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首页> 外文期刊>International journal of geomechanics >Nonlinear Pavement Foundation Modeling for Three-Dimensional Finite-Element Analysis of Flexible Pavements
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Nonlinear Pavement Foundation Modeling for Three-Dimensional Finite-Element Analysis of Flexible Pavements

机译：柔性路面三维有限元分析的非线性路面基础建模

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摘要

Pavement foundation geomaterials, i.e., fine-grained subgrade soils and unbound aggregates used in untreated base/subbase layers, exhibit nonlinear behavior under repeated wheel loads. This nonlinear behavior is commonly characterized by stress-dependent resilient modulus material models that need to be incorporated into finite element (FE) based mechanistic pavement analysis methods to predict more accurately the pavement resilient responses, such as stress, strain, and deformation. Many general-purpose FE programs have been used to predict such pavement responses under various traffic loading conditions while not considering properly material characterizations of the unbound aggregate base/subbase and subgrade soil layers. This paper describes the recent pavement FE modeling research efforts at the University of Illinois focused on using both the specific-purpose axisymmetric and general-purpose three-dimensional (3D) FE programs for flexible pavement analyses. To properly characterize the resilient behavior of pavement foundations, nonlinear stress-dependent modulus models have been programmed in a user material subroutine (UMAT) in the commercial general-purpose finite-element program ABAQUS. The results indicated that proper characterizations of the nonlinear stress-dependent geomaterials significantly impacted accurate predictions of critical pavement responses. The prediction ability of the developed nonlinear UMAT characterization was next validated by predicting similar pavement critical responses to those measured from field instrumented pavement test sections. Different resilient modulus models, considering both axisymmetric and 3D stress states, developed from true triaxial test data on unbound granular materials were also studied. When the intermediate principal stresses were taken into account in the 3D modulus model development unlike in the axisymmetric models, somewhat lower asphalt concrete tensile strains were obtained from 3D nonlinear FE analyses of flexible pavements with unbound aggregate bases.
机译：路面基础土工材料，即未处理的基层/基层中使用的细粒路基土壤和未结合的骨料，在重复的车轮载荷下表现出非线性行为。这种非线性行为通常以依赖于应力的弹性模量材料模型为特征，需要将其纳入基于有限元（FE）的机械路面分析方法中，以更准确地预测路面的弹性响应，例如应力，应变和变形。许多通用有限元程序已被用来预测各种交通负荷条件下的这种路面响应，而没有适当考虑未结合的骨料基层/基层和路基土层的材料特征。本文介绍了伊利诺伊大学最近的路面有限元模型研究工作，重点是同时使用专用轴对称和通用三维（3D）有限元程序进行灵活的路面分析。为了正确地表征路面基础的弹性特性，已经在商业通用有限元程序ABAQUS中的用户材料子例程（UMAT）中对非线性应力相关的模量模型进行了编程。结果表明，依赖于非线性应力的土工材料的正确表征显着影响了关键路面响应的准确预测。接下来，通过预测与从现场仪表路面测试部分测得的路面临界响应相似的路面临界响应，验证了已开发的非线性UMAT表征的预测能力。还研究了考虑到轴对称和3D应力状态的不同弹性模量模型，这些模型是根据未结合的颗粒材料的真实三轴测试数据开发的。当与轴对称模型不同时，在3D模量模型开发过程中考虑了中间主应力时，可从具有未结合骨料基础的柔性路面的3D非线性有限元分析中获得较低的沥青混凝土拉伸应变。

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