沥青混合料动态模量试验的仿真和验证  

Simulation and verification of dynamic modulus test for asphalt mixture

作　　者：袁淼 韩丁[1] 李阳[1] 杜庆灿 YUAN Miao;HAN Ding;LI Yang;DU Qingcan(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2022年第1期67-72,80,共7页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金青年科学基金资助项目(51008109)。

摘　　要：为了能对沥青混合料单轴压缩动态模量试验进行合理的仿真,文章建立了可表征骨料截面真实形态的四相体数值试件和虚拟加载试验。通过对大量的骨料截面轮廓进行分形维数的统计分析,得到该指标的正态分布规律,并结合中点位移法重构数值试件所需的骨料截面。基于柱坐标系的特征,将圆柱形试件转化为二维试件。基于瓦拉文公式,获得对应于Fuller级配曲线的各档骨料截面待投放数目。投放生成含有骨料、沥青砂浆、孔隙和界面的四相体数值试件,依据动态模量试验工况建立虚拟试验,并将计算结果与试验数据进行了对比分析。结果表明:采用仿真试验数据获得的动态弹性模量与室内试验数据获得的结果能较好地吻合,而相位角的误差稍大;随着加载频率的增加,动态弹性模量也逐渐增大,但增幅趋缓且呈现明显的非线性特征。该文建立的沥青混合料动态模量仿真试验可作为室内试验的有益补充。In order to simulate the uniaxial compression dynamic modulus test for asphalt mixture reasonably,four-phase numerical specimen and virtual loading test,which can characterize the real shapes of aggregate sections,are individually established.Through the statistical analysis of the fractal dimension for a large number of aggregate section profiles,the normal distribution of the fractal dimension is obtained.Aggregate section profiles required by the numerical specimen are reconstructed by the midpoint displacement method and the normal distribution.Based on characteristics of the cylindrical coordinate system,the cylindrical specimen is transformed into a two-dimensional specimen.Based on the Walraven formula,numbers of different aggregate section which will be placed in the specimen using the Fuller gradation curve are obtained.The four-phase numerical specimen including aggregate,asphalt mortar,air voids and interfacial transition zone(ITZ)is generated.According to working conditions of the dynamic modulus test,a virtual test is established.The comparisons and analyses between the calculation results and the experimental data are made,and it is shown that the dynamic elastic modulus obtained from the simulated experimental results approximates to that of the laboratory experimental data.However,differences of the phase angle are slightly larger.With the increase of the loading frequency,the dynamic elastic modulus increases gradually,which shows obvious nonlinear characteristics.The dynamic modulus simulation test for asphalt mixture established in this paper can be used as a valuable supplement for the laboratory test.

关 键 词：沥青混合料 骨料截面 细观模型 动态模量 相位角 

分 类 号：U414[交通运输工程—道路与铁道工程]