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http://dx.doi.org/10.12989/gae.2019.17.6.597

Detection of near surface rock fractures using ultrasonic diffraction techniques  

Selcuk, Levent (Department of Geological Engineering, Faculty of Engineering, Van Yuzuncu Yil University)
Publication Information
Geomechanics and Engineering / v.17, no.6, 2019 , pp. 597-606 More about this Journal
Abstract
Ultrasonic Time-of-Flight Diffraction (TOFD) techniques are useful methods for non-destructive evaluation of fracture characteristics. This study focuses on the reliability and accuracy of ultrasonic diffraction methods to estimate the depth of rock fractures. The study material includes three different rock types; andesite, basalt and ignimbrite. Four different ultrasonic techniques were performed on these intact rocks. Artificial near-surface fracture depths were created in the laboratory by sawing. The reliability and accuracy of each technique was assessed by comparison of the repeated measurements at different path lengths along the rock surface. The standard error associated with the predictive equations is very small and their reliability and accuracy seem to be high enough to be utilized in estimating the depth of rock fractures. The performances of these techniques were re-evaluated after filling the artificial fractures with another material to simulate natural infills.
Keywords
fracture mechanics; laboratory analysis; material nonlinearities; rock; rock fills;
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