A new landslide model is proposed by improving on an existing one, which is able to interpret using a simple I-D mechanism the post-failure sliding regime of catastrophic landslides and rockslides consisting of a coherent mass sliding on a thin clayey layer. The model takes into account frictional heating and subsequent pore pressure build-up, leading to the vanishing of shear resistance and unconstrained acceleration. First, an existing thermo-elasto-plastic constitutive model for clays is discussed, and modified by re-formulating it in a general stress space and taking into account thermal softening. The soil constitutive model is then employed into an existing landslide model. The resulting model equations are shown to be well-posed, and then are discretised and integrated numerically to back-analyse the final stage of the well-documented case history of Vajont that occurred in Italy in 1963. Finally, the results are used to highlight the possible importance of thermal softening in the development of catastrophic failure.
Numerical modelling of the thermo-mechanical behaviour of soils in catastrophic landslides / F. Cecinato, A. Zervos, E. Veveakis, I. Vardoulakis - In: Landslides and Engineered Slopes : from the Past to the Future / [a cura di] Z. Chen, J.M. Zhang, Z.K. Li, F.Q. Wu, K. Ho. - [s.l] : Taylor and Francis, 2008. - ISBN 9780415411967. - pp. 615-621 (( Intervento presentato al 10. convegno International Symposium on Landslides and Engineered Slopes tenutosi a Xian nel 2008.
|Titolo:||Numerical modelling of the thermo-mechanical behaviour of soils in catastrophic landslides|
|Parole Chiave:||Jiufengershan landslide; earthquake; taiwan|
|Settore Scientifico Disciplinare:||Settore ICAR/07 - Geotecnica|
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1201/9780203885284-c73|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|