Flow and fracture of granular materials under external loads is a complex mechanical process, and the research on its law is still in\nthe exploratory stage. In this paper, the flow and fracture law of granular materials is taken as the research object, and numerical\nalgorithm compilation and program development are combined to study. Taking full advantage of the existing algorithms and\ndeveloping new ones based on the existing DEM theory, a numerical simulation program for the flow and fracture of granular\nmaterials is developed. The flow and fracture process of concrete spherical granular system with diameter of 4 cm under loading\nrate of 70 mm/min and end of loading of 50 kN is taken as an example to verify the simulation program. At the same time, the\nloading experiment of the concrete spherical particle system under the same simulation conditions was also carried out. The\nsimulation results are compared with the experimental results in three aspects: the generation location of the particle system, the\nrelationship between the whole load and displacement, and the degree of particle breakage. The results show that the numerical\nsimulation is in good agreement with the experimental results, which verifies the reliability of the numerical algorithm and the\nsimulation program, and can provide support for the study of the flow and fracture process of granular materials.
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