中文摘要：

混凝土的细观力学分析中，将混凝土考虑为由粗骨料、水泥砂浆以及界面三相所组成的复合材料。细观分析时粗骨料模型的建立是一个主要而且关键的步骤。在二维分析中，圆形骨料是应用最为广泛的简化模拟方法；而椭圆形骨料以及多边形骨料也分别被用来模拟卵石骨料以及碎石骨料。针对圆形、椭圆形以及多边形这三种剖面形状的骨料，确定了简化的骨料随机生成方法，生成了相应的几何模型，并得出了数值模拟结果。

英文摘要：

In meso-scale analysis, the concrete material is assumed to be a composite material consisting of coarse aggregates, mortar matrix, and an interfacial transition zone. Generation of coarse aggregate is a key step in meso-scale simulation. Circular aggregate shape is the most widely used and the most simplified method in two-dimensional （2D） simulation, while oval and polygonal shaped models are also used to analyze the gravel and crushed stone aggregates. In the present paper, simplified method is used to generate stochastic circular, oval and polygonal shapes; corresponding geometric models are built to model different aggregate. Numerical results are also given.