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片岩因受片理面影响,其变形行为和破坏机制与一般岩体存在明显差异。为此,采用室内单轴压缩试验,研究了十堰-房县高速通省隧道武当群片岩在片理面倾角分别为0°、45°、90°时的变形参数各向异性特征及破坏机制。结果表明:片岩变形参数及破坏模式具有显著的各向异性特征。按照弹性模量E由大到小的顺序,试样的片理面倾角依次为:90°、0°、45°;按照泊松比v由大到小的顺序,试样的片理面倾角依次为:45°、0°、90°。片理面倾角为0°时试样以垂直片理面方向的压断破坏为主,45°时试样以沿片理面方向的纯剪切破坏为主,90°时以劈裂破坏为主。在此基础上,通过电镜扫描、FLAC3D数值试验结果等,分析了片岩变形破坏各向异性的机制,认为主要原因是片理面空间方位与轴向力方向不同的组合,导致软弱结构面——片理面对片岩变形的贡献差异明显。
Due to the influence of the cleavage plane, the deformation behavior and failure mechanism of schist are obviously different from the general rock mass. For this reason, the indoor uniaxial compression test was used to study the anisotropy of deformation parameters and the failure mechanism of Wudang group schist in the Shiyan-Fangxian high-speed tunnel at the slab angles of 0 °, 45 ° and 90 °, respectively. The results show that the deformation parameters and failure modes of schist have significant anisotropy characteristics. According to the order of the elastic modulus E from big to small, the sample face rake angle is: 90 °, 0 °, 45 °; according to the Poisson’s ratio v descending order, the sample rake angle Followed by: 45 °, 0 °, 90 °. The specimens were mainly fractured and fractured in the direction perpendicular to the plane of facet at 0 ° facet angle. The pure shear failure at 45 ° was mainly along the plane of facet, and the fracturing at 90 ° the Lord. On this basis, the mechanism of deformation and failure anisotropy of schist was analyzed by scanning electron microscopy (SEM), numerical results of FLAC3D and so on. The main reason is that the combination of space azimuth and axial force direction of the facets leads to the weak structural plane- The difference in the contribution to the deformation of schist is obvious.