An investigation of energy consumption variation in rock blasting breaking with the resistance line

LEI Zhen; ZHANG Zhiyu; HUANG Yonghui; ZHOU Jiguo; BAI Ying

doi:10.11883/bzycj-2020-0214

Volume 41 Issue 7

Jul. 2021

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LEI Zhen, ZHANG Zhiyu, HUANG Yonghui, ZHOU Jiguo, BAI Ying. An investigation of energy consumption variation in rock blasting breaking with the resistance line[J]. Explosion And Shock Waves, 2021, 41(7): 075201. doi: 10.11883/bzycj-2020-0214

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LEI Zhen, ZHANG Zhiyu, HUANG Yonghui, ZHOU Jiguo, BAI Ying. An investigation of energy consumption variation in rock blasting breaking with the resistance line[J]. Explosion And Shock Waves, 2021, 41(7): 075201. doi: 10.11883/bzycj-2020-0214

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An investigation of energy consumption variation in rock blasting breaking with the resistance line

doi: 10.11883/bzycj-2020-0214

1.
Institute of Mining Engineering, Guizhou Institute of Technology, Guiyang 550003, Guizhou, China
2.
Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
4.
Experimental Center, Kunming Prospecting Design Institute of China Nonferrous Metals Industry Co., Ltd. Kunming 650051, Yunnan, China

Received Date: 2020-06-28
Rev Recd Date: 2020-09-16

Available Online: 2021-06-10

Publish Date: 2021-07-05

Abstract

Abstract

The topics such as fragmentation degree, active energy consumption and energy consumption efficiency of rock mass under explosive load have attracted increasing attention in recent years. However, it is very difficult to conduct such research due to its instantaneity, high temperature and high pressure characteristics. Systematic analysis and research on broken blocks of rock mass and the variation of energy utilization under explosion load with the different minimum resistance lines have been carried out. Plain concrete material was used to construct the model and carry out the model experiment. Theory of energy consumption in fracture mechanics was used to calculate the crushing energy. The basic fractal theory was used to calculate and analyze the fragmentation distribution law. Research results indicate that: the fractal dimension of broken blocks is between 1.2 and 1.7, exhibiting a good linear attenuation trend with the increase of the minimum resistance line from 120 mm to 200 mm; the crushing energy consumption increases first and then decreases. More specifically, the crushing energy consumption is 440.0 J at 120 mm, and increases to the maximum of 1 106.5 J at 180 mm, and then decreases to 1 084.8 J at 200 mm. The explosive energy utilization rate is between 4.57% and 12.51% and the maximum value corresponds to the minimum resistance line of 180 mm, the variation trend is consistent with that of the energy consumption value. The trend of broken fragmentation and utilization rate of energy consumption is opposite. There is an optimum minimum resistance line, corresponding to the optimized fragmentation degree and energy consumption utilization rate, in the model experiment is 160 mm which is 26.7 times the diameter of the charge. The research results can provide a theoretical basis for improving the explosive energy utilization rate and guide the design and construction processes in future engineering applications.
- fragmentation,
- energy explosion,
- energy efficiency,
- fractal dimension

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References(18)

