Millisecond time for reducing vibration between two holes for slope blasting determined by stability coefficient of time history

ZHOU Wenhai; LIANG Rui; CHEN Jinlin; ZHU Mian; CHEN Penghui; LOU Xiaoming; WANG Dunfan

doi:10.11883/bzycj-2018-0337

Volume 39 Issue 8

Aug. 2019

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ZHOU Wenhai, LIANG Rui, CHEN Jinlin, ZHU Mian, CHEN Penghui, LOU Xiaoming, WANG Dunfan. Millisecond time for reducing vibration between two holes for slope blasting determined by stability coefficient of time history[J]. Explosion And Shock Waves, 2019, 39(8): 085202. doi: 10.11883/bzycj-2018-0337

Citation:

ZHOU Wenhai, LIANG Rui, CHEN Jinlin, ZHU Mian, CHEN Penghui, LOU Xiaoming, WANG Dunfan. Millisecond time for reducing vibration between two holes for slope blasting determined by stability coefficient of time history[J]. Explosion And Shock Waves, 2019, 39(8): 085202. doi: 10.11883/bzycj-2018-0337

Citation:

ZHOU Wenhai, LIANG Rui, CHEN Jinlin, ZHU Mian, CHEN Penghui, LOU Xiaoming, WANG Dunfan. Millisecond time for reducing vibration between two holes for slope blasting determined by stability coefficient of time history[J]. Explosion And Shock Waves, 2019, 39(8): 085202. doi: 10.11883/bzycj-2018-0337

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Millisecond time for reducing vibration between two holes for slope blasting determined by stability coefficient of time history

doi: 10.11883/bzycj-2018-0337

1.
School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
2.
Zijinshan Cuproauride, Zijin Minim Group Co Ltd, Longyan 364200, Fujian, China
3.
Institute for Explosive Technology, Fuzhou University, Fuzhou 350116, Fujian, China
4.
Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China

Received Date: 2018-09-03
Rev Recd Date: 2019-04-07

Available Online: 2019-06-25

Publish Date: 2019-08-01

Abstract

Abstract

In the present study we found out about the optimum millisecond time for reducing vibration in hole-by-hole blasting, on the basis of an actual slope detonation work. At first we constructed a two-dimensional static model using ANSYS and determined the potential sliding surface and the static safety factor in the natural state using finite element reduction. Then we rebuilt the three-dimensional dynamic model of millisecond hole-by-hole blasting and carried out the dynamic analysis using LS-DYAN. In the whole process, we set up three holes in the same row using millisecond detonating by five differential millisecond time control of 0, 17, 25, 42 and 65 ms. At the end of the construction site, we conducted small-scale vibration tests of four millisecond time control in row holes (25 ms, 17 ms), (25 ms, 25 ms), (25 ms, 42 ms), (25 ms, 65 ms), with the stress value of the sliding surface unit during the simultaneous detonation of three holes in the simulated results taken into the formula of limit equilibrium, and drew out the time history curve of slope stability coefficient under impact loading. Analyzing the time history curve, we found that the optimum millisecond time for vibration reduction was 48 ms. Moreover, the results of three-dimensional numerical simulation and vibration test showed that the effect of vibration reduction was better when the millisecond time between holes was 42 ms. The result shows that the millisecond time, given by the slope stability coefficient, is consistent with the simulated and experimental results, which provides a reference for related research on vibration reduction of millisecond hole-by-hole blasting.
- impact load,
- millisecond delay time,
- slope stability,
- safety factor,
- time history analysis

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References(16)

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