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基于颗粒流理论及其PFC2D程序,在细观层次上从数值分析角度研究了碎石的直剪试验,从而揭示了其抗剪强度和变形机理。研究中针对碎石提出了一种随机计算模型,并给出了随机模型的实现方法,同时对该随机模型的算法可靠性进行了验证。文中探讨了在直接剪切试验中碎石的抗剪强度随位移的变化以及最大粒径、竖向压力对其影响,并从细观力学的角度上描述了直剪试验过程中颗粒的运动机理。直剪试验过程中的碎石细观结构变化的颗粒流仿真,是关于碎石细观力学特征与宏观力学响应相关联的初步研究。
Based on the theory of particle flow and its PFC2D program, the direct shear test of gravel was studied from the perspective of numerical analysis at the mesoscale level, and the shear strength and deformation mechanism were revealed. In this study, we propose a stochastic computing model for gravel, and give a method to implement stochastic models. At the same time, we verify the algorithm’s reliability. In this paper, the shear strength of the gravel in direct shear tests with the change of displacement as well as the influence of the maximum particle diameter and the vertical pressure are discussed. The motion mechanism of the particles during the direct shear test is also described from the perspective of meso-mechanics . Particle flow simulation of the gravel microstructure changes during the direct shear test is a preliminary study on the relationship between micromechanical characteristics of gravel and macroscopic mechanical response.