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各向异性颗粒材料的变形与主应力作用方向相关。为采用离散元方法分析各向异性颗粒材料的细观变形过程,首先用2个系列的物理试验验证离散元数值模拟的可靠性和有效性。所采用的物理试验为对理想椭圆形金属棒状材料进行的不同侧向压力和不同大主应力作用方向的双轴压缩试验。在此基础上,利用离散元数值模拟可获得任意加载时刻颗粒的空间分布、运动和接触特征的优点,通过综合分析多个变形阶段颗粒的位移轨迹和旋转探讨不同大主应力方向加载时剪切带的演化过程。并进而对比剪切带内外颗粒长轴定向和孔隙的不同变化特征,发现随着变形的发展,剪切带内颗粒长轴定向趋于某一固定角度,剪切带内的孔隙比亦趋于某一定值。
The deformation of the anisotropic granular material is related to the direction of the principal stress. In order to analyze the mesoscopic deformation process of anisotropic granular materials by discrete element method, the reliability and validity of discrete element numerical simulation are validated by two series of physical experiments. The physical test used is a biaxial compression test of the ideal elliptical metal rod material with different lateral pressures and different principal principal stress directions. On this basis, the discrete element numerical simulation can be used to obtain the advantage of the spatial distribution, motion and contact characteristics of particles at any loading time. By analyzing the displacement trajectories and rotation of particles at different deformation stages, Belt evolution. And then compared with the long axis orientation of the inner and outer particles in the shear band and the different variation of the pore, it was found that with the development of the deformation, the long axis orientation of the particles in the shear band tends to a certain fixed angle and the void ratio in the shear band tends to A certain value.