MODELLING AND SIMULATION OF RATE-DEPENDENT STRESS-STRAIN BEHAVIOUR OF GRANULAR MATERIALS IN SHEAR

SOILS AND FOUNDATIONS

SHOHEI KAWABE¹  ANTOINE DUTTINE¹  FUMIO TATSUOKA¹  WARAT KONGKITKUL³  HERVÉ DI BENEDETTO²  TADAO ENOMOTO⁴ 

[1] Department of Civil Engineering, Tokyo University of Science;Département Génie Civil et Bâtiment, Ecole Nationale des Travaux Publics de l'Etat;Department of Civil Engineering, King Mongkut's University of Technology Thonburi;Public Works Research Institute

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

DOI  :  10.3208/sandf.48.175

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(41)A constitutive modelling of the elasto-viscoplastic stress-strain behaviour of geomaterials in shear that has been developed within a non-linear three-component model framework is validated by simulating a comprehensive series of drained triaxial compression (TC) and direct shear (DS) tests on a wide variety of granular materials. Illustrative simulations of rate-dependent stress-strain behaviour of geomaterial under typical laboratory test conditions were performed to analyse the structure of the model. The versatility of the proposed model and its applicability to a wide variety of shear loading histories is examined and demonstrated by these simulations. The following results are shown. Commonly with different basic viscosity types, Isotach, TESRA and P&N, the viscous stress component has a positive component that increases with an increase in the irreversible strain rate, which makes feasible stable and realistic simulations of rate-dependent stress-strain behaviour, including creep deformation, based on the proposed model. With different unbound granular material types having similar relative densities, the creep strain in TC tests and creep shear displacement in DS tests that develop by sustained loading at a given shear stress level for a given period tends to decrease with an increase in the particle roundness. This trend of behaviours is explained by a decrease in the viscosity type parameter, θ, associated with an increase in the particle roundness based on the simulations of these tests.

【 授权许可】

Unknown