DEM investigation of particle size distribution effect on direct shear behaviour of granular agglomerates
DEM investigation of particle size distribution effect on direct shear behaviour of granular agglomerates
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DOI：
10.1063/1.3179946
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
Y. Cheng;N. Minh
中科院分区：
文献类型：
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作者：
Y. Cheng;N. Minh
最近，有人提出，一个仔细控制的粒度分布可能会潜在地改变土壤的行为，从公认的临界状态框架，在均匀尺寸的纯砂和纯粘土中观察到[1]。作为该项目的初始部分，对直剪箱进行了一系列的二维离散单元法(DEM)模拟。剪切箱内的颗粒状材料由团聚体表示，每个团聚体是由三个颗粒强结合在一起形成的，没有初始重叠，但具有相同的接触特性。在相同的固体面积和初始孔隙率的情况下，模拟了不同的粒度分布。利用DEM计算技术，对力学行为进行了比较，找出了力学行为变化的细观推理。模拟结果表明..。
Recently, it was proposed that a carefully controlled particle size distribution could potentially change the soil behaviour from well‐accepted Critical State framework that was observed in both pure sand and pure clay of uniform sizes to the “transitional” behaviour [1]. As the initial part of the project to identify the reasons contributing the transitional behaviour, a series of 2D Distinct Element Method (DEM) simulations of direct shear box was carried out. The granular material inside the shear box is represented by agglomerates; each of them is formed by strongly bonding three particles together without initial overlapping, but possesses the same contact properties. Different particle size distributions were simulated with the same amount of solid area and initial void ratio. The mechanical shearing behaviour was compared, and the micromechanical reasoning governing the changes of the mechanical behaviour was identified with the help of the computational technique of DEM. The simulated results show...