Experimental study on the blasting effects of rich-iron ore with different explosives

YANG Renshu; LI Weiyu; YANG Guoliang; MA Xinmin

doi:10.11883/bzycj-2019-0396

Volume 40 Issue 6

Jun. 2020

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YANG Renshu, LI Weiyu, YANG Guoliang, MA Xinmin. 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

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YANG Renshu, LI Weiyu, YANG Guoliang, MA Xinmin. 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

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Experimental study on the blasting effects of rich-iron ore with different explosives

doi: 10.11883/bzycj-2019-0396

YANG Renshu^{1, 2
,},
LI Weiyu^{1, 3
,
,},
YANG Guoliang³,
MA Xinmin³

1.
State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology, Beijing 100083, China
2.
Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China
3.
School of Mechanics and Architecture Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received Date: 2019-10-16
Rev Recd Date: 2020-03-18

Available Online: 2020-05-25

Publish Date: 2020-06-01

Abstract

Abstract

In order to investigate the influence of different explosives type on the blasting effects, three kinds of explosives with the same quality were used to carry out blasting test on iron ore samples. The fractal dimension of surface crack and fragment size distribution of specimens were comparatively studied, and then the damage degree and blasting effects of specimens were quantitatively compared and evaluated. At the same time, the differences of blasting effects are analyzed theoretically from the angle of explosion stress wave superposition, energy release and energy transfer. The results are as follows. (1) Both loose charge and mixed charge will cause the uniformity of the explosion stress field distribution to deteriorate. (2) The greater the explosion heat, the greater the energy released after explosion; the higher the wave impedance matching, the higher the energy transfer efficiency after explosive explosion. (3) In the selection of explosives in blasting engineering, three parameters of explosive including density, explosion heat and detonation velocity should be considered; Explosives with a high degree of wave impedance matching and appropriate explosion heat should be selected so that the bulk and small pieces generated after blasting are less.
- iron ore,
- blastability,
- blasting fragmentation,
- fractal dimension,
- wave impedance,
- explosion heat,
- detonation velocity

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References

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