开级配大粒径沥青碎石OLSM-25细观结构的离散元分析初探  

Preliminary discrete element analysis on mesostructure of open-graded large stone asphalt mixes(OLSM-25)

作　　者：郭红兵[1,2] 赵亚兰[1,2] 陈拴发[3] 

机构地区：[1]陕西交通职业技术学院公路工程系,陕西西安710018 [2]长安大学公路学院,陕西西安710064 [3]长安大学材料学院,陕西西安710064

出　　处：《河北工业大学学报》2015年第5期90-96,共7页Journal of Hebei University of Technology

基　　金：陕西省教育厅专项科研计划(14JK1067);中央高校基本科研业务费专项资金(CHD 2010JC011)

摘　　要：沥青混合料是由沥青和粗细集料等粒状单元共同组成的多相复合材料,目前现有的沥青路面结构设计理论均将路面结构当作均匀连续、各向同性的弹性体进行计算分析,这与沥青混合料自身属于颗粒体非连续微细观结构的实际情况不相符.本文采用离散元方法,运用二维颗粒流程序(PFC2D),对比分析了两种颗粒生成方法的特点及其适用条件,以开级配大粒径沥青碎石混合料(Open-graded Large Stone Asphalt Mixes,OLSM)OLSM-25推荐级配的上限为1#级配,建立了1#级配OLSM-25混合料的二维离散元模型,验证了二维离散元方法用于沥青混合料颗粒体材料数值模拟的可行性,弥补了有限元方法的不足之处,为OLSM-25的细观结构分析开辟了新的解决思路和途径.Asphalt mixture is a kind of multiphase composite material composed of granular cells such as asphalt, coarse aggregate and fine aggregate, in the existing structural design theory of asphalt pavement at present, asphalt pavement structure has been taken as an uniform continuous, isotropic and elastic body to be analysed and calculated, which is inconsistent with the fact that asphalt mixture belongs to the discontinuous particles microstructure. In this paper, by using of the discrete element method and the two-dimensional particle flow code （PFC^2D）, comparative analysis on the characteristics and its applicable conditions have been done for two kinds of particles generation methods, the upper limit of the recommended gradation range of Open-graded Large Stone Asphalt Mixes （OLSM-25） has been taken as 1# gradations, the two-dimensional discrete element model of 1# gradation of OLSM-25 mixes has been established, therfore, it verified that the two-dimensional discrete element method is feasible for the numerical simulation of asphalt mixes composed of particle materials, and made up the deficiencies of finite element method, all of these provide a new idea and solution to do analysis on mesostructure of OLSM-25.

关 键 词：道路工程 开级配大粒径沥青碎石 细观结构 离散元法 数值分析 

分 类 号：U414.1[交通运输工程—道路与铁道工程]