Anisotropic Aggregate Base Inputs for Mechanistic Pavement Analysis Considering Effects of Moving Wheel Loads

Seyhan, Umit; Tutumluer, Erol; Yesilyurt, Hamza

doi:10.1061/(asce)0899-1561(2005)17:5(505)

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…The resilient properties obtained from the tests could be considered to be more quasi-elastic. Seyhan and Tuturmluer (2005) investigated the directional dependency of resilient modulus and Poisson's ratio of a selected crushed aggregate. They conducted 6 constant stress path tests using an advanced triaxial apparatus.…”

Section: Anisotropymentioning

confidence: 99%

Stress-path dependency of resilient behaviour of granular materials

Liu¹,

Stolle²,

Guo³

et al. 2013

International Journal of Pavement Engineering

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The resilient modulus and Poisson's ratio of granular materials used in flexible pavement structures is highly nonlinear, stress/strain path and direction-dependent. Resilient properties are very important for realistic flexible pavement design. By far, several important aspects, such as the effect of stress path, major principal stress rotation, initial stress state and inherent fabric, on the cross-anisotropic resilient properties are not fully understood. The main objective of this thesis was to study the cross-anisotropic resilient properties of granular materials along various stress paths from both initial isotropic and initial anisotropic stress states. Extensive resilient modulus stress path tests were performed for this purpose.In this research, the resilient behaviour of the test material for initial isotropic stress states along various stress paths was investigated first, with particular interest in the stress/strain path dependency. New resilient modulus equations were then developed, by taking into account the effect of confining pressure and resilient strains. These equations can be used to estimate the cross-anisotropic resilient modulus corresponding to initial isotropic stress states. Selection of Poisson's ratio was also investigated.The effect of initial stress state on the resilient responses was studied through a series of stress path tests with constant confining pressure and constant vertical stress, respectively. Based on the experimental findings, revised equations for resilient modulus and Poisson's ratio were proposed to account for the effect of ratio of initial horizontal stress to vertical stress (Kini). The proposed eq~ations can predict the cross-anisotropic 111 resilient properties for various stress paths corresponding to initial isotropic/anisotropic stress conditions.In order to provide a more comprehensive insight into the complex resilient properties of granular materials along different stress/strain paths for various initial stress states, a micromechanics approach was introduced to back-calculate the degree of fabric anisotropy. The variations of fabric with stress path, initial stress state and final stress state (i.e., state which corresponds to the peak stress during cyclic loading) were investigated. To provide a reliable prediction of initial/inherent fabric anisotropy and fabric evolution in constitutive s with embedded microstructure, an evolution law of fabric anisotropy was developed.

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Section: Anisotropymentioning

confidence: 99%

Stress-path dependency of resilient behaviour of granular materials

Liu¹,

Stolle²,

Guo³

et al. 2013

International Journal of Pavement Engineering

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“…In 1980, Boyce presented some basis for subsequent work on the stress-dependent modeling of the resilient response of cyclically loaded unbound granular materials. The anisotropy of the pavement materials is increasingly being recognized as a property that must be modeled to adequately describe the pavement mechanical behavior [32]. The Boyce model was modified to include the anisotropy in the early 1990s [21].…”

Section: Boyce Modelmentioning

confidence: 99%

Unsaturated resilient behavior of a natural compacted sand

Nowamooz¹,

Chazallon²,

Arsenie³

et al. 2011

Computers and Geotechnics

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Granular materials are generally used in unbound layers of road pavement structures. The mechanical behavior of these materials is widely studied with repeated load triaxial tests (RLTT) in which the elastic response is defined as the resilient behavior. Usually observed under total stress conditions, the effect of pore pressure changes during loading are not usually included in design. Further, the unbound layers frequently exist under partially saturated conditions. The influence of the unsaturated state, i.e., the suction, on the mechanical behavior, of unbound granular materials for roads has not been sufficiently studied and is generally not taken into account in models used for these materials. This article presents an experimental study of the repeated load response of a compacted clayey natural sand, and describes a model for the response which includes the effects of soil suction. The response of the proposed model formulated in terms of effective stress is compared with a similar model formulated in terms of total stress. The results from both the effective stress model and the total stress model are compared with the measured volumetric and deviatoric response. It is suggested that since the model parameters for the effective stress formulation are relatively constant for all values of suction (water content), the resilient response can be best captured by an effective stress model

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“…Then, the dynamic moduli of the AC samples along the vertical and longitudinal directions were measured by Motola and Ozan [14], showing that the longitudinal moduli and stiffness were 40% and 30% of that in vertical. Also, the vertical modulus and out-of-plane Poisson's ratio were higher than the longitudinal modulus and in-plane Poisson's ratio, respectively [15]. Moreover, Alanazi et al [16] stated that the anisotropy decreased with the increasing density.…”

Section: Introductionmentioning

confidence: 97%

Impacts of Material Orthotropy on Mechanical Behaviors of Asphalt Pavements

et al. 2021

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Material anisotropy significantly impacts the mechanical behaviors of asphalt pavements. However, most current asphalt pavement design methods treat the material properties only as isotropic, which could significantly skew the mechanical behaviors. There is a need to evaluate the impact of material anisotropy on pavement mechanical behaviors. In this study, we first developed a new and efficient 3-dimensional finite element (FE) model of anisotropic material. Then, the feasibility of the proposed FE model was verified using field data collected with a falling weight deflectometer. Finally, using this model, the contributions of each layer anisotropy to the mechanical properties were determined. The results showed that the mechanical behaviors were more sensitive to the orthotropy than to the transverse isotropy of the material. The all-layer orthotropy was the most unfavorable combination. In addition, the subgrade orthotropy showed the most significant effect on increasing the surface deflection and compressive strain of the subgrade top (by about 10%). Based on the study results, we recommend that the homogeneity degree of the filling subgrade should be strictly controlled to ensure adequate pavement capacity and anti-rutting performance during construction.

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Anisotropic Aggregate Base Inputs for Mechanistic Pavement Analysis Considering Effects of Moving Wheel Loads

Cited by 12 publications

References 10 publications

Stress-path dependency of resilient behaviour of granular materials

Stress-path dependency of resilient behaviour of granular materials

Unsaturated resilient behavior of a natural compacted sand

Impacts of Material Orthotropy on Mechanical Behaviors of Asphalt Pavements

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