The complex time-dependent behavior of two case studies has been studied by performing a 2D numerical simulation. The evolution of the Vajont landslide from 1960 to 1963 catastrophic failure, and of the Mt. de La Saxe rockslide from 2009 to 2012 are examined. Simulations were carried out using the finite difference code FLAC. Firstly, we carried out some shear strength reduction analysis for solving elasto-plastic critical parameters of the basal shear band. Afterwards we applied different timedependent viscous rheological models identifying the Burgers-creep viscoplastic model (Mohr-Coulomb failure criterion coupled with general Burgers-creep model) as the most appropriate one for the simulation of the behaviour of the two phenomena and of large rockslides exhibiting a similar behaviour. Both models have been calibrated and subsequently validated on a long time series of monitoring data.
De Caro, M., Crosta, G., Castellanza, R., Agliardi, F., Volpi, G., Alberti, S. (2016). 2D Modelling of rockslide displacements by non-linear time dependent relationships. In Landslides and Engineered Slopes. Experience, Theory and Practice: Proceedings of the 12th International Symposium on Landslides (Napoli, Italy, 12-19 June 2016) (pp. 765-770). Roma : Taylor and Francis Inc. [10.1201/b21520-89].
2D Modelling of rockslide displacements by non-linear time dependent relationships
De Caro, M;Crosta, G;Castellanza, R;Agliardi, F;Volpi, G.;Alberti, S
2016
Abstract
The complex time-dependent behavior of two case studies has been studied by performing a 2D numerical simulation. The evolution of the Vajont landslide from 1960 to 1963 catastrophic failure, and of the Mt. de La Saxe rockslide from 2009 to 2012 are examined. Simulations were carried out using the finite difference code FLAC. Firstly, we carried out some shear strength reduction analysis for solving elasto-plastic critical parameters of the basal shear band. Afterwards we applied different timedependent viscous rheological models identifying the Burgers-creep viscoplastic model (Mohr-Coulomb failure criterion coupled with general Burgers-creep model) as the most appropriate one for the simulation of the behaviour of the two phenomena and of large rockslides exhibiting a similar behaviour. Both models have been calibrated and subsequently validated on a long time series of monitoring data.
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