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《Journal of Safety and Environment》 2002-04
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A PROBE ON DETRIMENTAL EVALUATION OF BLAST VIBRATION BASED ON WAVELET PACKETS ANALYSIS

SONG Guang ming & ZENG Xin wu (Department of Applied Physics, College of Science, National University of Defense Technology, Changsha 410073, China) CHEN Shou ru (College of Resource Environment and Civil Engineering, Central South University, C  
The present paper intends to make a discussion on the different harm effects of the detailed signals in the different Dominant Frequency Bands through wavelet packets analysis, based on the criteria of Peak Particle Velocity deduced from studies in hope to reduce the actual status of blasting vibration damage. Furthermore, the study cases on the slopes of Tongshankou Copper Mine, Gushan Iron Mine and Hainan Iron Mine justified the above mentioned conclusion. The safety criteria of the Peak Particle Velocity in view of the Dominant Frequency are some supplementary and consummate to the criteria of unitary Peak Particle Velocity. Nevertheless, this kind of Dominant Frequency can be deduced only from the frequency spectrum analysis based on the Fast Fourier Transform (FFT), which is actually not characteristic of the property of multiple Dominant Frequency Band for its intrinsic limitation and failure to work out the reliable time duration in conformity with the Dominant Frequency. However, since the wavelet packets analysis can help to overcome the above mentioned limitation with FFT spectrum analysis and decompose the original signals into the detailed ones with different frequency bandwidths, the decomposition should be the basis of the above mentioned evaluation. The detailed signal waveforms deduced from the said decomposition and reconstruction may represent the vibration time duration series in the different scopes of the Dominant Frequency Band. Therefore, the harm evaluation method based on the wavelet packets analysis can particularly involve all the accounts into the effect of the different Dominant Frequencies on the decision of the evaluation criterion with regard to the value of the detailed signal waveform amplitudes for the measurement of peak amplitude vibration in situs.
【Fund】: 国家自然科学基金资助项目 (编号 :40 0 740 2 5)
【CateGory Index】: X932
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