In this work we have analyzed a “cold case”, i.e., the prolonged rainfall and flood event occurred in the Piedmont region (Northern Italy) in November 1994, causing several hundred of shallow landslides. The research aim is to put some focus on the possibility to calibrate soil parameters by means of the combined use of a simple hydrological model (Rosso et al. 2006) and post-event geotechnical surveys. For this purpose, a database of geometries and soil characteristics for 238 observed landslides has been used. To address the calibration of the cohesion and hydraulic conductivity parameters, the safety factor expression from the Limit Equilibrium Analysis has been targeted to assume a maximum value of 1 for all the slopes made unstable by the actual (measured) rainfall. Significant reduction of the cohesion parameter was observed after calibration, suggesting caution in the use of literature values, typically obtained on mechanically undisturbed soil samples

Calibrating saturated conductivity and soil cohesion in rainfall-triggered landslides in the Langhe area (1994) / Evangelista, Giulia; Barbero, Monica; Butera, Ilaria; Castelli, Marta; Claps, Pierluigi; Tamea, Stefania. - ELETTRONICO. - (2021), pp. 176-177. ((Intervento presentato al convegno 2nd IAHR Young Professionals Congress tenutosi a Online nel 30 Novembre - 2 Dicembre 2021.

Calibrating saturated conductivity and soil cohesion in rainfall-triggered landslides in the Langhe area (1994)

Evangelista, Giulia;Barbero, Monica;Butera, Ilaria;Castelli, Marta;Claps, Pierluigi;Tamea, Stefania
2021

Abstract

In this work we have analyzed a “cold case”, i.e., the prolonged rainfall and flood event occurred in the Piedmont region (Northern Italy) in November 1994, causing several hundred of shallow landslides. The research aim is to put some focus on the possibility to calibrate soil parameters by means of the combined use of a simple hydrological model (Rosso et al. 2006) and post-event geotechnical surveys. For this purpose, a database of geometries and soil characteristics for 238 observed landslides has been used. To address the calibration of the cohesion and hydraulic conductivity parameters, the safety factor expression from the Limit Equilibrium Analysis has been targeted to assume a maximum value of 1 for all the slopes made unstable by the actual (measured) rainfall. Significant reduction of the cohesion parameter was observed after calibration, suggesting caution in the use of literature values, typically obtained on mechanically undisturbed soil samples
978-90-824846-7-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2959138