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考虑颗粒材料的宏细观力学行为对样本存在依赖性,从颗粒形状、颗粒粒径、颗粒级配、孔隙度、均匀性及细观结构等方面强调了颗粒材料离散单元模拟时对数值样本的要求.在此基础上综述了颗粒材料样本生成的规则排列方案和随机生成方案,重点描述了随机生成方案中的构造算法和动力生成技术.从计算量等方面讨论了不同方案的优缺点,并评述了不同方案生成的颗粒材料数值样本的孔隙度和级配等特征及其适用性.最后对颗粒材料数值样本生成技术的发展方向和相关研究提出了展望.
Considering that the macro-micromechanical behavior of granular materials is dependent on the sample, the particle size, particle size, particle size distribution, porosity, homogeneity and mesostructure are all emphasized in numerical simulation of discrete samples of granular materials Requirements.On the basis of the above, we summarize the rules arrangement and random generation scheme of the granular material sample generation, and focus on the construction algorithm and the power generation technology in the random generation scheme.The advantages and disadvantages of different schemes are discussed from the aspects of calculation amount and so on The characteristics of porosity and gradation of numerical samples of granular materials generated by different schemes and their applicability are reviewed.Finally, the development direction and related research of numerical sample generation technology for granular materials are put forward.