The Spatial and Temporal Distribution of Rock Breaking Effect of Explosion Stress Wave of Slotted Cartridge
American Journal of Mechanical and Industrial Engineering
Volume 4, Issue 5, September 2019, Pages: 76-85
Received: Sep. 19, 2019;
Accepted: Sep. 29, 2019;
Published: Nov. 6, 2019
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Yanbing Wang, School of Mechanics and Architecture Engineering, China Universityof Mining and Technology (Beijing), Beijing, China; State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing, China
Bingbing Yu, School of Mechanics and Architecture Engineering, China Universityof Mining and Technology (Beijing), Beijing, China
Ji Kong, School of Mechanics and Architecture Engineering, China Universityof Mining and Technology (Beijing), Beijing, China
Maike Wang, School of Mechanics and Architecture Engineering, China Universityof Mining and Technology (Beijing), Beijing, China
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The propagation characteristics and rock breaking mechanism of explosive stress wave have aroused the interests of many researchers. This work proposed a method that separates the explosion stress wave from detonation gas and designed the testing unit accordingly. It combined the resistance ultra-dynamic strain test to conduct the strain measurement on local key points and obtained the strain waveforms of representative measuring points under the explosion stress wave. The characteristics of these strain waveforms were analyzed and the energy-based spectral analysis of these waveforms was done using Matlab. Findings show that both strain peak and stress rate peak are the biggest along the slot direction, followed by that along the non-slot direction, 135° direction and 45° direction in a descending order; the similar low-frequency band was detected at the measuring point with the same distance to the explosion source, while the high-frequency band was unevenly distributed. In the rock breaking experiment under the stress wave of slotted cartridge, with regards to the measuring points at the same distance to borehole, the similar low-frequency bands appeared and concentrated in 292.8-448Hz. The included angle between each measuring point and the slot was different, which impacted the propagation of stress wave to some extent and resulted in uneven distribution of the high-frequency bands.
Slotted Cartridge, Explosion, Stress Wave, Spectral Analysis
To cite this article
The Spatial and Temporal Distribution of Rock Breaking Effect of Explosion Stress Wave of Slotted Cartridge, American Journal of Mechanical and Industrial Engineering.
Vol. 4, No. 5,
2019, pp. 76-85.
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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