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采用颗粒流PFC数值模拟方法,生成符合标准砂室内单元试验结果的离散元数值试验试样。运用重力沉积法建立不规则砂土颗粒单元的平面双轴试验模型,给定不同沉积步数对试样不同初始原生状态进行模拟,然后分别从水平和竖直方向上施加荷载增量,得到不同沉积条件下不同加载方向上砂土试样宏观应力应变曲线和力学参数。数值试验结果显示,重力沉积步数对颗粒微观长轴定向排列、平均配位数有显著影响;初步建立了砂土微观结构变化和宏观应力应变曲线及力学参数的联系;分析了砂土试样表现出的宏观原生各向异性力学特性与内部颗粒结构的关系。
Particle flow PFC numerical simulation method is used to generate discrete element numerical test specimens that meet the test results of standard sand indoor units. The plane biaxial test model of irregular sand granular units was established by gravity sedimentation method. Different initial deposition steps were used to simulate the initial initial state of the specimens, and then the loading increments were applied from the horizontal and vertical directions respectively to get different Macroscopic stress - strain curves and mechanical parameters of sand samples in different loading directions under deposition conditions. The results of numerical experiments show that the number of gravitational deposition steps has a significant effect on the directional alignment and the average coordination number of the microscopic long axis of the particles. The microscopic structural changes of the sand and the macro-stress-strain curves and the mechanical parameters are initially established. Showing the relationship between macroscopic primary anisotropic mechanical properties and internal particle structure.