In rock engineering, the failure mechanism of a fractured rock mass under compression-shear stress has been focused on, but the effect of filler in fracture-filled rock masses has not received widespread attention. In this research, compression-shear tests are performed on rock-like specimens with three fissures under four filling conditions, unfilled, gypsum filled, cement filled and resin filled, to obtain the effect of three fillers on the mechanical characteristics and failure mode of fractured specimens. The discrete element method (DEM) is used to analyse the crack propagation and coalescence of the specimens. The results show that the peak load and displacement of specimens primarily depend on the strength of the fillers and inclination angle of the central fissure. For gypsum and cement filled specimens, when the fissure inclination angle is small, the influence of fillers on the peak load and displacement is obvious, but the effect can be neglected when the fissure inclination angle is large. The resin has a remarkable influence on the peak load and displacement of all specimens. Three failure modes were found in this study. Failure mode I primarily occurs when the fissure inclination angle is 0°. Failure mode II appears in specimens with a fissure inclination angle equal to 30° or 45°. The failure mode of specimens with a fissure inclination angle equal to 60°, 75° or 90° is defined as mode III. For the failure mode, the action mechanism of filler is to weaken stress borne by rock-like material. The larger the weakening degree of the shear stress is, the easier tensile failure occurs in filled specimens. However, when the stress is substantially weakened, the failure mode of filled specimens is similar to that of specimens containing no fissures.

在岩石工程中，压裂应力作用下的裂隙岩体的破坏机理已得到关注，但在裂隙充填岩体中填料的作用尚未引起广泛关注。在这项研究中，在没有填充，石膏填充，水泥填充和树脂填充的四种填充条件下，对具有三个裂缝的岩石样试样进行压缩剪切试验，以获得三种填充剂对断裂的力学特性和破坏模式的影响。标本。离散元法（DEM）用于分析试样的裂纹扩展和合并。结果表明，试样的峰值载荷和位移主要取决于填料的强度和中心裂缝的倾角。对于石膏和水泥填充的标本，当裂缝倾角较小时，填料对峰值载荷和位移的影响是明显的，但是当裂缝倾角较大时，填料的影响可忽略不计。树脂对所有样品的峰值载荷和位移都有显着影响。在这项研究中发现了三种故障模式。失效模式I主要发生在裂缝倾斜角为0°时。破坏模式II出现在裂缝倾角等于30°或45°的样本中。裂缝倾斜角等于60°，75°或90°的试样的破坏模式定义为模式III。对于破坏模式，填料的作用机理是减弱岩石材料所承受的应力。剪应力的弱化程度越大，填充样品中的拉伸破坏越容易发生。然而，