摘要
针对沥青路面永久变形的预估方法进行研究。首先分析永久变形的产生机理,以剪应力作为主要力学指标,提出了路面永久变形的预测模型形式;然后,选用沥青混合料AC13作为试验级配,进行60℃单轴贯入抗剪试验、20℃模量试验及不同温度、不同荷载和不同厚度条件下的车辙试验,利用实测模量采用有限元方法计算车辙试件在不同荷载及不同厚度条件下试件内的剪应力分布;最后依据路面结构的剪应力分析结果、车辙试验以及抗剪试验结果,采用遗传算法确定路面永久变形预估模型的参数,得到基于试验数据及力学分析的沥青路面永久变形预估模型。
The paper researched on the permanent deformation evaluation method of asphalt concrete pavements. The form of evaluation model was advanced on the basis of the formation mechanism analyzing of permanent deformation, and the shear stress was used as basic mechanical index in the model. In addition, several experiments of asphalt concrete ACl3 were carried out, such as uniaxial penetration shear tests at 6012, modulus tests at 2012 and rutting tests in different sample thickness under different loads. And the shear stress distributions of different asphalt concrete samples were calculated by finite element methods with actually measured modulus. Finally, according to the shear stress analysis results and the results of rutting tests and uniaxi- al penetration shear tests, the parameters of permanent deformation evaluation equation were figured out by genetic algorithms, and the permanent deformation evaluation model was achieved based on experiments and mechanics analysis.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2008年第12期42-45,共4页
Journal of Wuhan University of Technology
基金
国家杰出青年科学基金(50325825)
关键词
永久变形
遗传算法
预估模型
抗剪
剪应力
permanent deformation
genetic algorithms
evaluation model
shear resistance
shear stress
