Abstract
The fabric and the hydro-mechanical behaviour of compacted clayey silt samples were investigated before and after drying-wetting cycles. Drying-wetting cycles changed the soil fabric by increasing the macro-porosity, while the total void ratio remained almost constant. The cycled samples were more compressible than the original ones and experienced a smaller decrease of suction during shearing at constant water content. The higher compressibility is associated to a more evident reduction of macro-porosity. The smaller suction decrease is reproduced with a double structure water retention model accounting for changes in macro-porosity during shearing. Cycled samples mobilised higher strength and showed a higher dilatancy than original samples sheared at the same initial total stress and suction; furthermore, dilatancy increased with suction for both fabrics. The Li and Dafalias stress-dilatancy relationship, formulated in terms of a macrostructural Bishop stress and accounting for a suction dependency, allowed reproducing the experimental results accurately.
Original language | English |
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Title of host publication | Unsaturated Soils 2018: The 7th International Conference on Unsaturated Soils 2018 (UNSAT2018) |
Publisher | International Society for Soil Mechanics and Geotechnical Engineering |
Number of pages | 7 |
ISBN (Print) | 9789887803737, 9887803731 |
Publication status | Published - 3 Aug 2018 |