References

[1]	WHITTLES D N, KINGMAN S, LOWNDES I, et al. Laboratory and numerical investigation into the characteristics of rock fragmentation [J]. Minerals Engineering, 2006, 19(14): 1418–1429. DOI: 10.1016/j.mineng.2006.02.004.
[2]	HAMDI E, DU MOUZA J, FLEURISSON J A. Evaluation of the part of blasting energy used for rock mass fragmentation [J]. Fragblast, 2001, 5(3): 180–193. DOI: 10.1076/frag.5.3.180.7386.
[3]	GRADY D E. Length scales and size distributions in dynamic fragmentation [J]. International Journal of Fracture, 2010, 163(1−2): 85–99. DOI: 10.1007/s10704-009-9418-4.
[4]	DARYADEL S S, MANTENA P R, KIM K, et al. Dynamic response of glass under low-velocity impact and high strain-rate SHPB compression loading [J]. Journal of Non-Crystalline Solids, 2016, 432: 432–439. DOI: 10.1016/j.jnoncrysol.2015.10.043.
[5]	杨仁树, 许鹏. 爆炸作用下介质损伤破坏的分形研究 [J]. 煤炭学报, 2017, 42(12): 3065–3071. DOI: 10.13225/j.cnki.jccs.2017.0107. YANG R S, XU P. Fractal study of media damage under blasting loading [J]. Journal of China Coal Society, 2017, 42(12): 3065–3071. DOI: 10.13225/j.cnki.jccs.2017.0107.
[6]	杨仁树, 李炜煜, 杨国梁, 等. 炸药类型对富铁矿爆破效果影响的试验研究 [J]. 爆炸与冲击, 2020, 40(6): 065201. DOI: 10.11883/bzycj-2019-0396. YANG R S, LI W Y, YANG G L, et al. Experimental study on the blasting effects of rich-iron ore with different explosives [J]. Explosion and Shock Waves, 2020, 40(6): 065201. DOI: 10.11883/bzycj-2019-0396.
[7]	李清, 王平虎, 杨仁树, 等. 切槽孔爆破动态力学特征的动焦散线实验 [J]. 爆炸与冲击, 2009, 29(4): 413–418. DOI: 10.11883/1001-1455(2009)04-0413-06. LI Q, WANG P H, YANG R S, et al. Experimental investigation on dynamic mechanical behaviors of cracks induced by V-notch borehole blasting with dynamic caustics [J]. Explosion and Shock Waves, 2009, 29(4): 413–418. DOI: 10.11883/1001-1455(2009)04-0413-06.
[8]	吴亮, 卢文波, 宗琦. 岩石中柱状装药爆炸能量分布 [J]. 岩土力学, 2006, 27(5): 735–739. DOI: 10.3969/j.issn.1000-7598.2006.05.010. WU L, LU W B, ZONG Q. Distribution of explosive energy consumed by column charge in rock [J]. Rock and Soil Mechanics, 2006, 27(5): 735–739. DOI: 10.3969/j.issn.1000-7598.2006.05.010.
[9]	冷振东, 卢文波, 范勇, 等. 侧向起爆条件下的爆炸能量分布及其对破岩效果的影响 [J]. 爆炸与冲击, 2017, 37(4): 661–669. DOI: 10.11883/1001-1455(2017)04-0661-09. LENG Z D, LU W B, FAN Y, et al. Explosion energy distribution by side initiation and its effects on rock fragmentation [J]. Explosion and Shock Waves, 2017, 37(4): 661–669. DOI: 10.11883/1001-1455(2017)04-0661-09.
[10]	胡振中, 庄亚明, 蔡天意, 等. 单颗粒煤岩冲击破碎能耗与粒度分布特性试验研究 [J]. 煤炭学报, 2015, 40(S1): 230–234. DOI: 10.13225/j.cnki.jccs.2014.1179. HU Z Z, ZHUANG Y M, CAI T Y, et al. Experimental study on energy consumption and particle size distribution of single particle coal under impact crushing [J]. Journal of China Coal Society, 2015, 40(S1): 230–234. DOI: 10.13225/j.cnki.jccs.2014.1179.
[11]	李祥龙, 王建国, 张智宇, 等. 应变率及节理倾角对岩石模拟材料动力特性的影响 [J]. 爆炸与冲击, 2016, 36(4): 483–490. DOI: 10.11883/1001-1455(2016)04-0483-08. LI X L, WANG J G, ZHANG Z Y, et al. Experimental study for effects of strain rates and joint angles on dynamic responses of simulated rock materials [J]. Explosion and Shock Waves, 2016, 36(4): 483–490. DOI: 10.11883/1001-1455(2016)04-0483-08.
[12]	甘德清, 刘志义, 李占金, 等. 冲击载荷作用下磁铁矿石破碎能耗特征 [J]. 岩石力学与工程学报, 2018, 37(S1): 3500–3506. DOI: 10.13722/j.cnki.jrme.2016.1150. GAN D Q, LIU Z Y, LI Z J, et al. Broken energy dissipation characteristics of magnetite under impact loads [J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(S1): 3500–3506. DOI: 10.13722/j.cnki.jrme.2016.1150.
[13]	武仁杰, 李海波, 李晓锋, 等. 冲击载荷作用下层状岩石破碎能耗及块度特征 [J]. 煤炭学报, 2020, 45(3): 1053–1060. DOI: 10.13225/j.cnki.jccs.2019.0266. WU R J, LI H B, LI X F, et al. Broken energy dissipation and fragmentation characteristics of layered rock under impact loading [J]. Journal of China Coal Society, 2020, 45(3): 1053–1060. DOI: 10.13225/j.cnki.jccs.2019.0266.
[14]	叶洲元, 李夕兵, 万国香, 等. 受三维静载压缩岩石对冲击能的吸收效应 [J]. 爆炸与冲击, 2009, 29(4): 419–424. DOI: 10.11883/1001-1455(2009)04-0419-06. YE Z Y, LI X B, WAN G X, et al. Impact energy-absorption property of rock under tri-axial compression [J]. Explosion and Shock Waves, 2009, 29(4): 419–424. DOI: 10.11883/1001-1455(2009)04-0419-06.
[15]	祝文化, 明锋, 宋成梓. 爆破荷载作用下岩体损伤破坏的分形研究 [J]. 岩土力学, 2011, 32(10): 3131–3135. DOI: 10.3969/j.issn.1000-7598.2011.10.040. ZHU W H, MING F, SONG C Z. Fractal study of rock damage under blasting loading [J]. Rock and Soil Mechanics, 2011, 32(10): 3131–3135. DOI: 10.3969/j.issn.1000-7598.2011.10.040.
[16]	于永江, 王来贵, 何峰. 煤体爆堆块度分布的测试 [J]. 煤炭学报, 2005, 30(3): 337–339. DOI: 10.3321/j.issn:0253-9993.2005.03.015. YU Y J, WANG L G, HE F. The fragmentation distribution testing of rock blasting [J]. Journal of China Coal Society, 2005, 30(3): 337–339. DOI: 10.3321/j.issn:0253-9993.2005.03.015.
[17]	BAO R H, ZHANG L C, YAO Q Y et al. Estimating the peak indentation force of the edge chipping of rocks using single point-attack pick [J]. Rock Mechanics and Rock Engineering, 2011, 44(3): 339–347. DOI: 10.1007/s00603-010-0133-2.
[18]	许金余, 刘石. 大理岩冲击加载试验碎块的分形特征分析 [J]. 岩土力学, 2012, 33(11): 3225–3229. XU J Y, LIU S. Research on fractal characteristics of marble fragments subjected to impact loading [J]. Rock and Soil Mechanics, 2012, 33(11): 3225–3229.