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Acoustic emission characteristics of rock under impact loading

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Abstract

Acoustic emission tests were performed using a split Hopkinson pressure bar system (SHPB) on 50-mm-diameter bars of granite, limestone, sandstone and skarn. The results show that the amplitude distribution of hits is not well centralized around 50 dB, and that some hits with large amplitudes, usually larger than 70 dB, occur in the early stages of each test, which is different from the findings from static and low-loading-rate tests. Furthermore, the dominant frequency range of the recorded acoustic emission waveforms is between 300 kHz and 500 kHz, and frequency components higher than 500 kHz are not significant. The hit with the largest values of amplitude, counts, signal strength, and absolute energy in each test, displays a waveform with similar frequency characteristics and greater correlation with the waveform obtained from the elastic input bar of the split Hopkinson pressure bar system compared with the waveforms of the other hits. This indicates that the hit with the largest values of amplitude, counts, signal strength, and absolute energy is generated by elastic wave propagation instead of fracture within the rock specimen.

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    **-ling Liu  (刘希灵), **-bing Li  (**夕兵), Tu-bing Yin  (尹土兵) & Meng Rao  (饶蒙)

  2. Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver, V6T1Z4, Canada

    **-ling Liu  (刘希灵)

  3. School of Civil Engineering, Hunan City University, Yiyang, 413049, China

    Liang Hong  (洪亮)

Authors
  1. **-ling Liu  (刘希灵)
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  2. **-bing Li  (**夕兵)
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  3. Liang Hong  (洪亮)
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  4. Tu-bing Yin  (尹土兵)
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  5. Meng Rao  (饶蒙)
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Correspondence to **-ling Liu  (刘希灵).

Additional information

Foundation item: Projects(51204206, 41272304, 41372278) supported by the National Natural Science Foundation of China; Project(20110162120057) supported by PhD Program Foundation of Ministry of Education China; Project(201012200232) supported by the Freedom Explore Program of Central South University, China

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Liu, Xl., Li, Xb., Hong, L. et al. Acoustic emission characteristics of rock under impact loading. J. Cent. South Univ. 22, 3571–3577 (2015). https://doi.org/10.1007/s11771-015-2897-8

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  • DOI: https://doi.org/10.1007/s11771-015-2897-8

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