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基于数字图像测量技术改进GDS多功能静三轴仪,研究不同应力路径条件下,中级砂的破坏过程和剪切带形式。进行了等压固结和偏压固结共13个排水压缩应力路径试验,得到三轴试样压缩过程不同时刻的试样变形状态、径向应变和轴向应变场,可表征试样渐进破坏过程。结果表明,不同应力路径条件下的试样破坏过程和形式与应力路径密切相关;同一路径,通过增加孔压和减小总应力两种不同方式实现,其结果也有差异。最终破坏形式可分为均匀鼓胀、单一剪切带和交叉剪切带3种形式。固结的应力比越高,有效应力比峰值越低,并且峰值后有效应力比的值下降越大。试样破坏形式在有效应力比峰值之前已经初步确定,宏观稳定是在峰值之后。
Based on the digital image measurement technology to improve the GDS multi-function static triaxial apparatus, the failure process and shear band form of intermediate sand under different stress paths were studied. A total of 13 drainage compression stress paths were tested by isostatic consolidation and bias consolidation. The deformation state, radial strain and axial strain field at different times of triaxial compression test were obtained, and the specimen progressive failure process. The results show that the failure process and the form of the specimen under different stress paths are closely related to the stress path. The same path is achieved by two different ways: increasing the pore pressure and reducing the total stress, and the results are also different. The final form of damage can be divided into uniform bulging, a single shear zone and cross shear zone in three forms. The higher the consolidated stress ratio, the lower the effective stress ratio peak and the greater the decrease in the effective stress ratio after the peak value. The form of sample damage has been initially determined before the effective stress ratio peak, and the macroscopic stability is after the peak value.