Modélisation de la transition solide-fluide dans les géomatériaux. Application aux glissements de terrain.

Geomaterials are present in nature in many forms : solid soil or rock, soft clay, almost liquid mud, etc. Geomechanics deals with the understanding the solid behavior of geomaterials. However, solid ground can happen, under specific external conditions, to turn into fluid : as for example during mudflows or debris flows. In such a context, our work concerns, in a general way, solid-fluid transition in geomaterials behavior and the development of a constitutive model describing both the solid phase, fluid phase, and the transition between the two. In this framework, we chose to carry out calculations with the FEMLIP numerical method (Finite Element Method with Lagrangians Integration Points) which has shown a strong potential to describe a wide variety of behaviors (including history dependent behavior), in a unique model. Having implemented and validated the first elasto-plastic law in Ellipsis (FEMLIP based code), we have introduced in this code the solid-fluid transition model. This last is based on the evolution, at the failure state detected by the second order work criterion, of the solid elasto-plastic behavior towards a viscous fluid behavior, exhibiting a yield stress. After validation of the solid-fluid transition model in homogeneous cases (considering Plasol elasto-plastic law and Bingham viscous one), we applied this model to the modeling of Sarno and Quindici mudflows (Italy, 1998).

Grantor dc:publisher

UJF - Université Joseph Fourier - Grenoble

Year dc:date

2012

Author dc:creator

• Prime, Noémie

Contributors dc:contributor

• Dufour, Frédéric
• Darve, Félix

• geomaterials
• landslides
• failure
• second order work
• solid-fluid transition
• visco-elasto-plasticity
• FEMLIP
• Engineering, computing & technology
• Civil engineering
• Ingénierie, informatique & technologie
• Ingénierie civile

Statement dc:rights

• restricted access
• info:eu-repo/semantics/restrictedAccess

Licence

• http://purl.org/coar/access_right/c_16ec

Language dc:language

fr

Identifier

info:hdl:2268/159029

OAI identifier oai:identifier

oai:orbi.ulg.ac.be:2268/159029