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EnglishThe 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 macroporosity. 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 macro-structural Bishop stress and accounting for a suction dependency, allowed reproducing the experimental results accurately.
| Titolo: | Evolving fabric and its impact on the shearing behaviour of a compacted clayey silt exposed to drying-wetting cycles |
| Autori: | |
| Data di pubblicazione: | 2018 |
| 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 macroporosity. 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 macro-structural Bishop stress and accounting for a suction dependency, allowed reproducing the experimental results accurately. |
| ISBN: | 978-988-14032-2-3 |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| AA_GM_CJ_RMC_Hong kong 2018_revision_last.pdf | Articolo presentato alla conferenza internazionale di meccanica dei terreni non saturi | 2. Post-print | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2725390
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