chinese)
• [2]管志强，张中雷，王林桂，等．复杂环境大区露天深孔台阶爆破技术在岙山油库区开挖中的应用[J]．爆破，2011,28(2):63-67.[2]GUAN Zhi-qiang,ZHANG Zhong-lei,WANG Lin-gui,et al. Application of open-pit deep hole step blasting technology in complex environmental areas during excavation of Aoshan oil storage area[J]. Blasting,2011,28(2):63-67.(in Chinese)
• [3]郭进平，刘益超，李角群，等．基于三维巷道模型的深孔爆破扇形布孔优化设计[J]．工程爆破，2021,27(2):66-72.[3]GUO Jin-ping,LIU Yi-chao,LI Jiao-qun,et al. Optimization design of fan shaped hole layout for deep hole blasting based on 3D tunnel model[J]. Engineering Blasting,2021,27(2):66-72.(in Chinese)
• [4]Babaeian M,Ataei M,Sereshki F,et al. A new framework for evaluation of rock fragmentation in open pit mines[J]. Journal of Rock Mechanics and Geotechnical Engineering,2019,11(2):325-336.
• [5]孙增，崔峻语，韩文松，等．台阶爆破孔间延时时间优化模拟实验研究[J]．工程爆破，2024,30(1):74-81,103.[5]SUN Zeng,CUI Jun-yu,HAN Wen-song,et al. Simulation experiment research on optimization of differential delay time between step blasting holes[J]. Engineering Blasting,2024,30(1):74-81,103.(in Chinese)
• [6]李世明，胡保宁，赵增祥，等．地下水封洞库施工巷道开挖爆破技术研究[J]．工程爆破，2023,29(6):81-89.[6]LI Shi-ming,HU Bao-ning,ZHAO Zeng-xiang,et al. Study on blasting technology of construction tunnel of underground water-sealed cavern[J]. Engineering Blasting,2024,2023,29(6):81-89.(in Chinese)
• [7]汪飞．复杂环境下露天矿山爆破及安全控制[J]．工程爆破，2022,28(4):120-124,130.[7]WANG Fei. Open-pit blasting and safety control in a complex environment[J]. Engineering Blasting,2022,28(4):120-124,130.(in Chinese)
• [8]吴贤振，余敏，吴强．铜坑矿中深孔凿岩爆破参数优化试验研究[J]．黄金，2011,32(5):3l-33.[8]WU Xian-zhen,YU Min,WU Qiang. Experimental study on optimization of deep hole drilling and blasting parameters in Tongkeng mine[J]. Gold,2011,32(5):3l-33.(in Chinese)
• [9]肖雄，余佑林．扇形中深孔采矿中凿岩爆破参数的试验确定及其应用[J]．中国钼业，2011,32(5):3l-33.[9]XIAO Xiong,Yu You-lin. Experimental determination and application of rock drilling and blasting parameters in fanshaped deep hole mining[J]. China Molybdenum Industry,2011,32(5):3l-33.(in Chinese)
• [10]刘连生，夏胜明，曾鹏，等．基于工程地质分区的某钨矿爆破参数优化[J]．工程爆破，2024,30(4):42-50.[10]LIU Lian-sheng,XIA Sheng-ming,ZENG Peng,et al.Blasting parameter optimization of a tungsten mine based on engineering geological zoning[J]. Engineering Blasting,2024,30(4):42-50.(in Chinese)
• [11]张继春，钮强，徐小荷．用灰关联分析方法确定影响岩体爆破质量的主要因素[J]．爆炸与冲击，1993(3):212-218.[11]ZHANG Ji-chun,NIU Qiang,XU Xiao-he. Using grey relational analysis method to determine the main factors influencing the quality of rock mass blasting[J]. Explosion and Shock,1993(3):212-218.(in Chinese)
• [12]朱志彬，刘成平．中深孔凿岩爆破参数试验研究[J]．矿业研究与开发，2009,29(5):90-92.[12]ZHU Zhi-bin,LIU Cheng-ping. Experimental study on parameters of medium and deep hole rock drilling and blasting[J]. Mining Research and Development,2009,29(5):90-92.(in Chinese)
• [13]尹岳降，李瑞泽，陈明，等．基于正交试验法的爆破块度分布影响因素敏感性分析[J]．爆破，2019,36(4):37-42.[13]YIN Yue-jiang,LI Rui-ze,CHEN Ming,et,al. Sensitivity analysis of influencing factors on blasting block size distribution based on orthogonal experimental method[J].Blasting,2019,36(4):37-42.(in Chinese)
• [14]周游，陈作彬，王静，等．最小抵抗线对深孔岩石爆破块度的影响[J]．工程爆破，2016,22(6):70-74.[14]ZHOU You,CHEN Zuo-bin,WANG Jing,et al. The influence of minimum resistance line on the fragmentation of deep hole rock blasting[J]. Engineering Blasting,2016,22(6):70-74.(in Chinese)
• [15]WEN Yi-ping,LAI Nan-jun,DU Zhao-feng,et al. Application of orthogonal experiment method in foam flooding system composition and injection parameter optimization[J]. Journal of Petroleum Science and Engineering,2021,204:108663.(in Netherlands)
• [16]邹宗山，崔峻语，和铁柱，等．孔间延时时间对台阶爆破块度影响试验研究[J]．工程爆破，2023,29(6):75-80.[16]ZOU Zong-shan,CUI Jun-yu,HE Tie-zhu,et al. Experimental research on the delay time between holes on the fragmentation of bench blasting[J]. Engineering Blasting,2023,29(6):75-80.(in Chinese)
• [17]翟小鹏，杨军，陈占扬，等．基于应变率变化的爆破块度预测模型及应用[J]．工程爆破，2022,28(6):73-79,118.[17]ZHAI Xiao-peng,YANG Jun,CHEN Zhan-yang,et al.Predictive model and application of blasting fragmentation based on train rate change[J]. Engineering Blasting,2022,28(6):73-79,118.(in Chinese)
• [18]陈起建．隧道岩体爆破碎片预测方法对比研究[J]．工程爆破，2023,29(4):78-86.[18]CHEN Qi-jian. Comparative study on prediction methods of blasting debris in tunnel rock mass[J]. Engineering Blasting,2023,29(4):78-86.(in Chinese)