Analysis of acoustic wave frequency spectrum characters of rock mass under blasting damage based on wavelet(packet) transformation

作者：Yan, Changbin^*; Wang, Guijun; Shi, Shouliang; Xu, Guoyuan

来源：Chinese Journal of Rock Mechanics and Engineering, 2010, 29(7): 1496-1502.

• Acoustic measurements
• Acoustic signals
• Energy attenuation
• Energy concentration
• Frequency spectra
• Transformation methods
• Underground engineering
• Wavelet(packet) transformation

The blasting damage of rock mass results in the change of energy attenuation and its frequency spectrum, besides influences on the acoustic velocity. In order to make the best of the plentiful information taken by the acoustic signals of rock mass and remedy the shortage of simple acoustic velocity analysis, the research on the rock mass damage under simulative blasting with little charge for ten times by acoustic measurement in the surrounding rock of some underground engineering is carried out. And the acoustic wave frequency spectrum characters are decomposed to be analyzed with the wavelet(packet) transformation methods, in view of the deficiency of Fourier analysis. Research results show that the variety law of rock mass acoustic wave frequency spectrum obtained by wavelet(packet) transformation is more obvious after blasting. The amplitudes and power spectral density of wavelet components with 2-4, 2-5 and 2-6 scale are far higher than those with other scales; and these wavelet components are more sensitive to the blasting damage of rock mass. The acoustic signals of frequency corresponding to the energy concentration area and the distribution percentage of most energy turn to lower as the result of the blasting damage of rock mass. The obtained research results will provide an important reference to reveal the internal relations of the blasting damage of rock mass and the acoustic signals frequency spectrum characters.

• 出版日期2010-7
• 单位华南理工大学