Abstract
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.
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