利用格形模型预测沥青混合料的等效弹性性质  

Prediction of Equivalent Elastic Properties of Asphalt Mixture with Lattice Model

作　　者：杨新华[1] 杨圣枫[1] 陈传尧[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《公路交通科技》2009年第3期7-10,21,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(10672063;10872073)

摘　　要：通过建立沥青混合料的三维随机格形模型,加载适当载荷和边界条件求解后,采用体积平均法得出混合料等效弹性性质。大量重复随机投放过程可获得沥青混合料等效弹性参量的分布,卡方检验结果表明:等效弹性模量服从正态分布,期望值处于Paul上下限之间,并且接近上限值。同时,由于骨料分布的随机性,沥青混合料不同方向等效泊松比的期望值和标准差存在很小的差异,体现出很弱的各向异性性质。随着骨料体积分数的增加,沥青混合料等效弹性模量的期望值增大,而标准差减小。骨料和沥青砂的弹性模量越接近,等效弹性模量的的标准差越小。沥青砂弹性模量的变化对沥青混合料等效弹性模量的影响最大。Equivalent elastic properties of asphalt mixture were obtained by the method of average volume after establishing the 3D random lattice model with appropriate load and boundary conditions.The equivalent elastic parameters of asphalt mixture were obtained by the repeated process of randomly casting, and the distribution of the parameters was checked by Chi-square test. The results indicate that （1） the equivalent elastic modulus is with normal distribution, and its expectation ranges from Paul＇ s bottom to top bound and approaches to the top bound; （2） the randomicity of aggregate distribution leads to small differences of expectations and standard deviations of the equivalent Poisson ratio in different directions, indicates weak anisotropy of asphalt mixture; （3） along with the increasing of volume fraction of aggregate, the expectation of the equivalent elastic modulus increases, while its standard deviation decreases; （4） the less the difference between the elastic moduli of aggregate and asphalt sand, the smaller the standard deviation of the equivalent elastic modulus. Change of elastic modulus of asphalt sand contributes most to the equivalent elastic modulus of asphalt mixture.

关 键 词：道路工程 等效弹性性质 格形模型 沥青混合料 统计分析 

分 类 号：U414[交通运输工程—道路与铁道工程]