基于离散元法的沥青混合料骨架细观性能研究  

Investigation into Meso Performance of Asphalt Mixture Skeleton Based on Discrete Element Method

作　　者：石立万[1] 王端宜[1] 徐驰[1] 梁何浩 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2015年第10期50-56,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51278203)~~

摘　　要：为了更深刻地了解混合料的骨架结构,为骨架密实型沥青混合料的设计提供理论依据,基于离散元法对沥青混合料骨架和主骨架的构成、骨架细观结构基本特性以及骨架应力传递性能进行了系统研究.结果表明：沥青混合料骨架的质量评价在于骨架传递应力的大小和抵抗外部荷载的能力;混合料内接触点可分为有效接触点和无效接触点,主骨架基本由相互接触的2.36 mm以上粗集料所构成;沥青玛蹄脂碎石混合料（SMA）骨架传递的应力一般为加载应力的70%～80%,骨架传递的应力比例与集料公称最大粒径成正比,与试件厚度成反比,而主骨架对骨架应力传递的贡献率达70%以上.In order to deeply understand the mixture skeleton structure and thus provide a theoretical basis for the design of the asphalt mixture of dense skeleton,the discrete element method is employed to investigate the constitution of the skeleton and the main skeleton of asphalt mixture,the basic characteristics of skeleton microstructure and the stress transfer performance of skeleton. The results indicate that（ 1） the evaluation of the asphalt mixture skeleton quality lies in the stress transfer magnitude of skeleton and its ability to resist external loads;（ 2） the contact points in the mixture can be divided into valid contact points and invalid contact points,and the main skeleton is made up of coarse aggregates which are in contact with one another and are of a particle size of greater than2. 36 mm;（ 3） the stress transferred by the SMA（ Stone Mastic Asphalt） mixture skeleton accounts for about70% ～ 80% of the loading stress;（ 4） the proportion of the stress transferred by the skeleton is proportional to the nominal maximum size of the aggregates,but it is inversely proportional to the thickness of the specimen; and（ 5）the contribution rate of the main skeleton to the skeleton stress transfer is more than 70%.

关 键 词：道路工程 沥青混合料 离散单元法 细观性能 接触点 主骨架 

分 类 号：U414.1[交通运输工程—道路与铁道工程]