MODELLING OF AGEING EFFECTS ON THE ELASTO-VISCOPLASTIC BEHAVIOUR OF GEOMATERIAL

SOILS AND FOUNDATIONS

LALANA KONGSUKPRASERT⁶  TAKAHIKO NISHI³  FUMIO TATSUOKA¹  YUSUKE SANO⁵  WARAT KONGKITKUL⁴  HERVÉ DI BENEDETTO² 

[1] Department of Civil Engineering, Tokyo University of Science;Département Génie Civil et Bâtiment, Ecole Nationale des Travaux Publics de l'Etat;Japan Railway Construction, Transport and Technology Agency;Department of Civil Engineering, King Mongku's University of Technology Thonburi;Kyosei-kiko Co. Ltd.;Department of Civil Engineering, University of Tokyo, Japan and Post Doctorial Fellow, TUS

关键词: ageing effect;    constitutive modelling;    elasto-viscoplastic;    geomaterial;    rate-dependency;    stress-strain behaviour;    triaxial compression;    viscous property;    (IGC: D6/D7);   

DOI  :  10.3208/sandf.48.155

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(26)Cited-By(1)The time effects on the stress-strain behaviour of geomaterial consist of effects of loading rate and ageing. The positive ageing effects are analysed based on the results from drained triaxial compression (TC) tests on cement-mixed kaolin and well-graded gravelly soil and incorporated into a non-linear three-component model that can simulate the elasto-viscoplastic behaviour of geomaterials. The inviscid yielding is controlled by the inviscid yield stress that develops basically by irreversible straining and time elapsing following, respectively, a basic inviscid strain-hardening function and an ageing function. The inviscid yield stress may develop additionally by positive interaction between ageing and inviscid yielding following an interaction function, which expresses an additional strength gain by longer ageing at higher shear stress levels. Positive interaction effects are damaged by subsequent irreversible straining following a damage function. These functions are formulated based on experimental results. Illustrative model simulations are presented to describe the structure of the proposed model. The model is validated by simulating drained TC tests exhibiting significant effects of loading rate and ageing.

【 授权许可】

Unknown