Packing potential index for binary mixtures of granular soil
Packing potential index for binary mixtures of granular soil
复制标题
颗粒土二元混合物的堆积潜力指数
DOI：
10.1016/j.powtec.2020.06.005
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
Deng, Yibing
中科院分区：
文献类型：
--
作者：
Chang, Ching S.;Deng, Yibing
填料过程是土颗粒形成填料的机械过程，如漏斗灌注、压实、抽杆、填塞、压实、振动、压缩等。对于砂-粉土混合物，填料过程和颗粒形状对二元混合物的密度有重要影响。然而，这两个因素都没有考虑在大多数现有的颗粒堆积密度模型。因此，现有的颗粒堆积密度模型不适用于砂粉土混合物。本文研究了填充过程和颗粒形状对二元混合物密度的影响。本文首先定义了一个填充势指数，它是一个衡量二元混合物体系在填充过程中由于两组分混合而导致的体积减小潜力的指标。为了理解堆积势指数的本质，我们比较了从文献中收集的24种不同类型混合物的堆积势指数;这24种类型的混合物是由两种不同类型的堆积过程形成的（即，用于实现最小和最大空隙比）。结果表明，堆积势指数与堆积过程几乎无关，但与混合物中复合颗粒的形状密切相关。然后，我们在数学上连接的堆积势指数的颗粒堆积密度模型中使用的颗粒相互作用参数。并对试验数据进行了分析，探讨了充填方式对砂粉土混合料孔隙比的影响。然后，我们提出了一种方法的框架内的颗粒堆积密度模型来预测砂粉土混合物的孔隙比在不同的包装程序与颗粒形状效应的考虑。
Packing procedure is the mechanical process of forming a packing of soil particles, such as funnel pouring, tamping, rodding, pluviation, compaction, vibration, compression, etc. For a sand-silt mixture, packing procedure and particle shape have significant effects on the density of the binary mixture. However, these two factors have not been considered in most of the existing particle packing density models. Thus, the existing particle packing density models are not applicable to sand-silt mixtures. In this paper, we aim to study the packing procedure and particle shape effects on density of binary mixtures. We firstly define a packing potential index, which is a measure of volume reduction potential due to mixing of two components of a binary mixture system under a packing procedure. To understand the nature of packing potential index, we compare the packing potential indices of 24 different types of mixtures collected from the literature; the 24 types of mixtures were formed by two different types of packing procedure (i.e., for achieving minimum and maximum void ratios). It is found that the packing potential index is nearly independent of packing procedure but significantly dependent on the compound particle shapes of a mixture. Then, we mathematically link the packing potential index to the particle interaction parameters used in the particle packing density models. And we analyze the data to discuss the effect of packing procedure on the void ratios of sand-silt mixtures. We then propose an approach within the framework of particle packing density model to predict the void ratios of sand-silt mixtures under different packing procedures with the consideration of particle shape effect.
影响因子：
5.2
作者：
G. Roquier
通讯作者：
G. Roquier