A study on the variation of cavity volume and energy dissipation with resistance line under blast impact load
LEI Zhen1，HUANG Yonghui2，CHEN Wenmeng2，ZHANG Zhiyu3，ZHOU Jiguo3
1.Institute of Mining Engineering, Guizhou Institute of Technology, Guiyang 550003, China;
2.Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China;
3.Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
In view of the problems of the shock load volume and energy consumption proportion around rock mass media under the impact load of a columnar cartridge, a simple calculation formula for rock crushing energy consumption in the excessive crushing zone was built based on uniaxial dynamic compressive force, with the theory of blasting rock and fracture mechanics and some extreme characteristics of the explosion, such as instantaneous, high temperature, and high pressure.And then a model test study was carried out.The results show that: with the minimum resistance line increased from 120 mm to 200 mm, the cavity radius increased from 2.6 times to 4.6 times of the hole radius, and the cavity volume increased by 3.56 times, which presented an obvious exponential growth trend.The energy consumption increased from 524 J to 1 870 J, and the proportion of energy consumption increased from 5.93% to 21.13%, which was basically consistent with the existing research results and these results verified the feasibility of the calculation formula.The research results in this work can provide theoretical basis for the design and construction of smooth blasting, pre-splitting blasting and controlled blasting.
雷振1，黄永辉2，陈文梦2，张智宇3，周继国3. 爆炸冲击荷载下扩腔体积和能耗随抵抗线的变化规律研究[J]. 振动与冲击, 2021, 40(4): 66-71.
LEI Zhen1，HUANG Yonghui2，CHEN Wenmeng2，ZHANG Zhiyu3，ZHOU Jiguo3. A study on the variation of cavity volume and energy dissipation with resistance line under blast impact load. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(4): 66-71.
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