To investigate the strength and failure characteristics of rock mass, 3D discrete element method (DEM) is used in this study to conduct numerous simulated true triaxial compression tests on jointed marble. Three series of tests are carried out to study the influence of the intermediate principal stress and the joint inclined angle on the macroscopic mechanical characteristics. The DEM simulation results reveal that the strength and failure mechanism have a strong dependency on the intermediate principal stress except for the specimen with the inclined angle of 60° and the joint parallel to the intermediate principal stress direction. In addition, the influence of the joint inclined angle on the strength and failure characteristics is significant except for the specimen with the joint parallel to the minimum principal stress direction. Tensile cracks are the dominant failure mechanism. Based on a 3D true triaxial failure criterion, the simulated strength data can be predicted using four empirical parameters.

为了研究岩体的强度和破坏特性，本研究使用 3D 离散元方法 (DEM) 对节理大理岩进行了大量模拟真三轴压缩试验。进行了三个系列的试验，研究了中间主应力和接头倾斜角对宏观力学特性的影响。DEM 模拟结果表明，除了倾斜角为 60°且接头平行于中间主应力方向的试件外，强度和破坏机制对中间主应力有很强的依赖性。此外，除了接头与最小主应力方向平行的试件外，接头倾斜角对强度和破坏特性的影响是显着的。拉伸裂纹是主要的失效机制。基于 3D 真三轴破坏准则，可以使用四个经验参数预测模拟强度数据。