Research and application of root smooth blasting mechanism of shaped charge in spiral tube

被引：0
|
作者：
Deng Y. [1 ]
Zhang Z. [2 ]
Guan Z. [2 ]
Yang Z. [2 ]
Ma H. [1 ,3 ]
Shen Z. [1 ]
机构：
[1] CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui
[2] Darch Construction Group CO., LTD., Zhoushan, 316021, Zhejiang
[3] State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, Anhui
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2020年 / 40卷 / 01期
关键词：
Deep borehole blasting; Radial jet; Root bottom of blasting; Root smooth blasting; Spiral tube shaped charge;
D O I：
10.11883/bzycj-2018-0495
中图分类号：
学科分类号：
摘要：
Aiming at the unevenness of the root bottom and the low power capacity of the explosive in the present stage of smooth blasting, a kind of spiral tube shaped charge was put forward. In order to explore the rock-breaking mechanism of the charge, LS-DYNA numerical simulation and borehole blasting test were used to study the rock-breaking mechanism of the charge. Firstly, the numerical simulation results show that the spiral pipe shaped charge can form a continuous metal jet penetrating the borehole wall, and the borehole wall was penetrated out of the crack in the direction of the vertical borehole. The results show that there are helical perforation cracks in the borehole wall of the residual sample of spiral tube, which confirmed the penetration results of numerical simulation. In addition, the perforation utilization rate and reaming rate were increased by 7.2% and 8.4%, respectively, compared with the normal columnar charge. Finally, this charge was applied to the reclamation area of Zhoushan. The results showed that the average root height of the spiral pipe charge blasting area was 14 cm lower than that of the common charge, and the standard deviation of the root height was 12 cm less than that of the common charge, that is, the cumulative charge saved 14 cm hole depth and charge length and reduced the roughness of 12 cm. The research results are of great value in the application of blasting engineering, which can reduce the construction cost, speed up the construction progress and improve the blasting effect. © 2020, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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