Revisiting the thermodynamics of hardening plasticity for unsaturated soils

Details Revisiting the thermodynamics of hardening plasticity for unsaturated soils Revisiting the thermodynamics of hardening plasticity for unsaturated soils

2010-10-13

arxiv.org/abs/1010.2598v1

Computers and Geotechnics 37, 1-2 (2010) 207-215

Physics

Geophysics

Scientific paper

10.1016/j.compgeo.2009.09.003

A thermodynamically consistent extension of the constitutive equations of saturated soils to unsaturated conditions is often worked out through the use a unique 'effective' interstitial pressure, accounting equivalently for the pressures of the saturating fluids acting separately on the internal solid walls of the pore network. The natural candidate for this effective interstitial pressure is the space averaged interstitial pressure. In contrast experimental observations have revealed that, at least, a pair of stress state variables was needed for a suitable framework to describe stress-strain-strength behaviour of unsaturated soils. The thermodynamics analysis presented here shows that the most general approach to the behaviour of unsaturated soils actually requires three stress state variables: the suction, which is required to describe the invasion of the soil by the liquid water phase through the retention curve; two effective stresses, which are required to describe the soil deformation at water saturation held constant. However a simple assumption related to the plastic flow rule leads to the final need of only a Bishop-like effective stress to formulate the stress-strain constitutive equation describing the soil deformation, while the retention properties still involve the suction and possibly the deformation. Commonly accepted models for unsaturated soils, that is the Barcelona Basic Model and any approach based on the use of an effective averaged interstitial pressure, appear as special extreme cases of the thermodynamic formulation proposed here.

Affiliated with

Also associated with

No associations

Rating

Revisiting the thermodynamics of hardening plasticity for unsaturated soils does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Revisiting the thermodynamics of hardening plasticity for unsaturated soils, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revisiting the thermodynamics of hardening plasticity for unsaturated soils will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-226270