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为研究裂隙类岩石材料在单轴压缩条件下的力学性质及裂纹扩展规律,通过在试样中预埋铁片的方法,制备出含不同裂纹条数和裂纹倾角的裂隙类岩石材料;采用RYL-600剪切流变仪对试样进行以负荷控制方式进行单轴加载,并使用数码相机记录试样加载过程中裂纹的起裂、扩展和贯通过程.着重对60°×18条裂隙类岩石材料的实验结果进行详细分析,观察其轴向应力-轴向位移曲线,曲线呈现出3次明显的应力跌落阶段,结合试样在试验过程中的录像,将裂纹的扩展分为3个阶段.并且,通过FLAC3D数值模拟软件对60°×18条的试样进行数值模拟研究,获得了数值模拟实验加载过程中的轴向应力-轴向位移曲线和模型破坏切片图,分析其破坏方式和破坏模式,并与物理实验对比,两者吻合较好.
In order to study the mechanical properties of cracked rock material under uniaxial compression and the crack growth law, fractured rock materials with different crack number and crack dip angle were prepared by embedding iron flake in the sample. RYL -600 shear rheometer was used to uniaxially load the specimen under load control mode and use the digital camera to record the crack initiation, propagation and penetration during the specimen loading process. The experimental results of the material were analyzed in detail, and the axial stress-axial displacement curve was observed. The curve showed three significant stress drop stages. The crack propagation was divided into three stages according to the video recorded during the test. In addition, the numerical simulation of 60 ° × 18 specimens by FLAC3D numerical simulation software was carried out. The axial stress-axial displacement curve and the model failure slice in the process of numerical simulation were obtained, and the failure modes and damage Mode, and compared with the physical experiment, both agree well.