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Geomechanics and Engineering
  Volume 17, Number 6, April30 2019 , pages 597-606

Detection of near surface rock fractures using ultrasonic diffraction techniques
Levent Selçuk

    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.
Key Words
    fracture mechanics; laboratory analysis; material nonlinearities; rock; rock fills
Levent Selçuk: Van Yüzüncü Yil University, Faculty of Engineering, Department of Geological Engineering, Van/Tuşba, 65080, Turkey

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