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研究千枚岩各向异性特征,在MTS 815岩石伺服试验机上对天然含水状态下的千枚岩进行常规三轴压缩试验,分析了岩石破坏的全过程,讨论了岩石片理面与主加载方向夹角以及试验围压对其破坏模式的影响。试验结果表明:千枚岩夹角在0°~50°范围内的破坏模式有3种,即张拉-剪切复合型破坏,横交片理结构面剪切和沿片理结构面滑动的复合型破坏,沿片理结构面间的剪切滑动破坏。随着夹角的增大,强度逐渐降低,其破坏模式发生了由复合型向单一型的转变。千枚岩的变形参数和强度参数有明显的各向异性特征,弹性模量和黏聚力对夹角的响应比较明显。引入各向异性度概念,得到千枚岩的各向异性度随围压增大逐渐降低的结论。试验的研究结果为岩体工程的稳定性分析提供了参考。
The anisotropy of phyllite was studied. The conventional triaxial compression tests were carried out on the MTS 815 rock servo test machine, and the whole process of rock failure was analyzed. The relationship between the rock facet and the main loading direction Angle and test confining pressure on the failure mode. The results show that there are three failure modes of the phyllite in the range of 0 ° ~ 50 °, that is, the tensile-shear composite failure, the shear stress of the transverse structural plane and the sliding along the structural plane Compound damage, along the shear structure between the shear sliding interface damage. As the included angle increases, the strength gradually decreases, and the failure mode changes from complex type to single type. Phyllite deformation parameters and strength parameters have obvious anisotropic characteristics, elastic modulus and cohesion of the response of the angle is obvious. By introducing the concept of anisotropy, we can conclude that the anisotropy of phyllite decreases with the increase of confining pressure. The results of the experiment provide a reference for the stability analysis of rock mass engineering.