Benchmark of constitutive models for unsaturated soils

The paper presents a collaborative piece of research undertaken by seven research teams from different universities within the ‘Mechanics of Unsaturated Soils for Engineering' (MUSE) network. The objective is to benchmark different approaches to constitutive modelling of mechanical and water retention behaviour of unsaturated soils by comparing simulations of suction-controlled and constant water content laboratory tests. A set of 13 triaxial and oedometer laboratory tests, covering the mechanical and water retention behaviour of an unsaturated compacted silty soil under a variety of stress paths, has been provided by one of the seven participating teams. This data set has been used by the other six teams for calibrating a constitutive model of their choice, which has been subsequently employed for predicting strains and degree of saturation in three of the 13 tests used for calibration, as well as in one ‘blind' test for which experimental results had not been previously disclosed. By comparing predictio...

[1]  R. H. Brooks,et al.  Hydraulic properties of porous media , 1963 .

[2]  Huang Mao-song.  An anisotropic elastoplastic model for soft clays , 2007 .

[3]  David Mašín,et al.  Predicting the dependency of a degree of saturation on void ratio and suction using effective stress principle for unsaturated soils , 2010 .

[4]  Y. Cui,et al.  Yielding and plastic behaviour of an unsaturated compacted silt , 1996 .

[5]  D. Gallipoli,et al.  Effect of anisotropy on the prediction of unsaturated soil response under triaxial and oedometric conditions , 2010 .

[6]  Nasser Khalili,et al.  A bounding surface plasticity model for cyclic loading of granular soils , 2005 .

[7]  Minna Karstunen,et al.  Modelling the variation of degree of saturation in a deformable unsaturated soil , 2003 .

[8]  B Cambou,et al.  MODELE DE COMPORTEMENT DES SOLS NON COHERENTS , 1988 .

[9]  Nasser Khalili,et al.  A hypoplastic model for mechanical response of unsaturated soils , 2008 .

[10]  David Mašín,et al.  State boundary surface of a hypoplastic model for clays , 2005 .

[11]  D. Gallipoli,et al.  A sequential method for selecting parameter values in the Barcelona basic model , 2010 .

[12]  Antonio Gens,et al.  A constitutive model for partially saturated soils , 1990 .

[13]  Lyesse Laloui,et al.  Advances in modelling hysteretic water retention curve in deformable soils , 2008 .

[14]  N. Khalili,et al.  A unique relationship for χ for the determination of the shear strength of unsaturated soils , 1998 .

[15]  Nasser Khalili,et al.  A fully coupled flow deformation model for cyclic analysis of unsaturated soils including hydraulic and mechanical hystereses , 2008 .

[16]  D. Maš́ın,et al.  A hypoplastic constitutive model for clays , 2005 .

[17]  Lyesse Laloui,et al.  New insight into the unified hydro-mechanical constitutive modeling of unsaturated soils. , 2007 .

[18]  Gerd Gudehus,et al.  Graphical representation of constitutive equations , 2009 .

[19]  A Gens,et al.  CONSTITUTIVE MODELLING: APPLICATION TO COMPACTED SOILS , 1996 .

[20]  K. Roscoe,et al.  ON THE GENERALIZED STRESS-STRAIN BEHAVIOUR OF WET CLAY , 1968 .

[21]  Simon J. Wheeler,et al.  An elasto-plastic critical state framework for unsaturated soil , 1995 .

[22]  Patrick Dangla,et al.  Adaptation of existing behaviour models to unsaturated states: application to CJS model , 2005 .

[23]  D. Ma,et al.  A hypoplastic constitutive model for clays , 2004 .

[24]  Van Genuchten,et al.  A closed-form equation for predicting the hydraulic conductivity of unsaturated soils , 1980 .