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<p>To study the influence of different loading angles on the fracture evolution and mechanical properties of Brazilian discs with a central joint, the finite-discrete element method (FDEM) was used to investigate Brazilian discs with four different central joints under six loading angles. The fracture evolution and deformation failure characteristics of Brazilian disc models with a central joint under different loading conditions were compared and analyzed to explore the influence mechanisms of the effects of the loading angles and central joints on the fracture pattern and tensile strength of Brazilian discs. Research showed that the range of the influence of the vertical stress along the loading direction on Brazilian discs with a central joint during the elastic response phase is greater than that of the horizontal stress. At the same loading conditions, the vertical stress along the loading diameter of Brazilian discs with a central joint significantly decreased, and it gradually decreases with increasing inclination angle of the central joint. The change in loading angle affects the initiation and propagation direction of cracks in Brazilian discs with central joints. As the loading angle increases, the fracture process of Brazilian discs with central joints is accompanied by the development of boundary cracks. The tensile failure modes of Brazilian disc with central joint can be divided into three types: breaking-tension, dislocation-tension and deflection-tension. In the dislocation-tension failure mode, the unloading time of the disc is dominated by the joint angle. In the breaking-tension and deflection-tension failure modes, the stress curve of the disc exhibits a double peak as the loading angle increases. According to the propagation mode, the tensile cracks in the Brazilian test can be divided into two types. Type A is the tensile crack guided by the reverse displacement of the rock mass on both sides. Type B is a secondary tensile crack guided by the displacement difference caused by the same displacement of the rock mass on both sides. The non—direct connection between tensile cracks is the main reason for the spalling of tensile fracture surfaces to varying degrees.</p>

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FDEM Analysis of Fracture Evolution in Brazilian Tests with Central Joints Under Varying Loading Conditions

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Feng Luo,
  • Shuai Gao,
  • Jiaqi Hu,
  • Peng Wang,
  • Meng Li,
  • Enyuan Dong

摘要

To study the influence of different loading angles on the fracture evolution and mechanical properties of Brazilian discs with a central joint, the finite-discrete element method (FDEM) was used to investigate Brazilian discs with four different central joints under six loading angles. The fracture evolution and deformation failure characteristics of Brazilian disc models with a central joint under different loading conditions were compared and analyzed to explore the influence mechanisms of the effects of the loading angles and central joints on the fracture pattern and tensile strength of Brazilian discs. Research showed that the range of the influence of the vertical stress along the loading direction on Brazilian discs with a central joint during the elastic response phase is greater than that of the horizontal stress. At the same loading conditions, the vertical stress along the loading diameter of Brazilian discs with a central joint significantly decreased, and it gradually decreases with increasing inclination angle of the central joint. The change in loading angle affects the initiation and propagation direction of cracks in Brazilian discs with central joints. As the loading angle increases, the fracture process of Brazilian discs with central joints is accompanied by the development of boundary cracks. The tensile failure modes of Brazilian disc with central joint can be divided into three types: breaking-tension, dislocation-tension and deflection-tension. In the dislocation-tension failure mode, the unloading time of the disc is dominated by the joint angle. In the breaking-tension and deflection-tension failure modes, the stress curve of the disc exhibits a double peak as the loading angle increases. According to the propagation mode, the tensile cracks in the Brazilian test can be divided into two types. Type A is the tensile crack guided by the reverse displacement of the rock mass on both sides. Type B is a secondary tensile crack guided by the displacement difference caused by the same displacement of the rock mass on both sides. The non—direct connection between tensile cracks is the main reason for the spalling of tensile fracture surfaces to varying degrees.