Modelling of a rapidly evolving rockslide: the Mt. de la Saxe case study

International Symposium on Geohazards and Geomechanics 2015

地球科学;生态环境科学

Castellanza, R.^1 ; Crosta, G.B.^1 ; Frattini, P.^1 ; Frigerio, G.^2 ; Di Prisco, C.^2 ; Dattola, G.^1 ; Bertolo, D.^3

DISAT - Università di Milano Bicocca, Italy^1

DICA - Politecnico di Milano, Italy^2

Struttura Organizzativa Attività Geologiche, Regione Valle d'Aosta, Italy^3

关键词: Complex 3D geometry;    Friction angles;    Interaction forces;    Irreversible deformation;    Pseudo-dynamics;    Sliding velocities;    Spatial discretizations;    Temporal evolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/26/1/012059/pdf
DOI  :  10.1088/1755-1315/26/1/012059

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

To model the temporal evolution of complex landslides, a 1D pseudo-dynamic visco-plastic approach, based on Perzyna's theory, has been conceived. In the original version of the model the viscous nucleus has been assumed to be bi-linear: irreversible deformations develop uniquely for positive yield function values whereas, in a more general case, even for negative values. In this work the model has been enriched by considering: i) an exponential viscous nucleus, ii) a strain-rate softening to reduce friction angle as sliding velocity increases and iii) block interaction forces to cope with complex 3D geometries for the sliding mass. The application of the proposed model to the La Saxe rockslide (Italy) clearly shows how a relatively simple model can be applied to a complex landslide by considering a spatial discretization of the sliding mass.