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High-Frequency Hydroacoustic Monitoring in an Underground Iron Mine

Abstract : The monitoring of the stability of old mines constitutes an important research objective for our institution, BRGM. The study reported here shows the contribution of high-frequency (>30 kHz) acoustic emissions to the detection of the damage within a rock mass, during an experiment within a pilot site of an old flooded iron mine. The experiment consisted of recording all the hydroacoustic events in a broad frequency band (between 30 Hz and 180 kHz), during 18 months. The monitoring network has been calibrated by a triggered block fall that made it possible to highlight a relationship between the occurrence of high-frequency/low-frequency hydroacoustic emissions and rock falls. The events recorded have been associated with the micro-failure of the rock mass near the roof, prior to the detachment of the blocks. This monitoring showed important high-frequency hydroacoustic activity, which may be associated with mechanical instabilities generated by the evolution of water pressure during the experiment. In conclusion, the high-frequency hydroacoustic activity appears to be a good indicator of instability and, therefore, this new technique constitutes a promising tool for monitoring abandoned underground cavities.
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https://hal-brgm.archives-ouvertes.fr/hal-03647368
Contributeur : Frédérique COUFFIGNAL Connectez-vous pour contacter le contributeur
Soumis le : mercredi 20 avril 2022 - 14:38:43
Dernière modification le : mercredi 3 août 2022 - 04:06:09

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Séverine Bernardie, Jean-Pascal Gilbert, François Lebert, Hubert Fabriol. High-Frequency Hydroacoustic Monitoring in an Underground Iron Mine. Pure and Applied Geophysics, Springer Verlag, 2007, 164 (1), pp.177-197. ⟨10.1007/s00024-006-0153-8⟩. ⟨hal-03647368⟩

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