Investigation of the Critical State in Soil Mechanics Using DEM
Investigation of the Critical State in Soil Mechanics Using DEM
复制标题
利用 DEM 研究土壤力学的临界状态
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Hans Jürgen Herrmann
中科院分区：
文献类型：
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作者：
A. A. Peña;R. García;F. Alonso;Hans Jürgen Herrmann
土力学中所谓临界状态的存在性和唯一性在不规则多边形颗粒的DEM模拟中得到了验证。对于不同的颗粒形状特征，临界状态与初始应力和密度条件无关。我们保持低压力水平，因为我们没有考虑颗粒的破碎。在双轴试验模拟各向同性颗粒演变的极限状态，在该系统达到临界孔隙比和变形与恒定的体积，偏应力，织物各向异性，和机械配位数。最后一个被发现是第一个达到临界值的变量，使得其余的微观和宏观力学变量可以收敛到临界状态。在周期性剪切单元试验中，对于具有各向异性颗粒的大剪切变形样品，剪切力和孔隙比在宏观力学水平上达到相同的临界值。在微机械水平上，复合材料...
The existence and uniqueness of the so‐called critical state in soil mechanics is validated in our DEM simulations of irregular polygonal particles. For different particle shape characteristics, the critical state is independent of the initial stress and density conditions. We retain low stress levels, since we do not take into account the crushing of particles. In biaxial test simulations isotropic particles evolve toward a limiting state in which the system reaches a critical void ratio and deforms with constant volume, deviatoric stress, fabric anisotropy, and mechanical coordination number. The last one has been found to be the first variable to attain a critical value making possible for the rest of micro‐and‐macro‐mechanical variables the convergence to the critical state. In periodic shear cell tests, for large shear deformations samples with anisotropic particles reach at the macro‐mechanical level the same critical value for both shear force and void ratio. At the micro‐mechanical level the compo...