Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (7): 2497-2506.doi: 10.16285/j.rsm.2018.0584

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Spectral characteristics of AE in the process of saturated granite fracture under uniaxial compression

ZHANG Yan-bo1, 2, LIANG Peng1, 2, SUN Lin1, 2, TIAN Bao-zhu1, 2, YAO Xu-long1 ,2, LIU Xiang-xin1, 2   

  1. 1. School of Mining Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, China; 2. Key Laboratory of Mining and Safety Technology of Hebei Province, North China University of Science and Technology, Tangshan, Hebei 063210, China
  • Received:2018-04-09 Online:2019-07-11 Published:2019-07-06
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51574102, 51774138), the Natural Science Foundation of Hebei Province (E2017209241) and the Supporting Plan for 100 Excellent Innovative Talents in Colleges and Universities of Hebei Education Department(SLRC2017050).

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Abstract: In this study, acoustic emission (AE) experiments were carried out on saturated granite under uniaxial compression. Fast Fourier transform (FFT) was used to extract the spectrum parameters of AE signals such as dominant-frequency and secondary dominant-frequency. Furthermore, the ratio of the dominant-frequency to secondary dominant-frequency (F) was proposed to characterize the spectral characteristics of the AE signal and study the characteristics of AE spectrum in rock fracture process. The results show that the numbers of the dominant-frequency and secondary dominant-frequency bands of AE increase first and then decrease in the rupture process of saturated granite. Compared with the characteristics of the dominant-frequency distribution, the proportion of the low-frequency interval of the secondary dominant-frequency reduces, and the proportion of the middle and high-frequency interval increases. In addition, the total average value of the secondary dominant-frequency is about 5 kHz higher than that of the dominant-frequency. The distribution range of the dominant-frequency ratio (F) reaches the maximum at the elastic stage: 0

Key words: rock mechanic, AE, spectral characteristics, dominant-frequency, secondary dominant-frequency

CLC Number: 

  • TU 45
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