Influence of double empty hole spacing on section size of blasting chamber

LI Xianglong; ZHANG Zhiping; WANG Jianguo; LI Qiang; WANG Zichen

doi:10.11883/bzycj-2021-0471

Volume 42 Issue 11

Nov. 2022

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LI Xianglong, ZHANG Zhiping, WANG Jianguo, LI Qiang, WANG Zichen. Influence of double empty hole spacing on section size of blasting chamber[J]. Explosion And Shock Waves, 2022, 42(11): 115201. doi: 10.11883/bzycj-2021-0471

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LI Xianglong, ZHANG Zhiping, WANG Jianguo, LI Qiang, WANG Zichen. Influence of double empty hole spacing on section size of blasting chamber[J]. Explosion And Shock Waves, 2022, 42(11): 115201. doi: 10.11883/bzycj-2021-0471

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Influence of double empty hole spacing on section size of blasting chamber

doi: 10.11883/bzycj-2021-0471

LI Xianglong^{1, 2
,},
ZHANG Zhiping¹,
WANG Jianguo^{1, 2
,
,},
LI Qiang¹,
WANG Zichen³

1.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an, 710077 Shaanxi, China

Received Date: 2021-11-11
Rev Recd Date: 2022-04-21

Available Online: 2022-05-05

Publish Date: 2022-11-18

Abstract

Abstract

In order to explore the influence of double empty hole spacing on the tunnel excavation blasting effect, the range of empty hole spacing is calculated according to the compensation space theory and the theoretical formula of hole deviation. A finite element numerical model of a roadway of Dahongshan Copper Mine is established based on the HJC constitutive model of concrete and multi-material ALE algorithm of LS-DYNA. By adding the *MAT_ADD_EROSION keyword, the damaged rock elements are observed, and the cross-section area of the cavity for cut blasting with large-diameter double empty holes of different spacing is calculated. The results show that when the hole spacing d_v is 15, 25, 35, 45 and 55 cm, the cavity section area is 0.1641, 0.2116, 0.2436, 0.1740 and 0.0951 m², respectively. When the hole spacing increased by 10 cm each from 15 cm to 55 cm, the cavity section area increased by 18.94% and 15.1% and decreased by 17.8% and 45.3%, respectively. Thus, with the increase of empty hole spacing, the section area increases first and then decreases. When d_v = 35 cm, it reaches its maximum. This case was tested in the field. The width, height, and area of the cavity section measured by the No. 2 field test are 4.0%, 3.4%, and 4.98%, respectively, smaller than the simulation results. The error between multiple tests and simulation results is within 5%, indicating that the test results are in good agreement with the simulation results, which can provide data reference for the construction of a numerical method for predicting the cavity volume of underground tunnel cutting blasting.
- cutting blasting,
- numerical simulation,
- empty hole spacing,
- empty hole effect,
- groove cavity section

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References(21)

References

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