This study prepared transversely isotropic rock-like specimens in three groups of layer thickness ratios, alternating with two kinds of rock-like materials. The conventional triaxial compression tests confirm mechanical difference of the two rock-like materials. The velocities of ultrasonic wave (longitudinal wave V_P) are measured for each transversely isotropic rock-like specimen before uniaxial compressive test, the results present an anisotropic behavior with the degree of longitudinal wave velocity anisotropy (V_Pmax/V_Pmin) of the three groups of transversely isotropic rock-like specimens are 1.44, 1.08 and 1.09, respectively. The uniaxial compression test indicates that the strength variation of the three groups of transversely isotropic rock-like specimens are “U-shaped”, with the degree of strength anisotropy (σ_cmax/σ_cmin) are 2.35, 4.42 and 2.08, respectively. An empirical failure criterion introduced by Jaeger and modified by Donath predicts the failure strength of transversely isotropic rock-like specimen well. The acoustic emission result shows that the AE ringing count is significant to the surface crack extending. The failure pattern of transversely isotropic rock-like specimens can be classified into one of the following three modes: (a) tensile-split along the core axes when small bedding angle (0°, 15°, 30°), (b) shear-sliding along the bedding plane when major bedding angle (45°, 60°, 75°) and (c) split along the vertical bedding plane when bedding angle of 90°.

中文翻译：

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横观各向同性岩石状材料单轴压缩强度与破坏行为的试验研究

本研究以三组层厚比制备了横观各向同性的岩石样，并与两种岩石样材料交替使用。常规的三轴压缩试验证实了两种岩石状材料的机械差异。超声波（纵波的速度V _P）为每个横观各向同性测量岩石状单轴压缩试验前的试验片，结果呈现各向异性行为与度纵波速度各向异性的（V _P最大/ V _PMIN三组横观各向同性岩石样的）分别为1.44、1.08和1.09。的单轴压缩试验表明，三组横观各向同性的岩石样试样的强度的变化是“U形”，具有强度各向异性（度σ_{的C max} / σ_的Cmin）分别为2.35、4.42和2.08。Jaeger提出并经Donath修改的经验破坏准则可预测横观各向同性岩石样试样的破坏强度。声发射结果表明，AE振铃次数对表面裂纹扩展具有重要意义。横观各向同性岩石样的破坏模式可分为以下三种模式之一：（a）层理角度小（0°，15°，30°）时沿芯轴的拉伸分裂；（b）剪切-当主倾角（45°，60°，75°）和（c）呈90°倾角时，沿着垂直接缝平面裂开时，沿着接缝平面滑动。