沥青路面结构两款轴对称非线性有限元分析软件应用之比较

Application Comparisons of Two Axisymmetric Nonlinear Finite Element Analysis Programs for Asphalt Pavement Structures

选取两款用于沥青路面结构分析的典型轴对称非线性有限元软件MICH-PAVE和ILLI-PAVE,从应用层面对二者开展横向比较,并以级配碎石柔性基层沥青路面结构为算例,分析二者关键力学响应结果的差异性。结果表明:两款软件在前处理、计算求解、后处理等方面均存在差异,需根据实际情况合理选用;二者均可考虑粒料和细粒土回弹模量对应力状态的依赖性;两款软件计算所得路表弯沉、沥青面层底径向应变及土基顶面竖向应变的分布形态相似,MICH-PAVE所获结果较ILLI-PAVE总体偏大,二者所获沥青面层底径向应变、土基顶面竖向应变的吻合程度高于路表弯沉。

Two typical axisymmetric nonlinear finite element programs,namely,MICH-PAVE and ILLI-PAVE,used for mechanical analysis of asphalt pavement structures are selected and compared from an application level.Based on an example-asphalt pavement structure with an unbound graded aggregate flexible base,the differences in critical mechanical response between the two programs are presented.The results show that some differences exist in terms of pre-processing,calculation,and post-processing between the two programs and that the most suitable program should be selected based on the actual situation.Both programs can consider the dependence of resilient moduli of granular materials and fine-grained soil materials on the stress state.Results showed that the distribution of surface deflection,radial strain at the bottom of the asphalt surface layer,and vertical strain on the top of the subgrade obtained from the two programs were similar.Overall,the results obtained from MICH-PAVE were larger than those of ILLI-PAVE,whereas the coincidence degree of radial strain at the bottom of the asphalt surface layer and vertical strain on the top of the subgrade was better than that of surface deflection with the two programs.