TITLE:
Characterization and Classification of Rocks with Lamb Modes
AUTHORS:
Dris El Abassi, Bouazza Faiz, Abderahmane Ibhi, Idris Aboudaoud
KEYWORDS:
Ultrasound; Lamb Waves; Nondestructive Investigation; Magmatic Rocks; Metamorphic Rocks; Sedimentary Rocks
JOURNAL NAME:
International Journal of Geosciences,
Vol.3 No.3,
July
20,
2012
ABSTRACT: The nondestructive investigation by ultrasound has become a fundamental tool for characterizing rocks. We applied this technique for characterizing samples of rocks. The later had been members of the following three big families of geogical classification: magmatic rocks, metamorphic rocks, sedimentary rocks. The method usually used is based on the measurement of ultrasound parameters, i.e. the longitudinal and transversal propagation velocities. The measurement of these parameters allows to determine the mechanical properties of each rock. These studies do not allow to find the three big axes of the rocks. In this work we show for each rock his corresponding ultrasonic signature by the use of his experimentally determined Lamb dispersion curves. The obtained results put in evidence that the descending slope of the Lamb modes is a reliable and efficient criterion for classifying rocks by ultrasound. This is an adequate solution for a good classification of rocks. It gives a high precision, it is reliable and quick and last not least cheap.