Frequency and duration dependence analysis of structural blasting vibration response

LIU Yijia; LU Wenbo; CHEN Ming; YAN Peng

doi:10.11883/bzycj-2019-0142

Volume 39 Issue 8

Aug. 2019

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LIU Yijia, LU Wenbo, CHEN Ming, YAN Peng. Frequency and duration dependence analysis of structural blasting vibration response[J]. Explosion And Shock Waves, 2019, 39(8): 085203. doi: 10.11883/bzycj-2019-0142

Citation:

LIU Yijia, LU Wenbo, CHEN Ming, YAN Peng. Frequency and duration dependence analysis of structural blasting vibration response[J]. Explosion And Shock Waves, 2019, 39(8): 085203. doi: 10.11883/bzycj-2019-0142

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Frequency and duration dependence analysis of structural blasting vibration response

doi: 10.11883/bzycj-2019-0142

LIU Yijia^{1, 2
,},
LU Wenbo^{1, 2
,
,},
CHEN Ming^{1, 2},
YAN Peng^{1, 2}

1.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, China
2.
Ministry of Education Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Wuhan University, Wuhan 430072, Hubei, China

Received Date: 2019-04-22
Rev Recd Date: 2019-05-28

Available Online: 2019-07-25

Publish Date: 2019-08-01

Abstract

Abstract

It is helpful to blasting parameter design and blasting vibration safety evaluation to make clear the dependence of blasting vibration response on frequency and duration. The relationship between single-delay blasting vibration, multi-delay blasting vibration and single-degree-of-freedom system response is derived from the frequency domain. The influence of blasting vibration frequency and duration on the vibration response of structure is analyzed by taking the delay time and the number of blasting stages as the link. Finally, a set of measured test data is used to verify. The results show that under the delay time ∆τ, the multi-delay blasting vibration has a frequency band phenomenon of 1/∆τ. The frequency component is concentrated to the dominant frequency ${f_{\rm{i}}} = n/\Delta \tau \left( {n \in {Z^ + }} \right)$, and as the number of segments increases, the dominant frequency amplitude increases. The structure produces a large vibration response when the dominant frequency component in blasting vibration is close to the natural frequency f_n of the structure. Therefore, the delay time should be selected to ensure that the resonance of the structure is not caused at the dominant frequency of n/∆τ. In the response spectrum, the structural amplification factor of multi-delay blasting vibration is larger than that of a single-delay when frequency near its multiple dominant frequencies f_i, which is basically consistent with the single-delay at the rest. In particular, when the dominant frequency f_i, the single delay blasting vibration frequency f_m, and the structure natural vibration frequency f_n are similar, the structure may produce the maximum response. The increase of the number of blasting sections increases the duration of blasting vibration when the sections within a certain range. After increasing to a certain value, the structural response has little relationship with the duration.
- multi-delay,
- single-degree-of freedom systems,
- delay time,
- response spectrum

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References(24)

References

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