High-speed photography image acquisition system in tunnel blasting and parameters study  on precisely controlled blasting

GONG Min; WU Haojun

doi:10.11883/bzycj-2018-0319

Volume 39 Issue 5

May 2019

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GONG Min, WU Haojun. High-speed photography image acquisition system in tunnel blasting and parameters study on precisely controlled blasting[J]. Explosion And Shock Waves, 2019, 39(5): 051101. doi: 10.11883/bzycj-2018-0319

Citation:

GONG Min, WU Haojun. High-speed photography image acquisition system in tunnel blasting and parameters study on precisely controlled blasting[J]. Explosion And Shock Waves, 2019, 39(5): 051101. doi: 10.11883/bzycj-2018-0319

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High-speed photography image acquisition system in tunnel blasting and parameters study on precisely controlled blasting

doi: 10.11883/bzycj-2018-0319

GONG Min,
WU Haojun

School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2018-08-29
Rev Recd Date: 2018-10-24
Publish Date: 2019-05-01

Abstract

Abstract

Parameter design of precise controlled blasting in urban tunnels is crucial, which needs the high-speed photography image acquisition and study on the dynamic failure process of rock on field. However, it has not been studied in-depth in the past due to restrict of many factors, the factors include protection of the camera and the bad environment. Based on the technical problems tests on field are solved in a tunnel in Chongqing, China. Original data that include the images of the complete blasting process in tunnel and the blasting vibration data are collected simultaneously, which is the basis for analyzing the phenomenon of rock burst during blasting. 15−18 ms after initiation, the rock masses begin to move and caves are expanded continuously while the rock masses are thrown at about 21 ms. The blast effects is much better if the millisecond delay time between two blast-holes sets 8−50 ms, which can balance the contradiction between two blasting effects, one is the blasting synergetic effect between a pair of cutting holes, and the other is vibration reduction effects of millisecond blasting. The second free face is formed at 54 ms by analyzing the characteristics of crack propagation curves combined with field-measured vibration data. The method is more accurate than the time determined by past methods. Based on this, the optimized on-field delay design of detonators was carried out and got good vibration reduction results. The results can serve as a reference for precise controlled blasting of tunnel in the future.
- tunnel blasting,
- high-speed photography method,
- millisecond blasting,
- vibration control,
- rock failure process

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References(15)

References

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