Abstract Discontinuities occur in abundance within a rock mass with or without infill material. The infilled discontinuities as weakness planes containing various materials can play an important role in failure mechanism of rock under triaxial stresses that has not yet been investigated. Three types of infilled discontinuities with friction angles of 32.10, 34.34 and 36.34 degrees were created using three types of infill materials (F1, F2 and F3) having different combinations of sand, clay, plaster and water with different uniaxial compressive strength (UCS) of 3.92, 0.62 and 2.20 MPa respectively. Fifteen groups of cylindrical specimens having three different types of infilled discontinuities and five types of discontinuity orientation angles (0, 30, 45 60 and 90 degrees) were tested under confining pressures of 0, 5, 14 and 20 MPa and altogether 180 triaxial tests were carried out. Failure took place at the direction of infilled discontinuities for orientation angles of 30, 45 and 60 degrees for all types of infill materials. As, for stronger infill material (F1) having σci of 3.92 MPa, shear failure occurred at the interface between infill material and the adjacent rock, and for weaker infill materials, failure occurred at the infill materials (F2 and F3). But failure occurred at the body of rock specimens for all infilled discontinuities having orientation angles of 0 and 90 degrees. The higher friction angle and triaxial strength factor were obtained for higher in the sand percentage in the relatively lower strength infill material. The results show that the combinations of infill materials and orientation angle greatly affect the parameters of jointed rock failure criteria. New relationships between parameters of failure criteria with type of infill material and orientation angle of infilled discontinuities were obtained.

中文翻译：

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不连续面填充材料对三轴压应力下岩石破坏准则的影响

摘要 在有或没有填充材料的岩体中，不连续性大量出现。作为包含各种材料的薄弱面的填充不连续性在尚未研究的三轴应力下岩石的破坏机制中可以发挥重要作用。三种类型的摩擦角分别为 32.10、34.34 和 36.34 度的填充不连续性是使用三种类型的填充材料（F1、F2 和 F3）创建的，这些材料具有不同的砂、粘土、石膏和水组合，具有不同的单轴抗压强度 (UCS)分别为 3.92、0.62 和 2.20 兆帕。在 0、5、5 和 5 的围压下测试了 15 组具有三种不同类型的填充不连续性和五种类型的不连续性取向角（0、30、45、60 和 90 度）的圆柱形试样 进行了 14 和 20 MPa 以及总共 180 次三轴试验。对于所有类型的填充材料，在 30、45 和 60 度的取向角的填充不连续方向上都发生了故障。对于 σci 为 3.92 MPa 的强填充材料（F1），在填充材料和相邻岩石之间的界面发生剪切破坏，而对于较弱的填充材料，在填充材料（F2 和 F3）处发生剪切破坏。但是，对于取向角为 0 度和 90 度的所有填充不连续性，在岩石试样的主体处发生破坏。较高的摩擦角和三轴强度系数是在相对较低强度的填充材料中砂百分比较高而获得的。结果表明，填充材料与方位角的组合对节理岩体破坏准则参数影响较大。获得了失效准则参数与填充材料类型和填充不连续性方向角之间的新关系。