Abstract

The discrete element modelling (DEM) based on replacement method has been widely conducted to study the macroscopic behaviour of soil with particle breakage. The experimental results of the contact behaviour of a brittle particle under multiple contacts are necessary to justify the current breakage criteria and contact models. A novel apparatus was developed to conduct rock sphere compression tests under multiple contacts. The influence of size, lateral contact force and coordination number on contact behaviour and particle breakage was revealed. The experimental results show that significant plastic deformation occurred at the contact area and both shear and tensile failure patterns were observed. The failure strength of the marble sphere linearly decreases with the increasing marble sphere diameter. The lateral contact force and coordination number have almost no influence on the failure contact force and vertical contact force vs. displacement curves before failure, which justified the breakage criterion of maximum contact force. However, the failure patterns of marble spheres were significantly influenced by the lateral contact force and coordination number.

Graphical Abstract

中文翻译：

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多次接触和大小对大理石球接触行为影响的实验研究

摘要

基于替换方法的离散元建模（DEM）已被广泛地用于研究具有颗粒破碎作用的土壤的宏观行为。脆性颗粒在多个接触下的接触行为的实验结果对于证明当前的破坏标准和接触模型是必要的。开发了一种新颖的装置来在多个接触下进行岩石球体压缩测试。揭示了尺寸，横向接触力和配位数对接触行为和颗粒破碎的影响。实验结果表明，在接触区域发生了显着的塑性变形，并且观察到剪切和拉伸破坏模式。大理石球的破坏强度随着大理石球直径的增加而线性减小。横向接触力和配位数几乎对破坏前的破坏接触力和垂直接触力与位移曲线没有影响，这证明了最大接触力的破坏准则。但是，大理石球的破坏方式受侧向接触力和配位数的影响很大。

图形概要