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Spectral prediction and control of blast vibrations during the excavation of high dam abutment slopes with millisecond-delay blasting

Li, P. / Lu, W.B. / Wu, X.X. / Chen, M. / Yan, P. / Hu, Y.G.

AbstractIn hydropower projects in Southwest China, large-scale, high-intensity blasts are required to excavate high rock slopes. In these cases, traditional prediction and control methods for blast vibrations are invalid. Thus, a method to predict the time history of blast vibrations on high slopes is proposed, and a blast vibration spectral control scheme based on this method is presented. Additionally, a case study for the abutment slope excavation of the Xiluodu hydropower project is presented. The results indicate that if the delay interval is <20ms or >50ms, a large amount of energy is distributed in the resonant frequency band of the slope; with optimized delay interval of 20–25ms and 45–50ms, the low-frequency compositions of blast vibrations are considerably fewer, and spectral control can be implemented more effectively. Delay intervals of 25 and 50ms are adopted in practice considering the detonator limitation.

Highlights•Spectral prediction combining the measured seed waves and the DFEM•Spectral control of vibrations on high slopes with the structural vibration factor•Blast design optimization for abutment excavation of the Xiluodu hydropower project

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Spectral prediction and control of blast vibrations during the excavation of high dam abutment slopes with millisecond-delay blasting

Li, P. / Lu, W.B. / Wu, X.X. / Chen, M. / Yan, P. / Hu, Y.G.

AbstractIn hydropower projects in Southwest China, large-scale, high-intensity blasts are required to excavate high rock slopes. In these cases, traditional prediction and control methods for blast vibrations are invalid. Thus, a method to predict the time history of blast vibrations on high slopes is proposed, and a blast vibration spectral control scheme based on this method is presented. Additionally, a case study for the abutment slope excavation of the Xiluodu hydropower project is presented. The results indicate that if the delay interval is <20ms or >50ms, a large amount of energy is distributed in the resonant frequency band of the slope; with optimized delay interval of 20–25ms and 45–50ms, the low-frequency compositions of blast vibrations are considerably fewer, and spectral control can be implemented more effectively. Delay intervals of 25 and 50ms are adopted in practice considering the detonator limitation.

Highlights•Spectral prediction combining the measured seed waves and the DFEM•Spectral control of vibrations on high slopes with the structural vibration factor•Blast design optimization for abutment excavation of the Xiluodu hydropower project

Spectral prediction and control of blast vibrations during the excavation of high dam abutment slopes with millisecond-delay blasting

Li, P. / Lu, W.B. / Wu, X.X. / Chen, M. / Yan, P. / Hu, Y.G.

AbstractIn hydropower projects in Southwest China, large-scale, high-intensity blasts are required to excavate high rock slopes. In these cases, traditional prediction and control methods for blast vibrations are invalid. Thus, a method to predict the time history of blast vibrations on high slopes is proposed, and a blast vibration spectral control scheme based on this method is presented. Additionally, a case study for the abutment slope excavation of the Xiluodu hydropower project is presented. The results indicate that if the delay interval is <20ms or >50ms, a large amount of energy is distributed in the resonant frequency band of the slope; with optimized delay interval of 20–25ms and 45–50ms, the low-frequency compositions of blast vibrations are considerably fewer, and spectral control can be implemented more effectively. Delay intervals of 25 and 50ms are adopted in practice considering the detonator limitation.

Highlights•Spectral prediction combining the measured seed waves and the DFEM•Spectral control of vibrations on high slopes with the structural vibration factor•Blast design optimization for abutment excavation of the Xiluodu hydropower project

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Order at Subito €

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Title:

Spectral prediction and control of blast vibrations during the excavation of high dam abutment slopes with millisecond-delay blasting

Contributors:

Li, P. (author) / Lu, W.B. (author) / Wu, X.X. (author) / Chen, M. (author) / Yan, P. (author) / Hu, Y.G. (author)

Published in:

Soil Dynamics and Earthquake Engineering ; 94 ; 116-124

Publication date:

2017-01-09

Size:

9 pages

ISSN:

DOI:

https://doi.org/10.1016/j.soildyn.2017.01.007

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

High slope , Dam abutment , Blasting vibration , Prediction , Spectral control

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