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应用离散单元法研究了颗粒土试样在传统三轴压缩、平面应变和直剪3种不同荷载条件及不同初始条件下的变形破坏特性,从微观角度分析了不同条件下颗粒土试样变形的根本物理机理.对不同初始孔隙比、不同围压、不同荷载条件下的试样变形和破坏进行了数值模拟计算分析.结果表明,离散单元法可以准确反映试样的变形情况和局部应变等特性.通过对微观颗粒行为包括颗粒旋转和颗粒平移及局部孔隙率的研究,从细微观角度解释了不同条件下试样的变形特性和局部应变的产生机理,结果显示,荷载条件是影响试样变形破坏模式的重要因素,土的微观行为特性是其宏观表现特性的根本的内在物理原因.
The discrete element method was used to study the deformation and failure characteristics of granular soil specimens under three different loading conditions, such as conventional triaxial compression, plane strain and direct shear, and under different initial conditions. From the microscopic point of view, the deformation of granular soil specimens under different conditions The basic physical mechanism of the sample is calculated by numerical simulation of the deformation and failure of specimens with different initial void ratio, confining pressure and different loading conditions. The results show that the discrete element method can accurately reflect the deformation and local strain of the specimen Through the study of microscopic particle behavior including particle rotation and particle translation and local porosity, the deformation characteristics and local strain mechanism of the sample under different conditions are explained from the microscopic point of view. The results show that the loading conditions affect the deformation of the sample The destruction of the mode of an important factor in the micro-behavior of soil is its macro performance characteristics of the fundamental internal physical reasons.