NON-DESTRUCTIVE INSPECTION OF THE SURFACE OF UNDERGROUND STRUCTURES BASED ON THE PROPAGATION OF SURFACE WAVE
Simon-Pierre Tremblay, Mourad Karray, Mohamed Chekired, Carole Bessette, Livius Jinga
In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost ConferenceSession: Insitu Testing and Instrumentation II / Essais in situ et instrumentation II
ABSTRACT: This article shows how the propagation of surface waves is affected by the presence and the state of degradation of an underground concrete structure. In previous work, the behavior of elastic waves propagating in a soil profile containing an underground concrete structure was modelled using 2-dimensional numerical models. One of the drawbacks of using 2D models to represent 3D structures is that 2D models neglect the effect that out-of-plane discontinuities may have on the propagation of elastic waves. A 2D profile is therefore not fully representative of an underground profile containing a small concrete structure compared to the size of the soil deposit surrounding it. This paper uses a 3D finite difference method implemented in FLAC3D to show how the presence of a manhole and of a discontinuity at the surface of an underground concrete structure affects the propagation of surface waves.
RÉSUMÉ: Cet article démontre comment la propagation des ondes de surface est affectée par la présence et l'état de dégradation d'une structure souterraine en béton. Lors de travaux antérieurs, le comportement des ondes de surface se propageant dans un profil de sol contenant une structure souterraine a été modélisé avec des modèles numériques en 2 dimensions. L'un des inconvénients de l'utilisation de modèles 2D pour représenter des structures 3D est que les modèles 2D négligent les effets que peuvent avoir des discontinuités dans l™un des 3 axes sur la propagation des ondes élastiques. Dans le cas d'une structure souterraine de petite dimension comparativement au dépôt de sol, le profil souterrain peut cependant contenir des discontinuités dans toutes les directions. Cette étude utilise la méthode des différences finies en 3D implémentée dans FLAC3D pour montrer comment la présence d'un trou d'homme et de discontinuités à la surface d'une structure de béton souterraine affecte la propagation des ondes de surface.
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Simon-Pierre Tremblay; Mourad Karray; Mohamed Chekired; Carole Bessette; Livius Jinga (2015) NON-DESTRUCTIVE INSPECTION OF THE SURFACE OF UNDERGROUND STRUCTURES BASED ON THE PROPAGATION OF SURFACE WAVE in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.
@article{353,author = Simon-Pierre Tremblay; Mourad Karray; Mohamed Chekired; Carole Bessette; Livius Jinga,title = NON-DESTRUCTIVE INSPECTION OF THE SURFACE OF UNDERGROUND STRUCTURES BASED ON THE PROPAGATION OF SURFACE WAVE,year = 2015}