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True-Triaxial Experimental Study of the Evolutionary Features of the Acoustic Emissions and Sounds of Rockburst Processes

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Abstract

Rockbursts are markedly characterized by the ejection of rock fragments from host rocks at certain speeds. The rockburst process is always accompanied by acoustic signals that include acoustic emissions (AE) and sounds. A deep insight into the evolutionary features of AE and sound signals is important to improve the accuracy of rockburst prediction. To investigate the evolutionary features of AE and sound signals, rockburst tests on granite rock specimens under true-triaxial loading conditions were performed using an improved rockburst testing system, and the AE and sounds during rockburst development were recorded and analyzed. The results show that the evolutionary features of the AE and sound signals were obvious and similar. On the eve of a rockburst, a ‘quiescent period’ could be observed in both the evolutionary process of the AE hits and the sound waveform. Furthermore, the time-dependent fractal dimensions of the AE hits and sound amplitude both showed a tendency to continuously decrease on the eve of the rockbursts. In addition, on the eve of the rockbursts, the main frequency of the AE and sound signals both showed decreasing trends, and the frequency spectrum distributions were both characterized by low amplitudes, wide frequency bands and multiple peak shapes. Thus, the evolutionary features of sound signals on the eve of rockbursts, as well as that of AE signals, can be used as beneficial information for rockburst prediction.

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Acknowledgements

The authors would like to thank financial support from the National Natural Science Foundation of China under Grant Nos. 41472329 and 51369007. The work has been also supported by the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences under Grant No. Z016009, Guangxi Natural Science Foundation under Grant No. 2016GXNSFGA380008.

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Authors and Affiliations

  1. Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education, School of Civil and Architecture Engineering, Guangxi University, Nanning, 530004, People’s Republic of China

    Guoshao Su, Yanjiong Shi, Jianqing Jiang & Jie Zhang

  2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, People’s Republic of China

    Guoshao Su, Xiating Feng & Quan Jiang

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  1. Guoshao Su
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  2. Yanjiong Shi
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Correspondence to Guoshao Su.

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Su, G., Shi, Y., Feng, X. et al. True-Triaxial Experimental Study of the Evolutionary Features of the Acoustic Emissions and Sounds of Rockburst Processes. Rock Mech Rock Eng 51, 375–389 (2018). https://doi.org/10.1007/s00603-017-1344-6

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  • DOI: https://doi.org/10.1007/s00603-017-1344-6

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