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Timelapse ultrasonic tomography for measuring damage localization in geomechanics laboratory tests.

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Author

Summary, in English

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 a sample including a well defined layer with different mechanical properties than the matrix.

Publishing year

2015

Language

English

Pages

1389-1400

Publication/Series

Journal of the Acoustical Society of America

Volume

137

Issue

3

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Geotechnical Engineering

Keywords

  • Velocity measurement
  • Mechanical properties
  • Ultrasonic Tomography
  • Ultrasonic velocity

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-8524