TY - JOUR
T1 - Water retention and shrinkage curves of weathered pyroclastic soil
AU - Dias, Ana Sofia
AU - Kamath, Abhijith
AU - Pirone, Marianna
AU - Urciuoli, Gianfranco
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85097177972&partnerID=8YFLogxK
U2 - 10.1051/e3sconf/202019503003
DO - 10.1051/e3sconf/202019503003
M3 - Conference article
AN - SCOPUS:85097177972
SN - 2555-0403
VL - 195
JO - E3S Web of Conferences
JF - E3S Web of Conferences
M1 - 03003
T2 - 4th European Conference on Unsaturated Soils, E-UNSAT 2020
Y2 - 19 October 2020 through 21 October 2020
ER -