Particle Size Effects on the Strength and Fabric of Granular Media
Particle Size Effects on the Strength and Fabric of Granular Media
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DOI：
10.1061/9780784482803.038
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
K. C. Kuei;J. DeJong;Alejandro Martinez
中科院分区：
文献类型：
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作者：
K. C. Kuei;J. DeJong;Alejandro Martinez
砾石土的表征和设计依赖于砂基方法，部分原因是对如何考虑颗粒大小和分布的影响的理解有限。在本文中，粒度对强度和织物的无粘性，粒状介质的影响进行了研究，使用离散元方法，通过测试试样的粒度分布（PSD）的不同系数的均匀性（CU）和平均粒径（d50）。初步结果表明，当所有的颗粒形状特征是相同的，增加d50产生等效的应力-应变响应相同的相对密度（DR）和CU。然而，当增加CU时，试样表现出更大的扩张趋势和更大的剪切强度。增大CU会导致接触力、应力和配位数的分布更加分散。与最小和最大密度相关的空隙比，以及剪切过程中的等体积条件也随着CU的增加而减小。
The reliance on sand-based methods for the characterization and design of gravelly soils is necessitated in part by a limited understanding of how to account for the effects of particle size and distribution. In this paper, particle size effects on the strength and fabric of cohesionless, granular media are investigated using the discrete element method by testing specimens with particle size distributions (PSDs) of differing coefficient of uniformity (CU) and mean grain size (d50). Preliminary results show that when all particle shape characteristics are equal, increasingd50yields equivalent stress-strain responses for the same relative density (DR) andCU. However, when increasingCU, specimens exhibit more dilative tendencies and greater shear strengths. IncreasingCUresults in more dispersive distributions of contact force, stress, and coordination number. The void ratios associated with minimum and maximum density, and constant volume conditions during shear also decrease with increasingCU.