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南京云母砂主要由片状颗粒组成,具有较为明显的各向异性特性。采用香港科技大学的自动控制空心圆柱扭剪仪进行了应力主轴方向角分别为10°、30°、60°、80°的密实云母砂定轴剪切试验,研究云母砂的初始各向异性规律。为研究中主应力的影响,又对同一密度的试样在中主应力系数b=0.1、0.5、1.0三种不同情况下进行定轴剪切试验。试验结果表明,在大主应力方向角从0°～90°的变化过程中,强度先减小后增大,且随着b值的增加强度增大;变形表现出明显的各向异性,随着b值的增加体变增大。
Nanjing Mica sand mainly composed of flaky particles, with more obvious anisotropic properties. The self-controlled hollow cylindrical torsional shear instrument of Hong Kong University of Science and Technology was used to carry out the test of the dense mica sand on the fixed axis of the mandrel with 10, 30, 60 and 80 degrees of orientation, and the initial anisotropy of mica sand . For the study of the impact of the main stress, but also for the same density of the sample in the main stress coefficient b = 0.1,0.5,1.0 under three different cases of axial shear test. The experimental results show that the strength first decreases and then increases with the increase of b value when the direction angle of principal stress changes from 0 ° to 90 °, and the deformation shows obvious anisotropy The increase of b value increases.