Modeling of Pavement Response Using Nonlinear Cross-Anisotropy Approach

Oh, Jong‐Min; Lytton, Robert L.; Fernando, Emmanuel G

doi:10.1061/(asce)0733-947x(2006)132:6(458)

Cited by 41 publications

(18 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The generalized Hooke's law is used to define the crossanisotropic behaviour of UGM for an axisymmetric problem, which is shown in Equation 1 [3]. …”

Section: Constitutive Model For Unsaturated Granular Materialsmentioning

confidence: 99%

“…A number of recent studies have revealed that the UGM exhibits the nonlinear cross-anisotropic behaviour, which means the resilient modulus of the granular base is stress-dependent, and its horizontal modulus is smaller than the vertical modulus [1][2]. It was found that modeling the UGM as a cross-anisotropic material can significantly reduce or eliminate the tensile stresses in base layer [3][4]. Field studies further concluded that the nonlinear crossanisotropic model provided better agreement with the field measurements [5][6].…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Modeling of unsaturated granular materials in flexible pavements

Luo

Zhang

et al. 2016

E3S Web Conf.

View full text Add to dashboard Cite

Abstract. The unsaturated granular material (UGM) is found to exhibit the moisture-sensitive and stress-dependent nonlinear cross-anisotropic behaviour in flexible pavements. This paper aims at developing a finite element (FE) model for pavement structure, which takes into account this behaviour of UGM. First, the Lytton model is employed to characterize the moisture-sensitive and stress-dependent behaviour of UGM, which incorporated a matric suction term to the existing stress-dependent constitutive model. The Lytton model is validated by the laboratory resilient modulus tests on the selected UGMs at different moisture contents. Second, the nonlinear cross-anisotropic constitutive equation of UGM is derived from the generalized Hooke's Law. The coefficients of the constitutive model are determined by the rapid triaxial test. Third, a User-Defined Material (UMAT) subroutine is developed to characterize this constitutive behaviour in the FE software ABAQUS. The UMAT subroutine adopts the secant stiffness approach with multiple damping factors. The UMAT subroutine is then implemented in the FE model of flexible pavement structures. The FE simulation results indicate the nonlinear cross-anisotropic model predicts greater pavement responses than the isotropic model. When the UGM is suction sensitive, it is found that the moisture content of UGM significantly affects the moduli distribution of base layer and the critical strains (i.e., tensile strain at the bottom of asphalt concrete, and compressive strains in base and subgrade layers) of pavement structures.

show abstract

“…The generalized Hooke's law is used to define the crossanisotropic behaviour of UGM for an axisymmetric problem, which is shown in Equation 1 [3]. …”

Section: Constitutive Model For Unsaturated Granular Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Modeling of unsaturated granular materials in flexible pavements

Luo

Zhang

et al. 2016

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…Thicknesses and layer modulus were determined from field testing using GPR and FWD. Remaining typical material properties were extracted from the previous study conducted by Fernando et al (2006). The materials were analyzed for drained behavior without any pore water pressure changes.…”

Section: Supplemental Numerical Analysismentioning

confidence: 99%

“…Generated mesh for geogrid reinforced pavement the layer, h = thickness of the layer, ε 0 /ε r , β, ρ = material properties. For three parameters ε 0 /ε r , β, ρ obtained from the permanent deformation laboratory test, the following typical values were used based on previous study (Oh et al, 2006). For this analysis, the average vertical strain was obtained at the center of loaded area that generally yields the most critical pavement response.…”

Section: Supplemental Numerical Analysismentioning

confidence: 99%

Investigation of Geogrid-Reinforced Flexible Pavement Performance over Expansive Clay

Oh¹

2011

Journal of Korean Society of Hazard Mitigation

Self Cite

View full text Add to dashboard Cite

Geogrid-reinforcement is often used in conjunction with unbound base layers (i.e., within the layer or as a subgrade/base interface layer) as a means for enhancing the performance of flexible pavements. In this study, a forensic investigation was conducted on a flexible pavement section in Texas to evaluate the influence of geogrid-reinforcement on pavement performance via field and laboratory experimental programs along with numerical analyses. It was evident that load bearing capacity of geogrid-reinforced segment tended to improve by exhibiting higher resilient moduli of unbound layers through dynamic cone penetrometer (DCP) test. Despite of obtaining high swelling and shrinkage potential of expansive subgrade soils due to moisture change from the laboratory test, field survey indicates that geogrid-reinforcement segment performs superior to the control segment along with less longitudinal cracks and lower international roughness index. In addition, numerical analyses validated the effectiveness of geogridreinforcement by yielding longer service lives with respect to rutting. This forensic investigation limitedly affirms that geogridreinforcement can effectively enhance pavement performance by mitigating movement of expansive clay.

show abstract

“…For example, the isotropic modeling of pavements may lead to an underestimation of tensile and shear stresses associated with permanent deformation and fatigue cracking assessments (Wang et al 2005). Another example is that the rutting depth of field asphalt pavements were underestimated by using an isotropic constitutive modeling (Oh et al 2006).…”

Section: Introductionmentioning

confidence: 99%

A generalized Drucker–Prager viscoplastic yield surface model for asphalt concrete

et al. 2014

View full text Add to dashboard Cite

A Generalized Drucker-Prager (GD-P) viscoplastic yield surface model was developed and validated for asphalt concrete. The GD-P model was formulated based on fabric tensor modified stresses to consider the material inherent anisotropy. A smooth and convex octahedral yield surface function was developed in the GD-P model to characterize the full range of the internal friction angles from 0 to 90 degrees. In contrast, the existing Extended Drucker-Prager (ED-P) was demonstrated to be applicable only for a material that has an internal friction angle less than 22 degrees.Laboratory tests were performed to evaluate the anisotropic effect and to validate the GD-P model. Results indicated that 1) the yield stresses of an isotropic yield surface model are greater in compression and less in extension than that of an anisotropic model, which can result in an under-prediction of the viscoplastic deformation; and 2) the yield stresses predicted by the GD-P model matched well with the experimental results of the octahedral shear strength tests at different normal and confining stresses. By contrast, the ED-P model over-predicted the octahedral yield stresses, which can lead to an under-prediction of the permanent deformation. In summary, the rutting depth of an asphalt pavement would be underestimated without considering anisotropy and convexity of the yield surface for asphalt concrete. The proposed GD-P model was demonstrated to be capable of overcoming these limitations of the existing yield surface models for the asphalt concrete.

show abstract

Modeling of Pavement Response Using Nonlinear Cross-Anisotropy Approach

Cited by 41 publications

References 10 publications

Modeling of unsaturated granular materials in flexible pavements

Modeling of unsaturated granular materials in flexible pavements

Investigation of Geogrid-Reinforced Flexible Pavement Performance over Expansive Clay

A generalized Drucker–Prager viscoplastic yield surface model for asphalt concrete

Contact Info

Product

Resources

About