Energy efficiency of fibre reinforced soil formation at small element scale: Laboratory and numerical investigation
Energy efficiency of fibre reinforced soil formation at small element scale: Laboratory and numerical investigation
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DOI：
10.1016/j.geotexmem.2018.04.008
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发表时间：
2018-08-01
影响因子：
5.2
通讯作者：
Consoli, Nilo Cesar
中科院分区：
文献类型：
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作者：
Ibraim, Erdin;Camenen, Jean-Francois;Consoli, Nilo Cesar
本文探讨了在实验室制作的非增强和纤维增强样品的压实的能量消耗有关的方面。众所周知，对于固定的土壤密度，纤维的添加总是导致抗压实性的增加。然而，类似的峰值强度特性的致密的未加固的样品可以使用松散的粒状土壤基质混合少量的纤维。基于实验和离散元模型（DEM）的程序，本文表明，更少的压实能量所需的建设松散的纤维增强砂样比致密的未增强砂样，而两个样品表现出相似的峰值强度特性。除了证实宏观尺度的实验观察，DEM分析的结果提供了一个深入了解当地的微观机制，控制纤维-颗粒相互作用。这些评估的重点是孔隙比分布的演变，重新安排的土壤颗粒，动员的纤维中的应力，并在压实阶段的纤维取向分布的演变。
This paper explores the aspects related to the energy consumption for the compaction of unreinforced and fibre reinforced samples fabricated in the laboratory. It is well known that, for a fixed soil density, the addition of fibres invariably results in an increased resistance to compaction. However, similar peak strength properties of a dense unreinforced sample can be obtained using looser granular soil matrices mixed with small quantities of fibres. Based on both experimental and discrete element modelling (DEM) procedures, this paper demonstrates that less compaction energy is required for building loose fibre reinforced sand samples than for denser unreinforced sand samples while both samples show similar peak strength properties. Beyond corroborating the macro-scale experimental observations, the result of the DEM analyses provides an insight into the local microscale mechanisms governing the fibre-grain interaction. These assessments focus on the evolution of the void ratio distribution, re-arrangement of soil particles, mobilisation of stresses in the fibres, and the evolution of the fibre orientation distribution during the stages of compaction.