Thermodynamic Analysis of Instability in Unsaturated Soils
The paper deals with the description of mechanical instability in unsaturated soils. The problem is studied by applying the thermodynamics of open continua. The localization and bifurcation in plane strain condition is studied as a boundary value problem. The paper shows that classic Finite Element Method (FEM) can be successfully applied in the analysis of instability induced by the distortion of the original reference volume. The paper also shows that classic elastoplasticity can be successfully applied for the description of the continuum without the need of any length scale. The ill-posedness of the problem is resolved by introducing into rate-independent constitutive equations the effect of the enthalpy of the gas phase.
KeywordsGranular Material Unsaturated Soil Water Retention Curve Biaxial Test Undrained Condition
The paper is part of a larger research on the analyses of landslides and the role of vegetation and evapotranspiration, funded by the European Commission in the 7th Framework Program for Industry-Academia Partnerships and Pathways FP7-PEOPLE-2012-IAPP Grant no: 324466.
- Rudnicki JW, Rice JR (1975) Conditions for the localization of deformation in pressure-sensitive dilatant materials. J Mech Phys Solids 23:371–394Google Scholar