Abstract. This paper presents an experimental and numerical investigation funded by the French National Project "Terredurable", which is devoted to the study of soils in quasi-saturated state. The experimental study is focused on the behavior of compacted soils on drying-wetting paths and the macroscopic effect of the drying path on shrinkage and cracking. Furthermore, a protocol for image analysis of crack in drying tests was developed. Two approaches are used for the measurement of surface strains and identification of the ultimate stress before the formation of the first crack, using VIC-2D software, and for the monitoring of crack evolution, using ImageJ software. The aim of the numerical approach is to reproduce the drying experiments with a finite difference code (FLAC 3D), in order to understand the stress conditions that can explain crack initiation, without modeling the crack formation itself.
Abstract. The research presented in this publication is funded by the French National Project « Terredurable », which is dedicated to the study of soils in quasi-saturated conditions (close to saturation). Stability and deformation of earth structures are reanalyzed with a quasi-saturated hydromechanical model. In this paper, IPI tests are modeled with a two-dimensional explicit finite difference program (Flac 2D). The model presented considers mechanical soil theory to approach earthwork tests by integrating a compressible bulk modulus. Results of the numerical approach show how it is possible to link parameters of near saturation soil mechanic (saturation, suction) to earthwork strength of soil parameters (IPI value).This communication is devoted to the simulation of IPI tests. In the first part, details about Proctor test and IPI tests will be given, with main experimental results. Then oedometric tests, suction measurement, triaxial tests, mercury porosimetry and grain density (γ s ) measurements have been performed on Proctor samples in order to feed our model to simulate soils near saturation. Finally simulations are carried out using FLAC to reproduce IPI settlement curves. This paper aims at a better comprehension of IPI tests and the hydro-mechanical behavior related to those tests.
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