Breakage of particles will have greatly influence on mechanical behavior of granular material (GM) under external loads, such as ballast, rockfill and sand. The discrete element method (DEM) is one of the most popular methods for simulating GM as each particle is represented on its own. To study breakage mechanism of particle breakage, a cohesive contact mode is developed based on the GPU accelerated DEM code - Blaze-DEM. A database of the 3D geometry model of rock blocks is established based on the 3D scanning method. And an agglomerate describing the rock block with a series of non-overlapping spherical particles is used to build the DEM numerical model of a railway ballast sample, which is used to the DEM oedometric test to study the particles’ breakage characteristics of the sample under external load. Furthermore, to obtain the meso-mechanical parameters used in DEM, a black-analysis method is used based on the laboratory tests of the rock sample. Based on the DEM numerical tests, the particle breakage process and mechanisms of the railway ballast are studied. All results show that the developed code can better used for large scale simulation of the particle breakage analysis of granular material.

颗粒的破碎将严重影响粒状材料（GM）在外部负载（例如压载物，堆石和沙子）下的机械性能。离散元素法（DEM）是模拟GM的最流行方法之一，因为每个粒子都单独表示。为了研究颗粒破裂的破裂机理，基于GPU加速的DEM代码-Blaze-DEM开发了一种内聚接触模式。基于3D扫描方法，建立了岩石块的3D几何模型数据库。并用描述一系列不重叠球形颗粒的岩石块的凝聚体建立了铁路道sample样品的DEM数值模型，该模型用于DEM测压测试以研究颗粒在外部环境下的破损特性。加载。此外，为了获得DEM中使用的细观力学参数，基于岩石样品的实验室测试，采用了黑色分析方法。在DEM数值试验的基础上，研究了铁路道ball的颗粒破碎过程及机理。所有结果表明，所开发的代码可以更好地用于颗粒材料颗粒破损分析的大规模模拟。