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http://dx.doi.org/10.7843/kgs.2007.23.1.51

Ultrasonic Reflection Imaging for Discontinuity Detection of Rock Mass - Laboratory Study  

Lee, Jong-Sub (Dept. of Civil Engrg., Korea Univ.)
Kim, Seung-Sun (Dept. of Civil Engrg., Korea Univ.)
Kim, Dong-Hyun (GS Engrg. & Construction, Geosystem Engrg. Team)
Kim, Uk-Young (GS Engrg. & Construction, Geosystem Engrg. Team)
Lee, In-Mo (Dept. of Civil Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.1, 2007 , pp. 51-65 More about this Journal
Abstract
The purpose of this study is the development and application of a high resolution ultrasonic wave imaging system to detect discontinuity plane in lab-scale rock models. This technique is based on received time series which capture the multiple reflections at interface. This study includes the fundamental aspects of ultrasonic wave propagation in rock mass, the selection of the optimal ultrasonic wave transducer, data gathering, a signal processing, imaging methods, and experiments. Experiments are carried out by the horizontal movement and rotation devices. Experimental studies show the discontinuity is well detected by the horizontal movement and rotation devices under water. Furthermore, the discontinuity and the cavity on the plaster block are identified by the rotation device. This study suggests that the new method may be an economical and effective tool for the detection of the discontinuity on rock mass.
Keywords
Cavity; Coupling; Directivity; Discontinuity; Impedance; Reflection; Signal processing; Transducer; Ultrasonic waves;
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