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Microstructural model for delayed deformation of clay: loading history effects
Alonso Pérez de Agreda, Eduardo; Navarro, Vicente
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica
Microstructural observations of clayey soils indicate that clay particles are aggregated in units of low internal porosity (microporosity). Larger voids (macroporosity) between those units are associated with the flow of free water. Within this context, the secondary deformation of clay is interpreted as being a consequence of local mass transfer of water from the micropores to the macropores. The capability of a model based on this idea to reproduce the effects of loading history on the secondary compression of clay is explored. An experimental test program has been performed, secondary compression records have been interpreted within the proposed theoretical framework, and material parameters have been derived. The simulation of additional validation tests has been successful. The theory and model developed provide a unified framework for compression, as well as swelling secondary deformation.
Peer Reviewed
Clay soils -- Creep
Clay soils -- Stability
Secondary consolidation
Overconsolidation ratio
Oedometer tests
Sòls argilosos -- Estabilitat
Sòls -- Consolidació
National Research Council Canada Research Press

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