Accurate estimation of the triaxial compression behavior of jointed coal is essential for coal mining. Few studies addressed the triaxial compression behavior of large-scale rock mass, especially with real joint geometry. We employed a numerical synthetic rock mass (SRM) method to study the triaxial compression behavior of jointed coal. Jointed-coal specimens were constructed based on in-situ joint measurements and microparameter calibration against laboratory experiments. A series of triaxial compression tests under different loading orientations and confining pressures were numerically performed to obtain joint and confining-pressure effects on the triaxial compression behavior and reveal the failure mechanism of jointed coal. Results suggest that the triaxial compression behavior of the jointed coal has strong joint and confining-pressure effects. Joints weaken the strength and elastic modulus, reduce the lateral deformation, and affect the geometries of the shear-rupture surface. An increase in the confining pressure causes the peak and residual strength increase significantly. With an increase in the confining pressure, the elastic modulus increases sharply at low confining pressure, the mechanical behavior transitions from brittleness to ductility, the failure mode transitions from shear-rupture surface to plastic flow, and the joint effect diminishes and even disappears. The jointed coal fails by means of a shear-rupture surface under triaxial compression loading with a confining pressure (which is not too high), and the geometries of the shear-rupture surface vary with the distribution of joints.

准确估计节理煤的三轴压缩行为对于煤矿开采至关重要。很少有研究涉及大型岩体的三轴压缩行为，尤其是在实际节理几何形状的情况下。我们采用数值合成岩体 (SRM) 方法来研究节理煤的三轴压缩行为。基于原位联合测量和针对实验室实验的微参数校准构建了联合煤样本。对不同加载方向和围压下的一系列三轴压缩试验进行了数值模拟，以获得节理和围压对三轴压缩行为的影响，揭示节理煤的破坏机理。结果表明，节理煤的三轴压缩行为具有较强的节理和围压效应。接头会削弱强度和弹性模量，减少横向变形，并影响剪切断裂面的几何形状。围压的增加导致峰值和残余强度显着增加。随着围压的增加，低围压下弹性模量急剧增加，力学行为由脆性转变为延性，破坏模式由剪切-断裂面转变为塑性流动，接头效应减弱甚至消失。在围压（不太高）的三轴压缩载荷下，节理煤通过剪切破裂面破坏，