Stage characteristics of impact pressure of blasthole-walls with different diameters under coupled charge conditions

LOU Xiaoming; CHEN Shiwei; LI Guangbin; NIU Mingyuan; LIN Rizong; YAO Bingjin

doi:10.11883/bzycj-2022-0547

Volume 43 Issue 8

Aug. 2023

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LOU Xiaoming, CHEN Shiwei, LI Guangbin, NIU Mingyuan, LIN Rizong, YAO Bingjin. Stage characteristics of impact pressure of blasthole-walls with different diameters under coupled charge conditions[J]. Explosion And Shock Waves, 2023, 43(8): 085201. doi: 10.11883/bzycj-2022-0547

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Stage characteristics of impact pressure of blasthole-walls with different diameters under coupled charge conditions

doi: 10.11883/bzycj-2022-0547

LOU Xiaoming^{1, 2
,},
CHEN Shiwei^{1, 2
,
,},
LI Guangbin³,
NIU Mingyuan⁴,
LIN Rizong⁴,
YAO Bingjin^{1, 2}

1.
Zijin School of Geology and mining, Fuzhou University, Fuzhou 350116, Fujian, China
2.
Institute of explosion technology, Fuzhou University, Fuzhou 350116, Fujian, China
3.
Wulate Houqi Zijin Mining Co., Ltd., Bayannur 015543, Inner Mongolia, China
4.
Zijin Mining Construction Co., Ltd., Longyan 364299, Fujian, China

Received Date: 2022-12-08
Rev Recd Date: 2023-04-20

Available Online: 2023-04-25

Publish Date: 2023-08-31

Abstract

Abstract

In order to reduce blasting vibration reasonably and determine the damage range of single hole, it is necessary to study the impact pressure changing law of different bore diameters. By analyzing the movement process of the hole wall under the action of detonation, a simplified calculation model for three stages of dynamic expansion of the incompressible fluid, rock-breaking, and dynamic expansion of the hole wall under the action of the explosive shock wave is established, and the time history subsection function of the hole wall pressure in each stage is determined. Based on the ideal gas expansion equation, the theoretical amplification factor of peak pressure on the bore wall is determined, the stage characteristics of bore wall pressure change were mathematically unified, and the impact pressure characteristic curves of impact pressure on the bore wall of blast-hole coupling charge were obtained. Based on LS-DYNA numerical simulation software and field industrial model test, the calculation model results were compared and validated by numerical analysis and super-dynamic strain test model test. The impact pressure curves of five different pore diameters (51−200 mm) under the coupled charge condition were obtained, and the theoretical amplification coefficient of the peak pore pressure was verified by experiments. The theoretical model error is controlled between 0.7% and 6.4%. The comparison and analysis of theoretical calculation, historical point of numerical analysis, and measured point data of model test under two specific conditions of 76 and 90 mm show that the theoretical piecewise function can effectively fit the data of numerical analysis and model test. The error of peak pressure is 6.8% and 4.9%, and that of time is 7.6% and 4.8%, respectively.
- coupling charge,
- hole diameter,
- mechanical model,
- bore wall pressure,
- model test

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References(19)

References

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