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Compaction of granular material inside confined geometries

机译：密闭空间内的粒状材料的压实

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In both nature and the laboratory, loosely packed granular materials are often compacted inside confined geometries. Here, we explore such behaviour in a quasi-two dimensional geometry, where parallel rigid walls provide the confinement. We use the discrete element method to investigate the stress distribution developed within the granular packing as a result of compaction due to the displacement of a rigid piston. We observe that the stress within the packing increases exponentially with the length of accumulated grains, and show an extension to current analytic models which fits the measured stress. The micromechanical behaviour is studied for a range of system parameters, and the limitations of existing analytic models are described. In particular, we show the smallest sized systems which can be treated using existing models. Additionally, the effects of increasing piston rate, and variations of the initial packing fraction, are described.
机译：在自然界和实验室中，松散包装的颗粒状材料通常在密闭的几何形状内压实。在这里，我们在准二维几何中探索这种行为，其中平行的刚性壁提供了约束。我们使用离散元素方法来研究由于刚性活塞的位移而导致的压实导致颗粒填料内部产生的应力分布。我们观察到填充物内部的应力随累积晶粒的长度呈指数增加，并且显示出对当前分析模型的扩展，该模型适合于所测应力。研究了一系列系统参数的微力学行为，并描述了现有分析模型的局限性。特别是，我们展示了可以使用现有模型进行处理的最小尺寸的系统。另外，描述了增加活塞速率和初始填充率变化的影响。

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