A behavioural framework for fibre-reinforced gravel

The mechanical behaviour of granular materials is known to be influenced by the addition of fibres. However, most previous research has been carried out on materials with relatively small grains (sands), and its application to larger grains is not well documented. This paper reports an investigation into the mechanical behaviour of a fibre-reinforced granular material with a relatively large grain size corresponding to one-third and one-fifth scale railway ballast. The investigation was carried out by means of triaxial tests incorporating a full-field, image-based deformation measurement technique; this enabled detailed observations to be made of each triaxial test specimen during shearing. The test data demonstrate the benefits of random fibre reinforcement for aggregates that have a relatively large grain size. Analysis taking into account the effect of fibre tension on the effective stresses experienced by the granular skeleton provides new insights into the mechanisms of reinforcement in larger sized ...

众所周知，纤维的添加会影响颗粒材料的力学性能。然而，以往的大多数研究是针对颗粒相对较小（如沙子）的材料进行的，其在较大颗粒材料上的应用并没有详细记录。本文报道了对一种纤维增强颗粒材料力学性能的研究，该材料颗粒尺寸相对较大，相当于铁路道砟的三分之一和五分之一尺寸。研究是通过三轴试验进行的，试验中采用了基于图像的全场变形测量技术；这使得在剪切过程中能够对每个三轴试验试件进行详细观察。试验数据证明了随机纤维增强对颗粒尺寸相对较大的集料的益处。考虑纤维张力对颗粒骨架所受有效应力影响的分析，为较大尺寸……的增强机制提供了新的见解。