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试样颗粒初始架构是粗粒土室内三轴试验中一个难以人为控制的因素。基于元胞自动机方法,结合粗粒土的室内三轴试验开发了能制备不同颗粒初始架构粗粒土试样的HHC-CA模型,该模型制备的粗粒土试样表征了粗粒土各粒组分布的不均匀性和随机性,再借助FLAC3D进行粗粒土三轴数值模拟试验,并探讨了试样剪切带内的砾石含量和试样砾石含量对内摩擦角的影响。数值模拟结果表明,同一粒径级配下,粗粒土的内摩擦角值与剪切带内的砾石含量呈增函数关系;试样砾石含量的增加可能会出现内摩擦角减小的现象,但同一粒径级配下的内摩擦角均值随试样砾石含量的增加而明显增大。
The initial structure of the sample particles is a hard-to-art factor in the triaxial test of coarse-grained soil. Based on the Cellular Automata method and the indoor three-axis test of coarse grained soil, a HHC-CA model was developed for preparing coarse grained soil samples with different particle structures. The coarse grained soil samples were characterized by Then, the three-axis numerical simulation of coarse grained soil was conducted with FLAC3D. The effects of gravel content and gravel content on internal friction angle were also discussed. The numerical simulation results show that the internal friction angle of coarse grained soil increases with the gravel content in the shear band under the same particle size distribution. The increase of gravel content may result in the decrease of internal friction angle, However, the average value of internal friction angle with the same particle size gradation increases obviously with the increase of gravel content.