新型柔性路面结构非线性分析方法研究

Research on Nonlinear Analysis Method of a New Flexible Pavement

为预测敷设于松软泥泞地基之上的柔性路面在车辆荷载下的静力性能,选取DuncanChang本构模型模拟地基土体非线性弹性力学特性,将柔性路面结构简化为膜-梁单元力学模型。考虑路面结构受载大变形、地基与路面的接触非线性,采用有限元分析软件Abaqus建立柔性路面结构的非线性分析模型,得出了路面结构受载后变形和内力响应等结果,并通过实载试验验证了数值分析结果的准确性。结果表明,基于Duncan-Chang本构模型的路面结构非线性分析方法能够满足工程分析要求。

In order to predict the static mechanical performance of flexible pavement laid on swampy ground under vehicle load,Duncan-Chang constitutive model is selected to simulate the nonlinear elastic properties of ground soil. The flexible pavement is simplified as a mechanical model of membrane-beam element,and the large deformation and contact nonlinearity of flexible pavement are also consisted. A nonlinear analysis model of flexible pavement structure is established by using the finite element analysis software ABAQUS,and the deformation and internal force response of the flexible pavement under load are obtained. The numerical analysis result is verified with the load test result. The result shows that the nonlinear analysis method of flexible pavement structure based on Duncan-Chang constitutive model can meet the requirements of engineering analysis.