Écoulements préférentiels dans un sol fin compacté

Abstract : The development of preferential flow paths in the porous medias constitutes an aspect which must be controlled for effective caracterizations of these materials. ln order to understand this phenomenon in the fine soils, a study is realised according to the morphological method on a plastic fine soil, the silt of Jossigny. The Blue Brilliance is used to dye the preferential flow paths. The material at various water contents and sizes of the clods is compacted according to various methods of compaction (dynamic and semi-static) by layers. Infiltration of dye under various hydraulic pressures indicates the development of preferential flow paths in the dynamic compacted samples, while those resulting from the semi-static compaction present a quasi-homogeneous distribution and evolution of flow in the soil. The development of the preferential flow paths to low and average water contents in the dynamically compacted samples is not a function of the initial state of the soil and the applied hydraulic pressure. It depends exclusively to structural heterogeneity of such a medium after compaction. The data resulting from the image processing on these samples are used for an attempt at three-dimensional visualization of preferential flow paths. Simulation is realised with gOcad software modelisation. Homogeneous samples resulting trom semi-static compaction are prepared according to a particular proceeding developed during the present work. This proceeding results trom the study of preferential flows and the study of distribution and evolution of density in dynamically compacted samples, and the study of evolution of the void ratio in semi-static compaction of a fine soil. These homogeneous samples are used to study infiltration in a partir fine soil with a slight confining pressure. ln the case of material used in this study, and for the conditions of test and experimental procedure considered, because of the soil-membrane effects and changes of the structure of the soil under the action of confining during infiltration process (hydro-mechanics coupling) some difficulties have been noted
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Theses
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http://docnum.univ-lorraine.fr/prive/INPL_T_1998_EFFENGUET_H_C.pdf
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Submitted on : Thursday, March 29, 2018 - 12:54:39 PM
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Hervé Crépin Effenguet. Écoulements préférentiels dans un sol fin compacté. Autre. Institut National Polytechnique de Lorraine, 1998. Français. ⟨NNT : 1998INPL094N⟩. ⟨tel-01750777⟩

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