Summary
The technique developed uses the spectral signature or Fourier Transform of a signal to gain information about the rock mass. This process enables rock masses to be characterised by observing and quantifying the degree by which discontinuities and other rock mass characteristics preferentially filter the various frequency components of an induced signal. The initial analysis has concentrated on using the technique to investigate the dependence of attenuation spectra on discontinuity characteristics. This has been achieved by correlating statistically significant direct parameters with attenuation spectra from the same rock masses. The preliminary results given in the paper indicate the potential usefulness of the technique for characterising discontinuous rock.
Résumé
La technique qui a été mise au point utilise la signature spectrale ou transformation de Fourier d'un signal, pour obtenir l'information sur la masse rocheuse. Ce procédé permet de caractériser les masses rocheuses par l'observation et la quantification du degré auquel les discontinuités et autres caractères des masses rocheuses filtrent préférenciellement les diverses fréquences qui composent un signal. L'analyse initiale s'est concentrée sur l'emploi de cette technique pour chercher les relations entre spectre d'atténuation et caractères de discontinuité. Le résultat de cette recherche est une corrélation statistique entre paramètres directs significatifs et spectres d'atténuation pour les mêmes masses rocheuses. Les premiers résultats donnés dans cet article font apparaître l'utilité potentielle de cette technique pour caractériser les roches discontinues.
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Young, R.P., Coffey, J.R. & Hill, J.J. The application of spectral analysis to rock quality evaluation for mapping purposes. Bulletin of the International Association of Engineering Geology 19, 268–274 (1979). https://doi.org/10.1007/BF02600487
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DOI: https://doi.org/10.1007/BF02600487