Fibre-reinforced sand: interaction at the fibre and grain scale
Fibre-reinforced sand: interaction at the fibre and grain scale
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DOI：
10.1680/geot.14.p.206
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发表时间：
2015-01-01
期刊：
影响因子：
5.8
通讯作者：
Ibraim, E.
中科院分区：
文献类型：
--
作者：
Diambra, A.;Ibraim, E.
对于纤维增强颗粒土，纤维的效率取决于局部纤维-颗粒相互作用机制。这种局部相互作用机制进行评估，在本文中，通过使用修改后的版本的剪滞应力理论。虽然该理论提供了在纤维-基体界面水平上的应力传递机制的描述，但是它也产生了沿纤维的应力分布沿着。所提出的模型明确占的几何纤维和颗粒尺寸特性，纤维刚度，全球应力水平，土壤密度和土壤行为的非线性的影响。纤维和复合材料中的应变比的解析表达式，这是任何预测纤维贡献的基础，进一步推导。的控制参数的影响的讨论，而在复合材料水平的问题的比例放大，然后通过使用一个连续的本构模型进行适当的修改，占纤维和复合材料之间的应变比。对两种不同的砂与聚丙烯纤维的不同长径比的一系列三轴压缩试验的模型进行了验证。
For fibre-reinforced granular soils, the efficiency of the fibres is governed by the local fibre-grain interaction mechanism. This local interaction mechanism is evaluated, in this paper, by using a modified version of the shear-lag stress theory. While this theory provides a description of the stresstransfer mechanism at fibre-matrix interface level, it also generates the stress distribution along the fibre. The proposed model explicitly accounts for the effects of the geometrical fibre and granular size characteristics, fibre stiffness, global stress level, soil density and the non-linearity of soil behaviour. An analytical expression for the ratio of strains in the fibre and in the composite, which is fundamental for any prediction of fibre contribution, is further derived. A discussion on the effects of the controlling parameters is presented, while the scale-up of the problem at the composite level is then conducted by using a continuum constitutive model appropriately modified to account for the strain ratio between the fibre and the composite. The model is validated against a series of triaxial compression tests on two different sands mixed with polypropylene fibres of different aspect ratios.