基于粗集料形状特征的沥青混合料三维数字试件生成

发布时间：2018-06-26 07:54

本文选题：沥青混合料 + 三维数字试件　；参考：《东南大学学报(自然科学版)》2017年04期

【摘要】：为了准确地模拟沥青混合料相关试验,节省集料和试验设备等方面的成本,通过离散单元法模拟生成沥青混合料三维数字试件.采用中心球扩散方法构建出粗集料的扁平比与棱角性,通过调节不同粗集料模型的百分比来获得和实际相近的粗集料形状组合,并用一定质量的虚拟粗集料"clump"球体块取代同样质量的等效球体来表征粗集料级配特征,通过删除砂浆球体单元来模拟出空隙率特征,最终建立沥青混合料三维离散元模型.研究表明,沥青混合料三维数字试件可以很好地模拟粗集料的三维空间形状,准确表征粗集料的扁平比与棱角性特性,同时能够精确显示粗集料的级配特点与空隙分布,达到以虚拟试件代替真实试件进行试验的目的.
[Abstract]:In order to accurately simulate the correlation test of asphalt mixture and save the cost of aggregate and test equipment, the three-dimensional digital specimen of asphalt mixture is simulated by the discrete element method. The flat ratio and angle of the coarse aggregate are constructed by the center ball diffusion method, and the actual phase is obtained by adjusting the percentage of the different coarse aggregate model. Close coarse aggregate shape is combined, and a certain quality virtual coarse aggregate "clump" ball is used to replace the equivalent mass of the same mass to characterize the coarse aggregate gradation characteristics. A three-dimensional discrete element model of the asphalt mixture is established by deleting the mortar ball element and finally establishing the three-dimensional discrete element model of the asphalt mixture. It can well simulate the three-dimensional space shape of coarse aggregate, accurately characterize the flat ratio and angular characteristic of coarse aggregate, and can accurately display the gradation characteristics and space distribution of coarse aggregate, and achieve the purpose of replacing the real specimen by virtual specimen.
【作者单位】：南京航空航天大学航空宇航学院;
【基金】：国家科技支撑计划资助项目(2015BAL02B02) 江苏省重点研发计划资助项目(BE2015349)
【分类号】：U414

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