Consideration of reinforcement mechanism in the short fiber mixing granular materials by granular element simulations
Consideration of reinforcement mechanism in the short fiber mixing granular materials by granular element simulations
复制标题
颗粒元模拟探讨短纤维混合颗粒材料的增强机理
DOI：
10.1051/epjconf/201714012020
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Kaneko and Y. Hashizume
中科院分区：
文献类型：
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作者：
K. Mori;K. Kaneko and Y. Hashizume
短纤维搅拌法是岩土工程中提高碎石土强度的方法之一。短纤维掺合料的力学性能受短纤维掺量、短纤维材料、短纤维长度、取向度等多种因素的影响。特别是短纤维的配合比在配合比设计中是非常重要的。在过去的研究中，我们通过一系列的三轴压缩实验了解到短纤维掺入过多会降低强度。也就是说，短纤维混合粒料土存在“最佳配合比”。在本研究中，为了探讨最佳配合比的产生机理，我们采用颗粒单元法进行了数值试验。结果表明，当颗粒-纤维接触点过多时，由于摩擦系数小于颗粒-纤维接触点的摩擦系数，强度降低。
The short fiber mixing method is well known as one of the method to improve the strength of gran- ular soils in geotechnical engineering. Mechanical properties of the short fiber mixing granular materials are influenced by many factors, such as the mixture ratio of the short fiber, the material of short fiber, the length, and the orientation. In particular, the mixture ratio of the short fibers is very important in mixture design. In the past study, we understood that the strength is reduced by too much short fiber mixing by a series of tri-axial compression experiments. Namely, there is “optimum mixture ratio” in the short fiber mixing granular soils. In this study, to consider the mechanism of occurrence of the optimum mixture ratio, we carried out the numerical experiments by granular element method. As the results, we can understand that the strength decrease when too much grain-fiber contact points exist, because a friction coefficient is smaller than the grain-grain contact points.