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为了研究硬岩与软岩交界面方向对其破坏形式的影响,对含岩石-水泥砂浆(代替软岩)交界面的组合试样进行了多组加载角度的巴西劈裂试验,获得了不同交界面方向的组合试样的“抗拉”强度,并利用颗粒流程序PFC2D研究了交界面的破坏机理.计算得到的“抗拉”强度随交界面与加载方向夹角的增大而增大.当交界面平行于加载方向时,沿交界面发生劈裂破坏,计算得到的“抗拉”强度可认为是交界面的抗拉强度;当交界面与加载方向不平行时,发生更为复杂的拉―剪复合破坏.此外,为了进一步分析交界面的抗拉强度对破坏形式的影响,采用提高水泥用量和增大交界面粗糙度两种方法增加交界面的抗拉强度,并进行了一系列试验.试验得到了含交界面的巴西劈裂试验的典型破坏模式分布图,对更好地理解硬岩与软岩交界面的破坏形式具有指导意义.
In order to study the influence of the interfacial direction of hard rock and soft rock on their failure modes, Brazilian split tests with multiple loading angles were carried out on the composite specimens containing the interface of rock-cement mortar (instead of soft rock) Tensile strength of the composite specimens in the interface direction and the failure mechanism of the interface were studied by the particle flow program PFC2D.The calculated tensile strength increases with the increase of the angle between the interface and the loading direction And increases.When the interface is parallel to the loading direction, splitting failure occurs along the interface, and the calculated tensile strength can be considered as the tensile strength of the interface.When the interface is not parallel to the loading direction , In order to further analyze the impact of the interface tensile strength on the form of failure, increase the amount of cement and increase the interface roughness of two ways to increase the tensile strength of the interface , And a series of experiments were carried out.The distribution of typical failure modes of Brazilian splitting test with interface was obtained, which is instructive for the better understanding of the failure modes of interface between hard and soft rocks.