Experimental Investigation on the Mechanical Characteristics and Deformation Behaviour of Fractured Rock‐Like Material with One Single Fissure under the Conventional Triaxial Compression

An experimental study was carried out on a rock‐like material specimen containing a single fissure to investigate its mechanical characteristics and deformation behaviour under triaxial compression. The mechanical characteristics, such as peak strength and residual strength, are discussed. The confining pressure had a distinct effect on the ductility characteristics of the specimen. “A distinct stress drop” occurred in the early stage of the stress‐strain curve when the length fissure was relatively long. The I‐crack, II‐crack, and III‐crack are all observed under triaxial compression, and the III‐crack is commonly observed under triaxial compression. Confining pressure plays an essential role in affecting the failure mode of the specimen. There are three kinds of failure modes in the triaxial compression experiment on a rock‐like material specimen with one single fissure: tensile‐shear comprehensive failure, “X”‐shaped shear failure, and shear failure along the fissure plane. These results are important and fundamental to understand the fracture mechanism of rock engineering.