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Auscultation et surveillance des pertubations hydromécaniques d'ouvrages souterrains par la mesure et l'analyse de la propagation d'ondes dans les roches

Abstract : The excavation of a drift creates a disturbed zone, which is called EDZ (Excavation Disturbed or Damaged Zone). The study of the mechanical characteristics of this zone is essential to estimate the stability of such a drift at short, mean or long term. The propagation of ultrasonic waves is used as a mean of analysis in rock mechanics since the 1960s. Initially, it was used to determine the dynamic elastic properties. Then, it was gradually adapted to the study of the other properties of the material such as cracking, porosity, saturation, etc. With the computer tools continuously more powerful, a more elaborated treatment of the signals became possible, which allows characterization of the "EDZ". The Tests carried out in laboratory, allowed us to correlate P-wave and mechanical parameters of the studied media in elastic and plastic phases. Besides, the mechanical modeling of the EDZ around a drift allows understanding the mechanical phenomena on the scale of the work. Finally, the results of an in-site experiment allowed us to locate the EDZ around an underground mine pillar. It contributed to have a better understanding of the mechanical models available and to estimate the pillar stability.
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Jamil Damaj, Cyrille Balland, Thierry Verdel, David Amitrano, Françoise Homand. Auscultation et surveillance des pertubations hydromécaniques d'ouvrages souterrains par la mesure et l'analyse de la propagation d'ondes dans les roches. International Conference on geotechnical engineering, May 2004, Beyrouth, Lebanon. pp.791-797. ⟨ineris-00976150⟩

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