Timelapse ultrasonic tomography for measuring damage localization in geomechanics laboratory tests

The Journal of the Acoustical Society of America
Erika TudiscoGioacchino Viggiani

Abstract

Variation of mechanical properties in materials can be detected non-destructively using ultrasonic measurements. In particular, changes in elastic wave velocity can occur due to damage, i.e., micro-cracking and particles debonding. Here the challenge of characterizing damage in geomaterials, i.e., rocks and soils, is addressed. Geomaterials are naturally heterogeneous media in which the deformation can localize, so that few measurements of acoustic velocity across the sample are not sufficient to capture the heterogeneities. Therefore, an ultrasonic tomography procedure has been implemented to map the spatial and temporal variations in propagation velocity, which provides information on the damage process. Moreover, double beamforming has been successfully applied to identify and isolate multiple arrivals that are caused by strong heterogeneities (natural or induced by the deformation process). The applicability of the developed experimental technique to laboratory geomechanics testing is illustrated using data acquired on a sample of natural rock before and after being deformed under triaxial compression. The approach is then validated and extended to time-lapse monitoring using data acquired during plane strain compression of...Continue Reading

References

Feb 12, 2009·The Journal of the Acoustical Society of America·Philippe RouxW S Hodgkiss
Feb 10, 2011·The Journal of the Acoustical Society of America·Christian MarandetJérôme Mars
Jul 19, 2013·The Journal of the Acoustical Society of America·Florian AulanierJérôme I Mars
Sep 23, 2014·The Journal of the Acoustical Society of America·Philippe Roux, Barbara Nicolas

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