Version 1
: Received: 20 March 2024 / Approved: 20 March 2024 / Online: 20 March 2024 (10:19:04 CET)
How to cite:
Zhao, J.; Chen, H. Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions. Preprints2024, 2024031195. https://doi.org/10.20944/preprints202403.1195.v1
Zhao, J.; Chen, H. Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions. Preprints 2024, 2024031195. https://doi.org/10.20944/preprints202403.1195.v1
Zhao, J.; Chen, H. Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions. Preprints2024, 2024031195. https://doi.org/10.20944/preprints202403.1195.v1
APA Style
Zhao, J., & Chen, H. (2024). Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions. Preprints. https://doi.org/10.20944/preprints202403.1195.v1
Chicago/Turabian Style
Zhao, J. and Hui Chen. 2024 "Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions" Preprints. https://doi.org/10.20944/preprints202403.1195.v1
Abstract
The degree of ore rock fragmentation of mine blasting is an important index for evaluating the effect of engineering blasting. In order to study the effect of millisecond delayed blasting on the internal fragmentation of the ore rock, LS-DYNA numerical simulation software was used to obtain the damage characteristics of the ore rock in the blasting area using the RHT model. The Mohr-Coulomb strength damage criterion was applied to analyze the internal stress state of the ore rock, and the effects of 25ms, 50ms and 75ms delay time conditions on ore rock fragmentation were studied. The results show that, within a certain range of delay time, the degree of rock fragmentation increases with the increase of delay time. The stress state in the ore rock due to blasting is strengthened with the increase of delay time in the direction of the blast hole, which shows that the stress concentration is strengthened from the excavation face to the interior of the ore rock. The damage and the degree of fragmentation show a characteristic relationship of 25ms＜50ms＜75ms, which is verified by carrying out blasting experiments on site.
Keywords
Electronic detonator; RHT model; precision delay; Rock damage; Mohr-Coulomb criterion
Subject
Engineering, Mining and Mineral Processing
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
