To address the challenges of poor stability in drilling chambers and complex development processes associated with vertical long-hole blasting in deep mining at the Ashele Copper Mine, the downward fan-shaped deep-hole blasting technique was proposed, with a focus on the influence of charging structures on blasting outcomes. Based on the dynamic Mohr-Coulomb strength criterion and the dynamic maximum tensile stress criterion, the radii of the crushed and fractured zones under different charging structures were calculated. With blasting fragmentation as the engineering control objective, the 1.8 m explosive -1 m air interval and 2 m explosive -1 m air interval schemes were identified as optimal. Numerical simulation demonstrates that under a hole layout with a hole bottom spacing of 3.6 m and row spacing of 3 m, these two charging structures achieve crack densities of 32.39% and 37.25%, respectively, significantly outperforming the comparative scheme by effectively enhancing rock fragmentation and reducing the risk of oversized fragments. Industrial trials show uniform blasting fragmentation, with an oversize fragment rate of 6.52% and a fines rate of 1.73%, meeting production requirements. The research results validate the rationality and feasibility of the optimized charging structure, providing a technical reference for efficient ore caving in similar deep metal mines.
XueXiaomeng, MoDongxun, LuoJia, et al. Application of large-diameter and deep-hole caving process in the mining of low-grade and thick deposits[J]. Mining Research and Development, 2020, 40(4): 8-11.
GuoLijie, LiuGuangsheng, MaQinghai, et al. Research progress on mining with backfill technology of underground metalliferous mine[J]. Journal of China Coal Society, 2022, 47(12): 4182-4200.
WeiHui. Research on mining technology of unmanned mining test stope in -645 m middle section of sanshandao gold mine[D]. Shenyang: Northeastern University, 2021.
SunXing, AnLong. Stope structure optimization and stability control of stage open stoping and subsequent filling mining method for deep low-grade resources[J]. Gold, 2023, 44(7): 75-82.
[11]
朱红兵. 空气间隔装药爆破机理及应用研究[D]. 武汉: 武汉大学, 2006.
[12]
ZhuHongbing. Study on the mechanism and application of air-decking blasting[D]. Wuhan: Wuhan University, 2006.
ZongQi, MengDejun. Theoretical discussion on the influence of different kinds of hole charging structures on explosion energy transmission[J]. Chinese Journal of Rock Mechanics and Engineering, 2003(4): 641-645.
LouXiaoming, LinJie, WangXinlong, et al. Characteristics of axial distribution of borehole wall pressure along the borehole of coupled charges with different borehole diameters under spherical detonation wave[J]. Journal of Harbin Institute of Technology, 2025, 57(3): 148-159.
LouXiaoming, WangZhenchang, ChenBigang, et al. Initial shock pressure analysis for hole wall with air-decked charge[J]. Journal of China Coal Society, 2017, 42(11): 2875-2884.
LouXiaoming, GuanXuhui, ZengLingfeng, et al. Characteristics of the impact pressure of the hole wall by interval charge at the hole bottom[J]. Explosion and Shock Waves, 2023, 43(6): 174-188.
[23]
YangR S, YouY Y, ZuoJ J, et al. Study of rock damage characteristics in decoupled slit charge blasting based on computer tomography scanning[J]. Engineering Fracture Mechanics, 2023, 290: 109532.
[24]
DingC X, YangR S, ChenC, et al. Space-time effect of blasting stress wave and blasting gas on rock fracture based on a cavity charge structure[J]. International Journal of Rock Mechanics and Mining Sciences, 2022, 160: 105238.
LiuYouping, GongMin, HuangGanghai. Numerical analysis method for optimizing charging structure of deep-hole blasting and its application[J]. Rock and Soil Mechanics, 2012, 33(6): 1883-1888.
ZhaoXingdong, SongJingyi, TianBin, et al. Optimization study by Zhongkai Mining on charge structure of large-diameter and deep-hole blasting[J]. Blasting, 2024, 41(1): 60-66.
HuTao, LiXianglong, GuanSi, et al. Numerical simulation of structure performance under blasting with piecewise charge[J]. Strategic Study of CAE, 2014, 16(11): 36-41.
[31]
ZhouN J, NieL, ShenS, et al. Simulation of charge structure effect to integrated rock blasting[J]. Applied Mechanics and Materials, 2011, 94-96: 2088-2091.
[32]
HuoX F, ShiX Z, QiuX Y, et al. Rock damage control for large-diameter-hole lateral blasting excavation based on charge structure optimization[J]. Tunnelling and Underground Space Technology, 2020, 106: 103569.
[33]
LiC X, YangR S, WangY B, et al. Theory and numerical simulation of deep hole cut blasting based on dispersed charge and staged detonation[J]. International Journal of Rock Mechanics and Mining Sciences, 2023, 169: 105453.
[34]
YouY Y, YangR S, ZuoJ J, et al. Research on the fragmentation characteristics of iron ore based on RHT constitutive model calibration and charge structure optimization[J]. Mining, Metallurgy & Exploration, 2024, 41(4): 1819-1834.
YanHonghao, ZhangXiaofei, ZhaoBibo, et al. Middle-deep hole blasting control basing on the optimization of charge shape[J]. Science Technology and Engineering, 2017, 17(28): 181-186.
SunBowen, GuoJian, LiBin, et al. Numerical simulation of the effect of decoupling coefficient on concentrated energy blasting under prestressed conditions[J]. Science Technology and Engineering, 2024, 24(10): 4048-4055.
CuiXuejiao, LiQiyue, LengZhendong, et al. A method for matching on-site mixed explosives with rocks based on controlling energy transfer efficiency[J]. Blasting, 2024, 41(3): 9-15.
[43]
冷振东. 岩石爆破中爆炸能量的释放与传输机制[D]. 武汉: 武汉大学, 2017.
[44]
LengZhendong. Explosion energy release and transmission mechanism in rock blasting[D]. Wuhan: Wuhan University, 2017.
LengZhendong, LuWenbo, YanPeng, et al. A new method of rock-explosive matching in drilling and blasting based on reasonable control of the crushed zone[J]. Strategic Study of CAE, 2014, 16(11): 28-35, 47.
ChenJunhua, ZhangJiasheng, LiXinping. Study of presplitting blasting parameters and its application based on rock blasting-induced damage theory[J]. Rock and Soil Mechanics, 2016, 37(5): 1441-1450.
[49]
凌天龙. 长城站开挖围岩爆破损伤与累积效应研究[D]. 北京: 中国矿业大学(北京), 2019.
[50]
LingTianlong. Study on blasting damage and cumulative effect of surrounding rock in excavation of Great Wall Station[D]. Beijing: China University of Mining and Technology-Beijing, 2019.
[51]
LingT L, LiS L, LiuD S, et al. Blasting damage of tunnel rock mass based on cumulative effect[J]. Rock Mechanics and Rock Engineering, 2022, 56(3): 1679-1695.
[52]
LiS L, LingT L, LiuD S, et al. Determination of rock mass parameters for the RHT model based on the Hoek-Brown criterion[J]. Rock Mechanics and Rock Engineering, 2023, 56(4): 2861-2877.