A simulation study of microstructure evolution inside the shear band in biaxial compression test
A simulation study of microstructure evolution inside the shear band in biaxial compression test
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DOI：
10.1002/nag.917
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发表时间：
2011-04
影响因子：
4
通讯作者：
Z. Mahmood;K. Iwashita
中科院分区：
文献类型：
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作者：
Z. Mahmood;K. Iwashita
我们研究了由椭圆形颗粒组成的颗粒介质中剪切带内部微观结构的发展。采用二维离散单元法模拟平面应变双轴压缩试验。剪切带内的大空隙和过度颗粒旋转的浓度的产生被发现在一个非常类似的方式在天然土壤中观察到的。研究了剪切带内外微观组织的演化规律。剪切带内颗粒旋转的大小和方向受椭圆颗粒长轴取向的影响。由于剪切带内的这种颗粒旋转，颗粒的优选排列在残余状态下变成水平的，这导致沿沿着大主应力轴取向的更各向异性的接触正态分布。版权所有© 2010约翰威利父子有限公司.
We study the development of microstructure inside the shear band in granular media consisting of elliptical‐shaped particles. Plane strain biaxial compression test was simulated using two‐dimensional distinct element method. The generation of large voids and concentration of excessive particle rotation inside a shear band are found in a quite similar manner to those observed in natural soils. Evolution of the microstructure inside and outside the shear band is studied. The magnitude and direction of particle rotation inside the shear band is influenced by orientation of long axes of elliptical particles. Because of such particle rotations inside the shear band, the preferred alignment of particles becomes horizontal in the residual state, which results in a more anisotropic contact normal distribution oriented along the major principal stress axis. Copyright © 2010 John Wiley & Sons, Ltd.