沥青路面分析中的非线性问题应用

Application of Nonlinear Problems in Asphalt Pavement Analysis

沥青路面是我国公路尤其是高等级公路的主要形式。在沥青路面相关的力学分析中存在大量的非线性问题。本文对沥青路面分析中涉及到的材料非线性问题(包含沥青混合料的粘弹性与粘塑性本构模型)、几何非线性问题(大变形问题)进行探讨,并结合有限元软件对相关非线性问题对相关知识进行应用。研究结果表明:在沥青混合料的力学分析中,考虑材料的非线性能够更准确的描述材料的力学性质,而三轴应力条件下,尤其是较严重的车辙发生时,路表附近的应力计算需要考虑几何非线性。

Asphalt pavement is the main form of highway in China, especially high-grade highway. There are a large number of nonlinear problems in the mechanical analysis related to asphalt pavements. Combined with the course, this paper discusses the material nonlinear problems (in-cluding viscoelastic and viscoplasticinstantonal models of asphalt mixtures), geometric nonlinear problems (large deformation problems) involved in the analysis of asphalt pavements, and the ap-plication of related knowledge to the relevant nonlinear problems with finite element software. The results show that considering material nonlinearity in the mechanical analysis of asphalt mixtures can more accurately describe the mechanical properties of the material, while the calculation of stresses near the road surface under triaxial stress conditions, especially when more severe rutting occurs, requires consideration of geometric nonlinearity.