Soil improvement by incorporating different reinforcement materials has been one of the most popular fields of study in geotechnical engineering since it can provide the engineers with a practical and relatively easy solution when dealing with various construction projects. Despite numerous studies carried out on the static behavior of reinforced soils, the dynamic characteristics of these mixtures have not been fully understood. Therefore, this paper aims to shed light upon this issue by conducting repeated loading triaxial tests on a sandy soil reinforced by different Waste Tire Textile Fiber (WTTF) contents. Various parameters such as permanent strain, resilient modulus, energy dissipation capacity, and damping ratio were investigated. The results of this study show that permanent strain is increased as a result of fiber addition. Nevertheless, rutting is not expected to occur since all soil-fiber mixtures are categorized in groups A (plastic shakedown) and B (plastic creep) of shakedown theory. Resilient modulus is increased up to 744% with an optimum WTTF content of 2%. Dissipated energy and damping ratio are also found to increase as a result of fiber inclusion. Furthermore, a new model is proposed to accurately predict the resilient modulus in terms of the number of cycles and fiber content.

通过掺入不同的增强材料来改善土壤质量一直是岩土工程领域最热门的研究领域之一，因为它可以为工程师提供处理各种建筑项目的实用且相对容易的解决方案。尽管对加筋土的静态性能进行了大量研究，但尚未完全了解这些混合物的动态特性。因此，本文旨在通过在不同废轮胎纺织纤维（WTTF）含量增强的砂土上进行重复加载三轴试验来阐明这一问题。研究了各种参数，例如永久应变，弹性模量，能量耗散能力和阻尼比。这项研究的结果表明，添加纤维会增加永久应变。不过，由于所有的土壤纤维混合物都被归类为减震理论的A组（塑性减震）和B组（塑性蠕变），因此预计不会发生车辙。弹性模量增加到744％，最佳WTTF含量为2％。还发现由于包含纤维，耗散的能量和阻尼比也会增加。此外，提出了一种新的模型，可以根据循环次数和纤维含量准确预测弹性模量。