Dynamic Poroelasticity Based Method for Falling Weight Deflectometer Test Analysis

Hongwei Liu, Pooneh Maghoul, Ahmed Shalaby

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Transportation Geotechnics

ABSTRACT: Pavement structures reach performance limits when there are multiple deteriorations caused by repeated vehicle loading and environmental effects. Therefore, acquiring detailed information about the state of the pavement structures is an important element in rehabilitation planning of sections showing significant damage. Falling Weight Deflectometer Test (FWD) is one of the most popular Non-Destructive Testing (NDT) techniques in characterization of the mechanical properties of the pavement structure. The FWD test measures the surface deflections caused by dropping a known mass from a specific height. Geophones are used to record the time histories of the vertical deflections of the pavement surface at various distances from the centre of the load-plate. The response at the surface calculated from Boussinesq theory (static analysis) and proposed dynamic analysis are compared. Furthermore, the damping effect of water on the FWD test data under dynamic load is investigated.

RÉSUMÉ: Les structures de la chaussée atteignent des limites de performance en cas de détériorations multiples causées par des lément important de la planification de la réhabilitation des sections présentant destructif (CND) les plus répandues dans la caractérisation des propriétés mécaniques de la structure de la chaussée. Le géophones enregistrent les historiques temporels des déviations verticales de la surface de la chaussée à différentes distances du centre du plateau de charge. La réponse à la surface calculée à partir de la théorie de Boussinesq (analyse test FWD sous charge dynamique est étudié.

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