Water retention and shrinkage curves of weathered pyroclastic soil

Ana Sofia Dias*, Abhijith Kamath, Marianna Pirone, Gianfranco Urciuoli

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

The modelling of the triggering mechanism of rainfall-induced landslides in slopes covered by pyroclastic soil (as the area surrounding Mount Vesuvius in Campania, Italy) requires the hydraulic characterization of soil in unsaturated conditions in order to analyse the slope response to rainfalls. In previous studies carried out on Campanian pyroclastic soils, the volumetric soil changes due to suction changes have been disregarded, being them negligible in soils characterized by low plasticity and low clay contents. However, a more accurate determination of the water retention curve (WRC) in terms of volumetric water content requires a correct estimation of the total soil volume, which is affected by the soil stress-state. The proper approach would require the estimation of both WRC in terms of gravimetric water content and the shrinkage curve (SC). In the present study, a relation between void ratio and suction was determined for a pyroclastic soil sampled at Mount Faito in Southern Italy. Therefore, a correction of the volumetric water content was carried out resulting in updated water retention curves. Here, the matric suction was the only factor affecting the stress-state of the soil.

Original languageEnglish
Article number03003
JournalE3S Web of Conferences
Volume195
DOIs
Publication statusPublished - 2020
Event4th European Conference on Unsaturated Soils, E-UNSAT 2020 - Lisboa, Portugal
Duration: 19 Oct 202021 Oct 2020

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