为了探究混凝土内部细观尺度下的损伤机理，利用Python语言对ABAQUS进行二次开发，建立了包含界面过渡区的三维细观凹凸型骨料混凝土模型，并提出了一种可直接用于判断凹凸型骨料空间干涉的方法。随后，对该模型进行准静态下的数值模拟，以验证其可靠性。最后，进行了不同骨料形状下的单轴压缩数值模拟分析。研究结果表明，采用本方法可以实现60%以上的骨料体积比的高密实投放。在不同形状的骨料下，混凝土的抗压强度方面影响不大；然而，在导致混凝土裂缝扩展与体积破坏方面，不同形状的骨料产生较大影响。随着骨料表面凹凸性和不规则程度的增加，混凝土受压时的损伤破坏程度逐步加深。这些发现有助于更深入地理解混凝土内部损伤机理，并为混凝土结构设计提供了有益的参考。

To explore the internal damage mechanisms of concrete at the meso-scale level, ABAQUS was conducted secondary development using the Python language. A three-dimensional meso-scale model of concrete with concave-convex aggregates, including the interfacial transition zone, was established. Additionally, a method for directly determining spatial interference of concave-convex aggregates was proposed. Subsequently, the model underwent numerical simulations under quasi-static conditions to validate its reliability. Finally, numerical simulations of uniaxial compression were performed for different aggregate shapes. The results indicate that this method can achieve high-density placement with an aggregate volume fraction of over 60%. The influence on concrete compressive strength is minimal for different aggregate shapes. However, significant effects were observed in terms of inducing crack propagation and volumetric failure in concrete. As the surface concavity-convexity and irregularity of aggregates increase, the degree of compressive damage and failure in concrete progressively deepens. These findings contribute to a more profound understanding of internal damage mechanisms in concrete, providing valuable insights for the design of concrete structures.