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Utilisation des ondes de surface pour l'auscultation des structures en génie civil : application à la caractérisation des fissures de surface

Abstract : There is a increasing need for non destructive testing applied to concrete civil works. The use of surface waves, especially Rayleigh waves, fulfill many requirements to assess near surface of concrete structures because they are particularly energetic and sensitive to the surface state. The present work proposes and evaluates a method based on Rayleigh waves for the characterisation of surface cracks. The diffraction of R-waves by a surface crack is modelled with the Indirect Boundary Element Method (lBEM) to obtain the synthetic respons to an impulse input. The results make it possible to understand the diffraction pattern and to design a spectral analysis method for the determination of the crack depth . For the validation of the method on observed data, an experimental setup is developed and a data processing method is elaborated to eliminate source and receiver effects. The comparison of theoretical and experimental data on artificial cracks of different depths in concrete slabs shows that the method is reliable for these simple geometries. The method is then applied to special cases (water filled cracks, cracks with a point contact at different depths) and compared to the results obtained by the body waves transmission time method. The two methods show to be complementary, with a low experimental additional cost. They are finally carried out on a real cracks where it is confirmed they provide complementary information for the characterisation of cracks.
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https://tel.archives-ouvertes.fr/tel-00709828
Contributor : Pascale Talour <>
Submitted on : Tuesday, June 19, 2012 - 3:08:40 PM
Last modification on : Thursday, November 19, 2020 - 3:54:27 PM
Long-term archiving on: : Thursday, September 20, 2012 - 2:35:52 AM

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  • HAL Id : tel-00709828, version 1

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Grégoire Hévin. Utilisation des ondes de surface pour l'auscultation des structures en génie civil : application à la caractérisation des fissures de surface. Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 1998. Français. ⟨tel-00709828⟩

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