The macroscopic mechanical behavior of granular materials is closely related to the fabric anisotropy and contact force anisotropy. In order to investigate the microevolution of fabric and force anisotropy of rock masses containing non-coplanar intermittent joints under direct shear loading, this paper establishes a numerical model using the particle flow code (PFC) based on the distinct element method (DEM) and investigates the effects of non-coplanar intermittent joints on the evolutions in the fabric and force anisotropy and the distributions of contact forces of rock specimens by setting up specimens with different ligament angles of joints. Meanwhile, the shear strength, deformation characteristics and failure mode, energy dissipation were analyzed to deepen the understanding of the macroscopic mechanical behavior of the specimens from the microscopic mechanism. Three anisotropic tensors \({a}_{ij}^{c}\), \({a}_{ij}^{n}\) and \({a}_{ij}^{t}\) are defined to characterize the anisotropic behavior of the granular materials which can show the evolution law of fabric and mechanical anisotropy of the system under direct shear load. The findings indicate that the degree of fabric anisotropy increases with increasing ligament, and the length of the load side significantly influences the initial mechanical anisotropy of the specimen. Concurrently, a rise in the ligament angle impedes the progression of anisotropy within the specimen, leading to a substantial reduction in the macroscopic mechanical strength of the rock.

颗粒材料的宏观力学行为与织物各向异性和接触力各向异性密切相关。为研究直剪荷载作用下含非共面断续节理岩体的组构微观演化及受力各向异性，采用基于离散元法（DEM）的粒子流程序（PFC）建立数值模型，并进行研究通过设置不同节理韧带角度的试件，研究非共面间断节理对岩石试件结构和力各向异性演化及接触力分布的影响。同时，对试件的剪切强度、变形特征及破坏模式、能量耗散进行分析，从微观机理加深对试件宏观力学行为的理解。三个各向异性张量\({a}_{ij}^{c}\)、\({a}_{ij}^{n}\)和\({a}_{ij}^{t}\)定义用于表征颗粒材料的各向异性行为，可以显示直剪载荷下织物和系统力学各向异性的演化规律。研究结果表明，织物各向异性程度随着韧带的增加而增加，并且载荷侧的长度显着影响试样的初始力学各向异性。同时，韧带角度的增加阻碍了样本内各向异性的进展，导致岩石的宏观机械强度大幅降低。