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Exploitation du signal pénétrométrique pour l'aide à l'obtention d'un modèle de terrain

Abstract : This research focuses on the site characterization of shallow soils using the dynamic cone penetrometer Panda® which uses variable energy. The main purpose is to study and propose several techniques as part of an overall method in order to obtain a ground model through a geotechnical campaign based on the Panda test.This work is divided into four parts, each of them it is focused on a specific topic :first of all, we introduce the main site characterization techniques, including the dynamic penetrometer Panda. Then, we present a brief overview of the geotechnical model and the mathematical methods for the characterization of uncertainties in soil properties;the second part deals with the automatic identification of physical homogeneous soil units based on penetration's mechanical response of the soil using the Panda test. Following a study about the soil layers identification based only on expert's judgment, we have proposed statistical moving window procedures for an objective assessment. The application of these statistical methods have been studied for the laboratory and in situ Panda test;the third part focuses on the automatic classification of the penetrations curves in the homogeneous soil units identified using the statistical techniques proposed in part II. An automatic methodology to predict the soil grading from the dynamic cone resistance using artificial neural networks has been proposed. The framework has been studied for two different research problems: the classification of natural soils and the classification of several crushed aggregate-bentonite mixtures;finally, the last chapter was devoted to model the spatial variability of the dynamic cone resistance qd based on random field theory and geostatistics. In order to reduce uncertainty in the field where Panda measurements are carried out, we have proposed the use of conditional simulation in a three dimensional space. This approach has been applied and studied to a real site investigation carried out in an alluvial mediterranean deltaic environment in Spain. Complementary studies in order to improve the proposed framework have been explored based on another geotechnical campaign conducted on a second experimental site in France.
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https://tel.archives-ouvertes.fr/tel-01842259
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Submitted on : Wednesday, July 18, 2018 - 9:56:19 AM
Last modification on : Tuesday, January 15, 2019 - 3:03:42 PM
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  • HAL Id : tel-01842259, version 1

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Carlos Sastre Jurado. Exploitation du signal pénétrométrique pour l'aide à l'obtention d'un modèle de terrain. Génie civil. Université Clermont Auvergne, 2018. Français. ⟨NNT : 2018CLFAC003⟩. ⟨tel-01842259⟩

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