Complex jointed rock masses are common in nature. When a roadway is located in complex jointed rock mass, numerous joints can weaken the strength of surrounding rock, resulting in large deformation of the roadway and impact on mine production. In this paper, a DFN–DEM jointed roadway model was constructed based on discrete element method, with the failure characteristics and layout optimization of roadway analyzed. Also, the mechanical properties of jointed rock masses with different sizes and rotation angles were numerically investigated. And the failure and deformation characteristics of jointed roadway with different layout angles were analyzed. The results demonstrated that the UCS of jointed rock masses under different loading directions are significantly different, with an RVE size of 6 m. UCS of the jointed rock masses reaches maximum value at the rotation angles of 30° and −60°, and the average UCS of rock masses has a positively relationship with the joint density P₃₀. The shear instability of joints results in the macro-failure of rock masses, and brings about the asymmetric failure of jointed roadway. The layout angle of jointed roadway can significantly affect its failure and deformation characteristics. With the roadway axial direction adjusted to −60° relative to the direction of principal stress, the deformation degree of the surrounding rock reached minimum values. In engineering practice, an optimal layout angle and supporting of jointed roadway are effective for avoiding the large deformation of surrounding rock.

复杂节理岩体在自然界中很常见。当巷道位于复杂节理岩体中时，节理众多，会削弱围岩强度，导致巷道变形较大，影响矿山生产。本文基于离散元法构建DFN-DEM联合巷道模型，分析巷道破坏特征及布置优化。此外，还对不同尺寸和旋转角度的节理岩体的力学特性进行了数值研究。并对不同布置角度的节理巷道破坏变形特征进行了分析。结果表明，节理岩体在不同加载方向下的UCS存在显着差异，RVE尺寸为6 m。节理岩体的UCS在旋转角度30°和-60°时达到最大值，且岩体的平均UCS与节理密度P ₃₀呈正相关关系。节理剪切失稳导致岩体宏观破坏，带来节理巷道的非对称破坏。节理巷道布置角度对其破坏变形特性有显着影响。当巷道轴向相对主应力方向调整至-60°时，围岩变形程度达到最小值。在工程实践中，节理巷道的优化布置角度和支护是避免围岩大变形的有效方法。