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考虑到沥青混合料、粒状类基层和土质路基等材料各向异性特性对沥青路面动力学的影响,基于对各国研究现状的综合分析,采用有限元数值分析方法,在弹性假设下引入横观各向同性系数,建立沥青路面三维有限元模型;采用ABAQUS进行DLOAD子程序二次开发,实现非均布竖向移动荷载的数值模拟;并给出移动荷载作用形式、边界条件和材料参数;而后对比分析了移动荷载作用下各向同性和不同横观各向同性特性条件下三向应变场的差异。结果表明:当考虑横观各向同性特性时,目前采用的设计标准偏于危险,基于各向同性特性的路面设计低估了与永久变形和疲劳裂缝相关的应变。
Considering the influence of the anisotropic properties of asphalt mixture, granular grassroots and soil subgrade on the asphalt pavement dynamics, based on the comprehensive analysis of the research status in various countries, using the finite element numerical analysis method, To the homosexual coefficient, the three-dimensional finite element model of asphalt pavement was established. The secondary development of DLOAD subroutine was carried out by ABAQUS to realize the numerical simulation of vertical moving load with non-uniform distribution. The moving load form, boundary conditions and material parameters were given. The difference of three-dimensional strain field under isotropic and transversely isotropic conditions under moving loads is analyzed. The results show that the design criteria presently adopted tend to be dangerous when considering transversely isotropic behavior and pavement designs based on isotropic behavior underestimate the strain associated with permanent deformation and fatigue cracks.