Experimental Study on Blasting Energy Distribution and Utilization Efficiency Using Water Jet Test

Chenxi Ding, Renshu Yang, Zhen Lei, Cheng Chen and Changda Zheng
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Chenxi Ding: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Renshu Yang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Zhen Lei: Institute of Mining Engineering, Guizhou Institute of Technology, Guizhou 550003, China
Cheng Chen: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Changda Zheng: State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

Energies, 2020, vol. 13, issue 20, 1-9

Abstract: The blasting stress wave and blasting gas generated by explosive blasting are the two main motive powers of rock fragmentation. An experimental method based on water jet test is used to study the energy distribution ratio of blasting stress wave and blasting gas; the utilization efficiency of blasting energy under different borehole constraint conditions is also analyzed. It proves that the blasting stress wave does not cause the water jet, and the blasting gas is the only power of the water column jet. The results show that the energy of the blasting gas and blasting stress wave respectively account for about 64% and 36% of the total energy generated by the explosion of lead azide. The utilization efficiency of the blasting gas energy under strong, medium, and weak constraint conditions is 100%, 80%, and 52%, respectively. The borehole constraint condition is crucial for the effective utilization of blasting energy.

Keywords: blasting stress wave; blasting gas; water jet; borehole constraint; utilization efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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