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| Study on local and minutiae characteristics of excitation signals at perilous rock rupture |
| CHEN Hong-kai1, 2, YANG Ming1, TANG Hong-mei2, HE Xiao-ying2, WANG Zhi2 |
| 1. College of Hydraulic & environmental engineering, China Three Gorges University, Yichang, Hubei, 443002, China2. Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing, 400074, China |
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Abstract As one of emergency geological disasters, perilous rock will release abruptly energy at rupture. The energy pass into perilous rock blocks near the rupture position in excitation wave, and decreases stability of perilous rocks near the rupture position. By the de-noising processing in wavelet methods to excitation signals gathered in model test of falling perilous rock rupture in laboratory, this paper takes the signals during 10 ms duration from the 25 ms to 35 ms in model test as the essential data to analyze local and minutiae characteristics of excitation signals at perilous rock rupture. Under the experimental conditions, analysis results show that, local characteristics of excitation signals at perilous rock rupture has certain periodicity, i.e., 8 or 9 excitation peaks with 1.0~1.4 ms periodicity in horizontal direction, while 3 or 4 excitation peaks with 2.2~3.0 ms periodicity in vertical direction. The distance between measuring point and the rupture position significantly impacts the amplitude of excitation peaks, the closer the distance, the bigger the amplitude. Furthermore, the integrity of interface between two perilous rock blocks has a significant impact on frequency and amplitude of excitation peaks, for example, when the excitation signal pass into incomplete interface the peaks of excitation signal are lagged a little, about 10ms under the experiment. Specially, almost all local and minutiae characteristics of excitation signals at perilous rock rupture can be embodied by minutiae coefficient, and the main frequency of excitation signals appear in minutiae characteristics from d3 to d7. Achievements in the paper are valuable in implementation of similar model test of excitation effect at perilous rock rupture.
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Received: 15 August 2013
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2014, Vol. 33 
