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为研究沥青混合料的骨架特征与其剪切模量的关系,基于数字图像技术实现粗集料接触特性分析,提出以平均半径r作为混合料粗细集料分界点的动态划分方法,确定以最小计算粒径的23%作为接触阈值,结合散体力学理论与数字图像技术实现剪切模量预估模型的修正。结果表明:基于散体力学理论的均匀应变模型与静力学模型均能准确估算材料的剪切模量;剪切模量G′较抗剪强度τD更能反映沥青混合料的抗车辙性能;单元面积内接触点数量S1可作为衡量集料空间特性的指标;沥青性能决定了集料切向弹性刚度ks与量纲一的刚度比值λ,同种沥青的混合料λ值基本相同。
In order to study the relationship between the skeleton characteristics of asphalt mixture and its shear modulus, the contact characteristics of coarse aggregate were analyzed based on digital image technology. The average radius r was used as the dynamic division method for the cut-off point of the aggregate, 23% of the particle size is used as the contact threshold, and the correction of the shear modulus prediction model is realized by combining the theory of bulk mechanics and digital image technology. The results show that both the uniform strain model and the static model based on the theory of bulk mechanics can accurately estimate the shear modulus of the material. The shear modulus G ’can better reflect the rutting resistance of the asphalt mixture than the shear strength τD. The number S1 of contact points in the area can be used as an index to measure the spatial characteristics of the aggregate. The asphalt property determines the rigidity ratio k of the aggregate tangential stiffness and the rigidity ratio λ of the dimension one. The λ values of the same kind of asphalt mixture are basically the same.