Experiment on Different Length/Diameter Ratio Charge Explosive Strain Wave Propagation in Rock

Abstract:

In order to explore the blasting effect with charged by different length/diameter ratio in rock, adopted ultra-dynamic strain testing system to test the blasting strain wave with charged by little amount of explosives and different length/diameter in the rock models. Analyzed the radial blasting strain wave signal in the medium under the conditions of coupling charging explosive loading, got the generalities and difference of the explosive strain waveform features with charged by different length/diameter ratio, and relationship of peak strain with the relative distance. The results show that peak strain was greatly affected by the change of length/diameter ratio and charge mass in the area of close blasting source, when the relative distance is more than 45, the influence is less. Made the length/diameter ratio is 20 to be the boundary, when the length/diameter ratio is greater than 20, the peak strain attenuated slowly. The explosive energy of the big length/diameter ratio is relatively decentralized to the medium, improved the energy utilization ratio of explosives. The measured results provided a new experimental basis to further understand correctly the rock blasting mechanism.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 343-347
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.343
• Online since: May 2012
• Authors: Ren Shu Yang, Xiang Tao Gao, Yu Long Che
• Keywords: Blasting Strain Wave, High Strain Rate, Length/Diameter Ratio, Rock Blasting Mechanism, Ultra Dynamic

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