TY - GEN
T1 - Investigation of pavement foundation behavior using axisymmetric and three-dimensional finite element analyses
AU - Kim, M.
AU - Tutumluer, E.
PY - 2007
Y1 - 2007
N2 - Pavement foundation geomaterials, i.e. unbound aggregates used in untreated base layers and fine-grained soils of subgrade layers, exhibit nonlinear behavior under repeated wheel loads. Stress-dependent resilient modulus models, commonly used to characterize this nonlinear behavior, were programmed in a User Material Subroutine (UMAT) in the general-purpose finite element (FE) program ABAQUS™ to analyze flexible pavements in both axisymmetric and three-dimensional (3D) stress systems with the intention to study predicted pavement responses, i.e., stress, strain and deformation. Different modulus models considering both axisymmetric and 3D stress states were developed from true triaxial test data on unbound granular materials. Pavement response predictions were then compared from different FE analysis cases studied using these nonlinear characterization models. When the intermediate principal stresses were taken into account in the modulus model development, the most accurate pavement response predictions were obtained from 3D nonlinear FE analyses of flexible pavements with unbound aggregate bases.
AB - Pavement foundation geomaterials, i.e. unbound aggregates used in untreated base layers and fine-grained soils of subgrade layers, exhibit nonlinear behavior under repeated wheel loads. Stress-dependent resilient modulus models, commonly used to characterize this nonlinear behavior, were programmed in a User Material Subroutine (UMAT) in the general-purpose finite element (FE) program ABAQUS™ to analyze flexible pavements in both axisymmetric and three-dimensional (3D) stress systems with the intention to study predicted pavement responses, i.e., stress, strain and deformation. Different modulus models considering both axisymmetric and 3D stress states were developed from true triaxial test data on unbound granular materials. Pavement response predictions were then compared from different FE analysis cases studied using these nonlinear characterization models. When the intermediate principal stresses were taken into account in the modulus model development, the most accurate pavement response predictions were obtained from 3D nonlinear FE analyses of flexible pavements with unbound aggregate bases.
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M3 - Conference contribution
AN - SCOPUS:84863240567
SN - 9780415448802
T3 - Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
SP - 389
EP - 399
BT - Advanced Characterisation of Pavement and Soil Engineering Materials - Proceedings of the International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
T2 - International Conference on Advanced Characterisation of Pavement and Soil Engineering Materials
Y2 - 20 June 2007 through 22 June 2007
ER -