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中文摘要：
颗粒DEM数值模拟中,首先需要进行数值颗粒集合体的组装,颗粒形状与孔隙率是重要的组装参数。采用PFC2D对不同形状颗粒的摩擦系数与孔隙率之间的对应关系进行了探讨,形成了一种获取指定孔隙率数值颗粒集合体的方法。鉴于圆形颗粒集合体表观强度较低的情况,对3种非圆形颗粒的强度和剪胀性曲线进行了对比。将80%的条形颗粒与20%的三角形颗粒混合,获得了指定相对密度85%的集合体,并标定得到了颗粒细观参数。不改变颗粒混合体形状与比例,组装得到相对密度为50%的试样,对颗粒接触力学参数进行微调后也可以获得与实际试验曲线较为对应的结果。采用组装与标定结果,模拟砂填料桩承式路堤模型试验,获得的路堤填料变形演化过程与模型试验吻合,验证了颗粒组装与标定方法的可靠性。
英文摘要：
In the DEM simulations,appropriate numerical particle assembly should be obtained before doing the calibrations or simulations.The shape of the particles and the porosity of the sand are key parameters to the numerical assembly.PFC2 D was used to discuss the relationships between the friction coefficient assigned during the assembly and the porosity obtained.An applicable method for abstaining a numerical assembly with assigned porosity were built based on the above works.Due to the low apparent strength of the circle particle assembly,the strengths of 3types of non-circle particles were calculated.By comparison,80% of long strip shape particles and 20% of triangular shape particles were mixed and the micromechanical parameters under relative density of 85% were obtained.Keeping the percentage of different shapes of the mixed particles while changing the relative density of 50%,the test results can be matched well by slightly adjusting the micromechanical parameters.The mixed assembly under the relative density of 85% and the micromechanical parameters were used in simulating the piled embankment model tests.The simulation results of the deformation of the sand fill coincided well with the model tests.The particle assembly method was verified according to the simulations.
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