Study on frequency domain characteristics of excitation signals at rupture of perilous rock

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (19) : 64-68.

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Study on frequency domain characteristics of excitation signals at rupture of perilous rock

CHEN Hong-kai1, 2, TANG Hong-mei1, Wang Zhi1, HE Xiaoying1

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Abstract

The excitation effect of perilous rocks is one of main impact factors to induce the chain damage of unstable aggregation rock blocks. Paying attention to the falling perilous rock, a physical model to probe the excitation effect at rupture of perilous rock is established in laboratory, and the model tests are operated. The test results show that, firstly, the effectiveness of excitation signals can be differentiated with the coherent coefficient analysis method, and almost all of the measured excitation signals at rupture of perilous rock distribute at a3 (0~1250Hz) frequency range. Secondly, the acceleration-schedule curve for each decomposition coefficient excitation signal can be gotten by db8 (3 layers）wavelet analysis method, and the spectrum figures are obtained by the Fourier transformation. Thirdly, on a macro level, the excitation signal presents an attenuation trend with three peaks at 900Hz, 1100Hz and 1500Hz, respectively. The larger the distance between the measuring point and the rupture position of perilous rock, the bigger the excitation acceleration, and the excitation acceleration at vertical direction is bigger than that at level direction. Fourthly, the favorable integrality of interface between two perilous rocks is easy to traverse for excitation signals, and numerical decrement at vertical direction is higher than that at level direction. Achievements in the paper are valuable in discoursing on the damage mechanism of massive perilous rocks.

Key words

rock mechanics / frequency domain characteristics / excitation signal / rupture of perilous rocks / model test

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CHEN Hong-kai;;TANG Hong-mei;Wang Zhi;HE Xiaoying. Study on frequency domain characteristics of excitation signals at rupture of perilous rock[J]. Journal of Vibration and Shock, 2014, 33(19): 64-68