Thermo-plasticity of clays: an isotropic yield mechanism

Abstract Numerical modelling of the thermo-mechanical behaviour of soils is an important issue in the analysis of problems such as nuclear waste isolation or geothermal structures. The purpose of this paper is to present a new thermo-plastic mechanism for isotropic thermo-mechanical paths including thermal hardening. It is based on considerations of the thermal effect on void ratio. After a discussion of the experimental evidence, the formulation of the thermo-plastic yield mechanism is introduced. Typical features are analysed and the responses of the model discussed. The proposed model is validated on the basis of experimental results on two different clays.

[1]  M. Tidfors,et al.  TEMPERATURE EFFECT ON PRECONSOLIDATION PRESSURE , 1989 .

[2]  C. A. Garzonio.  Variability of the geotechnical properties of plio-pleistocene clays (Ancona, Italy): Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13–18 August 1989 V2, P823–827. Publ Rotterdam: A A Balkema, 1989 , 1991 .

[3]  Lyesse Laloui,et al.  Thermo-Mechanical Modelling of the Behaviour of MC Clay , 2001 .

[4]  Lyesse Laloui,et al.  A thermo-viscoplastic constitutive model for clays , 1997 .

[5]  M. Moreni,et al.  Comportement d'un pieu bi-fonction, fondation et échangeur de chaleur , 2003 .

[6]  L. Laloui.  Thermo-mechanical behaviour of soils , 2001 .

[7]  James K. Mitchell,et al.  FIELD TESTING OF CABLE BACKFILL SYSTEMS , 1982 .

[8]  I. Towhata,et al.  Volume Change of Clays Induced by Heating as Observed in Consolidation Tests , 1993 .

[9]  Tomasz Hueckel,et al.  Thermoplasticity of Saturated Soils and Shales: Constitutive Equations , 1990 .

[10]  R. Plum,et al.  SOME TEMPERATURE EFFECTS ON SOIL COMPRESSIBILITY AND PORE WATER PRESSURE , 1969 .

[11]  K. Demars,et al.  Soil volume changes induced by temperature cycling , 1982 .

[12]  I. Towhata,et al.  TEMPERATURE EFFECTS ON UNDRAINED SHEAR CHARACTERISTICS OF CLAY , 1995 .

[13]  L. Laloui,et al.  Modélisation du comportement thermo-hydro-mécanique des milieux poreux anélastiques , 1993 .

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

[15]  L. Moritz,et al.  Geotechnical properties of clay at elevated temperatures , 1995 .

[16]  Tomasz Hueckel,et al.  Reactive plasticity for clays during dehydration and rehydration. Part 1: concepts and options , 2002 .

[17]  L. Eriksson.  Temperature effects on consolidation properties of sulphide clays , 1989 .

[18]  E. N. Bromhead,et al.  Computer methods and advances in geomechanics: G. Beer, J.R. Booker and J.P. Carter (eds) Balkema, Rotterdam, 1991, £122, (3 volumes) ISBN (Set) 90-6191-189-3 , 1993 .

[19]  Lyesse Laloui,et al.  Modelling of the thermo-hydro-plastic behaviour of clays , 2002 .