期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 325, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126774
关键词
Aggregate; Cyclic behavior; Permanent strain; Plasticity model; Stress path; Yield surface
资金
- University of Ulsan
- NCDOT
This study proposes a physics-based modeling approach to predict the deformation behavior of aggregates in pavements. By using a two-surface plasticity theory and repeated load triaxial tests, the model accurately describes aggregates with low-level permanent strain and enables the assessment of yield surface, long-term shear strain, and path-dependent resilient modulus.
Various empirical rutting models have been proposed to predict the permanent deformation of aggregate base/ subbase layers in pavements. Nevertheless, an analytical model is required for large-scale finite element simu-lation of the pavement structure. A two-surface plasticity theory is used to predict the long-term cyclic behavior and provide path-dependent material responses of aggregates. The deviatoric stresses for each aggregate were determined based on the shear stress ratio and the shear strength properties at source and engineering grada-tions. The proposed rutting model was optimized and validated via repeated load triaxial tests using 11 aggre-gates. The numerical results demonstrate that the proposed model accurately describes aggregates with low-level permanent strain and thus enables the yield surface, long-term shear strain, and path-dependent resilient modulus to be assessed. Overall, the proposed physics-based modeling approach can help understand and predict the deformation behavior of aggregates subjected to moving-wheel loads.
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