基于离散单元方法的多孔沥青混合料级配比选  

Comparison and selection of gradation for porous asphalt concrete based on discrete element method

作　　者：蒋玮[1] 沙爱民[1] 肖晶晶[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064

出　　处：《吉林大学学报（工学版）》2011年第1期68-72,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：'十一五'国家科技支撑计划项目(2006BAJ18B05)

摘　　要：应用离散单元方法结合PFC2D软件,对多孔沥青混合料的级配进行了评价,建立了细观尺度上的直观离散元数值模型,构建了粗细两种级配的PAC-13多孔沥青混合料骨架结构二维模型,进行了结构稳定性虚拟试验。仿真结果表明,相同空隙率条件下,PAC-13粗型级配的骨架结构比细型级配更稳定,结构承载力和抵抗局部变形的能力更佳。同时进行了相关室内试验的验证,与模拟结果一致,证明了本文方法的有效性。Applying the discrete element method （DEM）, combined with the software PFC^2D, the evaluation of the porous asphalt eoncrete（PAC） was performed. An intuitive DEM on the microscopic scale was built and a 2-D model was established for the porous asphalt concrete PAC -13 framework structure with coarse or fine gradation. The virtual tests on the structure stability were done. The simulation results showed that, with the same void ratio, PAC -13 with coarse gradation is characterized by a better framework structure stability, a better load capacity, and a better resistance to local deformation than those of the fine gradation. The simulation results were validated by the laboratory experiments, implicating the DEM provides a technique for further study of PAC design and comparison.

关 键 词：道路工程 级配比选 离散单元方法 多孔沥青混合料 虚拟试验 

分 类 号：U416.217[交通运输工程—道路与铁道工程]