Spectral Characteristics of Acoustic Emission in Loaded Coal Specimens for Failure Prediction

Сhanges in acoustic emission spectra of coal samples from the Kuznetsk and Pechora Basins are experimentally studied in uniaxial and triaxial (Karman-type) compression tests. It is shown that the acoustic emission spectral patterns change considerably at the pre-failure stage in the samples under un...

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Bibliographic Details
Published in:Journal of mining science 2017-09, Vol.53 (5), p.818-823
Main Authors: Shkuratnik, V. L., Nikolenko, P. V., Koshelev, A. E.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Acoustics
Amplitudes
Basins
Coal
Compression
Compression tests
Earth and Environmental Science
Earth Sciences
Emission analysis
Emission spectra
Fractures
Geomechanics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrostatic pressure
Mineral Resources
Surveys
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Summary:Сhanges in acoustic emission spectra of coal samples from the Kuznetsk and Pechora Basins are experimentally studied in uniaxial and triaxial (Karman-type) compression tests. It is shown that the acoustic emission spectral patterns change considerably at the pre-failure stage in the samples under uniaxial compression: the amplitudes of low-frequency components grow while those of high frequencies reduce. Under the Karman-type compression, the amplitudes of low-frequency signals grow while the high-frequency amplitudes do not change much, because lateral hydrostatic pressure impedes opening of vertical fractures.
ISSN:1062-7391
1573-8736
DOI:10.1134/S1062739117052825