Influence of free surface on energy distribution characteristics of blasting vibration

Wu Congshi; Xu Rongwen; Zhang Qingbin

doi:10.11883/1001-1455(2017)06-0907-08

Volume 37 Issue 6

Sep. 2017

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Wu Congshi, Xu Rongwen, Zhang Qingbin. Influence of free surface on energy distribution characteristics of blasting vibration[J]. Explosion And Shock Waves, 2017, 37(6): 907-914. doi: 10.11883/1001-1455(2017)06-0907-08

Citation:

Wu Congshi, Xu Rongwen, Zhang Qingbin. Influence of free surface on energy distribution characteristics of blasting vibration[J]. Explosion And Shock Waves, 2017, 37(6): 907-914. doi: 10.11883/1001-1455(2017)06-0907-08

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Influence of free surface on energy distribution characteristics of blasting vibration

doi: 10.11883/1001-1455(2017)06-0907-08

1.
College of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410114, Hunan, China
2.
Gansu Province Transportation Planning, Survey & Design Institute Co.Ltd, Lanzhou 730030, Gansu, China

Received Date: 2016-04-27
Rev Recd Date: 2016-08-30
Publish Date: 2017-11-25

Abstract

Abstract

In combination with the measured data of the blasting vibration, the total energy, the frequency band energy, and the PPV of each band of the blasting vibration signal with different numbers of free surfaces were obtained using the wavelet analysis. Then the energy distribution characteristics of the blasting vibration signal with different numbers of free surfaces were studied. The results show that the slotted blasting or cut blasting is restricted by a single free surface, thus most of the energy of the explosion will be consumed as seismic energy; the greater the number of free surfaces, the less the total energy of the blasting vibration signal; with the increase of the of free surfaces, the distribution of the vibration components of each frequency band can be affected, which makes the blasting vibration energy more tend to be the high frequency distribution, so that the energy in the middle and low frequency can be reduced, and the vibration velocity is reduced as well; the PPV of the high frequency band is higher than that of the low frequency band, but the duration of the vibration is shorter, and the energy attenuation is faster in the same vibration signal. It is suggested that, in the design of reducing the blasting vibration, it is more effective to optimize the initiation scheme by using as many free surfaces as possible than by merely reducing the single segment of detonating charge.
- slotted blasting,
- free surface,
- blasting vibration,
- wavelet analysis,
- energy of each band,
- peak particle velocity of blasting vibration(PPV)

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References(16)

References

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