Blasting vibration safety criterion for semi-ellipse-shaped shaft wall

LIU Qiang; SHI Fuqiang; CHI En'an; LIAO Xueyan; TANG Yufeng

doi:10.11883/bzycj-2016-0334

Volume 38 Issue 4

May 2018

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Article Navigation > Explosion And Shock Waves > 2018 > 38(4): 768-776

LIU Qiang, SHI Fuqiang, CHI En'an, LIAO Xueyan, TANG Yufeng. Blasting vibration safety criterion for semi-ellipse-shaped shaft wall[J]. Explosion And Shock Waves, 2018, 38(4): 768-776. doi: 10.11883/bzycj-2016-0334

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LIU Qiang, SHI Fuqiang, CHI En'an, LIAO Xueyan, TANG Yufeng. Blasting vibration safety criterion for semi-ellipse-shaped shaft wall[J]. Explosion And Shock Waves, 2018, 38(4): 768-776. doi: 10.11883/bzycj-2016-0334

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Blasting vibration safety criterion for semi-ellipse-shaped shaft wall

doi: 10.11883/bzycj-2016-0334

1.
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Sichuan Academy of Safety Science and Technology, Chengdu 610045, Sichuan, China
3.
Guizhou Xianlian Blasting Engineering Limited Corp., Guiyang 550002, Guizhou, China

Received Date: 2016-11-01
Rev Recd Date: 2017-04-12
Publish Date: 2018-07-25

Abstract

Abstract

As a major technique for rock breakage, the drill and blast method brings about serious blasting vibration that poses hazards for the structural stability of the shaft wall. In this paper, we simulated the interactive process of the blasting seismic wave and the semi-ellipse-shaped shaft wall using the finite-element numerical software ANSYS/LS-DYNA3D and taking the peak particle velocity (PPV) and the effective tensile stress as the evaluation indexes of the dynamic response. The calculated results indicate that for the shaft walls with different excavation depths there exist similar patterns governing the dynamic response to different maximum charges, and both the peak effective tensile stress and PPV are located at the top arch, whose intensities decrease along with the decrease of the maximum charge. Based on the tensile strength principle and the linear relationship between the peak effective tensile stress and PPV, we established the critical blasting vibration safety criterion as 8 cm/s under the present engineering conditions for this project, and conducted on-site tests which verified the validity of the pre-set criterion.
- safety vibration velocity,
- shaft wall,
- peak particle velocity

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References

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