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Materials 2017, 10(12), 1382; doi:10.3390/ma10121382

Effect of Anisotropy on the Resilient Behaviour of a Granular Material in Low Traffic Pavement

ICube, UMR7357, CNRS, Université de Strasbourg, INSA de Strasbourg, 24 Boulevard de la Victoire, 67084 Strasbourg CEDEX, France
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Received: 30 October 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 3 December 2017
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Abstract

Granular materials are often used in pavement structures. The influence of anisotropy on the mechanical behaviour of granular materials is very important. The coupled effects of water content and fine content usually lead to more complex anisotropic behaviour. With a repeated load triaxial test (RLTT), it is possible to measure the anisotropic deformation behaviour of granular materials. This article initially presents an experimental study of the resilient repeated load response of a compacted clayey natural sand with three fine contents and different water contents. Based on anisotropic behaviour, the non-linear resilient model (Boyce model) is improved by the radial anisotropy coefficient γ3 instead of the axial anisotropy coefficient γ1. The results from both approaches (γ1 and γ3) are compared with the measured volumetric and deviatoric responses. These results confirm the capacity of the improved model to capture the general trend of the experiments. Finally, finite element calculations are performed with CAST3M in order to validate the improvement of the modified Boyce model (from γ1 to γ3). The modelling results indicate that the modified Boyce model with γ3 is more widely available in different water contents and different fine contents for this granular material. Besides, based on the results, the coupled effects of water content and fine content on the deflection of the structures can also be observed. View Full-Text
Keywords: granular material; repeated load triaxial tests; resilient deformation; anisotropy; finite element method granular material; repeated load triaxial tests; resilient deformation; anisotropy; finite element method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jing, P.; Nowamooz, H.; Chazallon, C. Effect of Anisotropy on the Resilient Behaviour of a Granular Material in Low Traffic Pavement. Materials 2017, 10, 1382.

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