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| | Abstract | | The authors have been studying on evaluating soundness of tunnel lining concrete. One of the important issues on the evaluation is the characteristics of cracks appeared on the concrete surface. There are some methods to determine the depth of the opened crack by using diffraction of ultrasonic waves or attenuation of surface waves. In this study, we conducted physical model experiments to clarify the relationship between surface-wave propagation characteristics and the geometrical properties of cracks. We applied surface waves to determine the depth and dip direction of open cracks in concrete. Although there had been some research works on surface-wave applications for crack characterization, those methods treated cracks extending perpendicular to the concrete surface. In this study, we treated dipping cracks as well. As the results of physical model experiments, we found that the depth of a crack could be estimated from the attenuation of surface waves passing through the crack, and the dip direction could be estimated from the dispersion of surface waves obtained by the survey lines arranged parallel to the crack. |
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