Study of Physical Modelling for Piles

Abstract

Physical modeling due to its simulation ability of real conditions has been developed as a proper method to study engineering issues. In this paper after the introduction of usual physical modeling systems in geotechnical engineering, we focused on a low known device of physical modeling in geotechnical practice, especially applicable in deep foundations. It is named Frustum Confining Vessel (FCV) that is one of the calibration chamber forms. It can apply high stress level by a relatively linear stress distribution. Thus, it can simulate actual states for piles in laboratory controlled conditions. The FCV test results can be used for real project by multiply scale factors. Scale factors can be explained by dimensional and similar analyses in every model and apparatus. In this study the relatively largest size of FCV among others in the world, which called FCV-AUT, was used to study physical purposes. Several various model piles (deep foundations) were made by 4 mm thick steel plate with height of 750 mm. All model piles tested in Babolsar sand as surrounding soil via FCV, and two full scale piles tested in similar conditions in the field. The experimental results and outcomes indicated the FCV can be used as a suitable device for physical modelling aims. Thus, it can be realized the FCV is more effective than simple and calibration chambers as well as laminar boxes and more economic than centrifuges.

Model Tests on Determining the Effect of Various Geometrical Aspects on Horizontal Impedance Function of Surface Footings

“…However, there are limited studies conducted on small-scale experiments. As the examples are Nii [51], Wong and Luco [52] and Momeni et al [53] who carried out an extensive investigation on IFs of a rigid rectangular surface foundation under viscoelastic homogeneous half-space conditions.…”

“…Some studies have evaluated IFs using physical model tests. A few important studies have been performed in this regard on surface foundations by Erden [61], Nii [51], Pak and Guzina [1], Cheney et al [44], Fattah et al [62] and Momeni et al [53]. In these studies, a surface footing was placed in a container box, and a dynamic load was applied to it.…”