ANALYSIS OF ACOUSTIC WAVE FREQUENCY SPECTRUM CHARACTERS OF ROCK MASS UNDER BLASTING DAMAGE BASED ON WAVELET(PACKET) TRANSFORMATION
YAN Changbin1，WANG Guijun1，SHI Shouliang1，XU Guoyuan2
(1. Yellow River Engineering Consulting Co.，Ltd.，Zhengzhou，Henan 450003，China； 2. School of Civil and Transportation，South China University of Technology，Guangzhou，Guangdong 510641，China)
Abstract：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.
闫长斌，王贵军，石守亮，徐国元. 岩体爆破损伤声波测试信号频谱特征的小波(包)分析[J]. 岩石力学与工程学报, 2010, 29(07): 1496-1502.
YAN Changbin1，WANG Guijun1，SHI Shouliang1，XU Guoyuan2. ANALYSIS OF ACOUSTIC WAVE FREQUENCY SPECTRUM CHARACTERS OF ROCK MASS UNDER BLASTING DAMAGE BASED ON WAVELET(PACKET) TRANSFORMATION. , 2010, 29(07): 1496-1502.
