Influence of Distance from Blast Center on Time-Frequency Characteristics of Blast Vibration Signals

Abstract:

The distance from the blast center will directly change the blasting seismic wave wave’s energy property and eventually influence the structure’s response to the wave. To study its influence on the time-frequency (t-f) characteristics of blasting vibration signals, the single-hole blasting vibration test was conducted in Jinduicheng Open Pit Mine. Based on the measured data, wavelet analysis was used to decompose the measured signals, and signal segments at different frequency bands were got. RSPWVD quadratic form time-frequency analysis method was applied to analyze the segments’ t-f characteristics, and the domain frequencies of the blasting seismic waves under different distances from the blast center and the energy distribution and duration of the frequency bands were collected. The results show that the distance from the blasting center has a big impact on the domain frequency of the blasting seismic wave. With the increasing of the distance, the domain frequency reduces, its duration extends, the percentage of energy at the low frequency in the total energy increases and the duration of the frequency band extends. The research results provide the analysis base for understanding the influence of the distance from the blast center on signals’ t-f characteristic and studying vibration resistance and vibration reduction.

• Periodical: Advanced Materials Research (Volumes 1033-1034)
• Pages: 444-448
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.444
• Online since: October 2014
• Authors: Ming Sheng Zhao, Xu Guang Wang*, En An Chi, Qiang Kang
• Keywords: Blast Vibration, Distance from the Blast Center, Energy Characteristics, Time-Frequency Characteristics

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