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Modélisation physique et numérique des interactions sol-structure sous sollicitations dynamiques transverses

Abstract : The main issues of this work concern the physical and numerical modeling of the response ofa shallow foundation under dynamic horizontal loadings.Two novative physical modeling were performed.The first one uses a calibration chamber to carry out tests on a model of shallow foundationembedded in a dry sand, simulating the field confining conditions. A new experimental setup isbuilt up in order to allow the foundation movement under the coupling of vertical and dynamichorizontal loading. The effect of the different parameters on the foundation behavior (sanddensity, horizontal and vertical loading amplitude, pressure on the sand bulk) is presented.The second one concerns the interaction between a shallow foundation and a reinforced soil,consisting in soft clay reinforced either by a Mixed Module Columns (MMC) system or aRigid Inclusions (RI) system. The 2D physical models subjected to quasi-static and dynamichorizontal cyclic loadings are set up in the "VisuCuve" of the laboratory to study the inertialeffect by lateral visualization of the behavior. The energy dissipation efficiency between theMMC system and the RI system is compared.The numerical modeling of the experiments and the full scale MMC and RI systems areperformed with FLAC3D. In spite of some differences, the 2D numerical results show generallythe same tendencies with the experimental ones. The damping ratios calculated in the fullscale modeling lead to the more accurate energy dissipation analyses. The inertial effect andthe influence of the upper gravel part height are also displayed in terms of the internal forces.
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Xiangwei Zhang. Modélisation physique et numérique des interactions sol-structure sous sollicitations dynamiques transverses. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENI084⟩. ⟨tel-00767071⟩

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