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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ZHANG Shiwen, LI Yinglei, CHEN yan, DAN Jiakun, GUO Zhaoliang, LIU Mingtao. Investigation on the technology of soft recovery of fragment produced by metal cylindrical shell subjected to explosive loading[J]. Explosion And Shock Waves, 2021, 41(11): 114102. doi: 10.11883/bzycj-2020-0449

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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

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