基于离散单元方法的多孔沥青混合料级配比选

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...

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

Applying the discrete element method(DEM), combined with the software PFC2D, the evaluation of the porous asphalt concrete(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.