混凝土二维细观骨料建模方法综述

Review of Two-dimensional Meso-modeling Methods of Concrete Aggregate

基于关键模拟问题调研细观建模的起源发展,从算法流程和改进措施等角度对主流建模方法进行综述.建立"干涉检查次数"和"最短路径比"指标,比较各方法建模效率和模拟效果的差异,并分析建模控制参数的影响.结果表明:是否考虑竖向堆积效应对骨料分布影响显著,导致材料耐久性能差异较大,应选择对应的算法进行模拟;密实度、长宽比等建模参数在细观研究中较为关键,需要调研实际骨料进行调整.基于建模方法的对比分析,有利于指导大尺度高精度建模方法的选取,实现模型结果归一化,使复杂的工程分析简单高效.

In this paper,the origin and the development of modeling method are studied based on critical simulation problems.The detailed process and the improvement of major methods are reviewed. The efficiency and the results of simulation are compared by introducing＂interference check indicator＂and ＂the shortest path ratio＂.It is shown that the distributions of concrete aggregate with vertical subsidence are different under gravity,which affects the durability of material and needs to be simulated by corresponding methods.The parameters including density and aspect ratio are important in mesoscopic study and should be adjusted according to practical aggregate.The review of methods can guide the selection of large-scale and high-precision modeling and normalize the results from different methods and parameters,which can simplify the complex analysis significantly.