This paper discusses an analytical approach to define Factors of Safety (FS) for shallow slopes based on plasticity theories for unsaturated soils. The objective is to use such indices in landslide susceptibility analyses at the regional scale, thus gaining a mechanistic interpretation of the variability of the failure mode, as well as of the role of the evolving hydrologic state. For this purpose, two mechanisms of failure have been considered: uncoupled mechanisms due to drained frictional failure (here referred to as soil slips) and fully coupled mechanisms associated with an unstable pressurization of the pore fluid (here referred to as flowslides). For each scenario, expressions of FS have been derived in analytical form by identifying losses of uniqueness and/or existence of the deformation/wetting response predicted by a simple model for unsaturated sloping ground. To test the hypotheses, a dataset of landslides occurred in Southern Italy in 1998 has been used. For this purpose, the FS values have been combined with a hydrologic model to simulate pore pressure transients due to rain infiltration, thus enabling an integrated assessment of the spatially-distributed patterns of frictional slips and flow failures at regional scale. Preliminary results show the possibility to capture some of the main morphometric characteristics of these events, such as the overall distribution of types of failure with respect to slope angle and/or failure depth, suggesting that principles of unsaturated soil plasticity represent convenient tools to augment physically-based models for landslide forecasting.

Lizarraga, J., Buscarnera, G., Frattini, P., Crosta, G. (2016). Spatially distributed modeling of landslide triggering: An approach based on principles of unsaturated soil plasticity. In Landslides and Engineered Slopes. Experience, Theory and Practice - Proceedings of the 12th International Symposium on Landslides (Napoli, Italy, 12-19 June 2016) (pp.1287-1294). PO BOX 11320, LEIDEN, 2301 EH, NETHERLANDS : Taylor and Francis Inc. [10.1201/9781315375007-147].

Spatially distributed modeling of landslide triggering: An approach based on principles of unsaturated soil plasticity

Frattini, P
Penultimo
;
Crosta, GB
Ultimo
2016

Abstract

This paper discusses an analytical approach to define Factors of Safety (FS) for shallow slopes based on plasticity theories for unsaturated soils. The objective is to use such indices in landslide susceptibility analyses at the regional scale, thus gaining a mechanistic interpretation of the variability of the failure mode, as well as of the role of the evolving hydrologic state. For this purpose, two mechanisms of failure have been considered: uncoupled mechanisms due to drained frictional failure (here referred to as soil slips) and fully coupled mechanisms associated with an unstable pressurization of the pore fluid (here referred to as flowslides). For each scenario, expressions of FS have been derived in analytical form by identifying losses of uniqueness and/or existence of the deformation/wetting response predicted by a simple model for unsaturated sloping ground. To test the hypotheses, a dataset of landslides occurred in Southern Italy in 1998 has been used. For this purpose, the FS values have been combined with a hydrologic model to simulate pore pressure transients due to rain infiltration, thus enabling an integrated assessment of the spatially-distributed patterns of frictional slips and flow failures at regional scale. Preliminary results show the possibility to capture some of the main morphometric characteristics of these events, such as the overall distribution of types of failure with respect to slope angle and/or failure depth, suggesting that principles of unsaturated soil plasticity represent convenient tools to augment physically-based models for landslide forecasting.
paper
unsaturated soil plasticity
English
International Symposium on Landslides
2016
Aversa, S; Cascini, L; Picarelli, L; Scavia, C
Landslides and Engineered Slopes. Experience, Theory and Practice - Proceedings of the 12th International Symposium on Landslides (Napoli, Italy, 12-19 June 2016)
9781138029880
2016
2
1287
1294
https://www.taylorfrancis.com/books/e/9781315375007/chapters/10.1201/9781315375007-147
none
Lizarraga, J., Buscarnera, G., Frattini, P., Crosta, G. (2016). Spatially distributed modeling of landslide triggering: An approach based on principles of unsaturated soil plasticity. In Landslides and Engineered Slopes. Experience, Theory and Practice - Proceedings of the 12th International Symposium on Landslides (Napoli, Italy, 12-19 June 2016) (pp.1287-1294). PO BOX 11320, LEIDEN, 2301 EH, NETHERLANDS : Taylor and Francis Inc. [10.1201/9781315375007-147].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/262709
Citazioni
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
Social impact