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Effects of particle morphology on the shear response of granular soils by discrete element method and 3D printing technology
International Journal for Numerical and Analytical Methods in Geomechanics ( IF 4 ) Pub Date : 2022-05-25 , DOI: 10.1002/nag.3384
Xiongying Ma 1, 2, 3 , Hang Lei 1, 2, 3 , Xin Kang 1, 2, 3
Affiliation  

The development of quantitative correlation between particle morphology and shear responses of granular soils is an ongoing challenge. Herein, 3D printing technology, combined with the experiments and discrete element simulations were conducted to study the effects of different particle shapes on the particle migration, the development of shear zone, and the anisotropy of particle contact during shearing. Both numerical simulations and experimental tests confirmed that the increase of modified shape parameter Sh strengthens the interlock between particles, which in turn limits the shear deformation in the direction of shearing. As the shear load increases further, the rotation of particles begins to develop from both sides of the shear box boundary, which gradually expands to the center, and finally forms a stable disturbance region in the center of the specimen; meanwhile, the positions of the maximum particle rotation appear at the center and boundary of the shear zone. Moreover, particle shape does not affect the distribution of fabric anisotropy before loading, however, the change of particle shape parameter Sh makes the fabric anisotropy become prominent. In addition, particle shape is found to improve the shear resistance by changing the number and distribution of contacts between particles, rather than the contact force among particles.

中文翻译:

离散元法和3D打印技术研究颗粒形态对颗粒土剪切响应的影响

颗粒形态和颗粒土壤剪切响应之间的定量相关性的发展是一个持续的挑战。在此,采用3D打印技术,结合实验和离散元模拟,研究了不同颗粒形状对颗粒迁移、剪切带发展以及剪切过程中颗粒接触各向异性的影响。数值模拟和实验测试都证实了修正形状参数S h的增加加强了颗粒之间的联锁,从而限制了剪切方向的剪切变形。随着剪切载荷的进一步增大,颗粒的旋转从剪切盒边界两侧开始发展,逐渐向中心扩展,最终在试件中心形成稳定扰动区;同时,最大粒子旋转的位置出现在剪切带的中心和边界处。此外,颗粒形状不影响加载前织物各向异性的分布,但颗粒形状参数S h的变化使织物的各向异性变得突出。此外,发现颗粒形状通过改变颗粒之间接触的数量和分布而不是颗粒之间的接触力来提高剪切阻力。
更新日期:2022-05-25
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