Processed tire wastes mixed with soils are applicable as lightweight fillers for slopes, subbases of pavements and retaining walls that may be subjected to seismic loads, e.g., earthquake or traffic loads. The dynamic response of granulated rubber-soil mixtures, such as the dynamic shear modulus, damping factors and liquefaction resistance, is essential in the design of such a system. This report presents the results of the dynamic behavior of granulated rubber-sand mixtures using resonant column tests and cyclic triaxial tests to assess the potential use of recycled rubber crumb in improving the performance of granular materials by mixing with different tire crumb sizes and fractions. Two contact types are identified that could explain the evolutionary behavior of the shear modulus and the damping ratio. The results of the rubber-sand mixtures are compared with the results from the literature. The mix ratio is shown to significantly influence the dynamic shear modulus and the liquefaction suscept...

Liquefaction of sand is the main cause of failure for earth structures during earthquakes. Some past research showed that the fabric anisotropy of soils in the ground can cause different responses to both static and dynamic loading. The inherent fabric anisotropy of sand due to the deposition history and pattern may also affect the liquefaction potential of the ground. In this study, a group of earthquake centrifuge tests was performed on models of a level ground to investigate its seismic response with the soil deposited by different angles. A special rigid container was designed and used to prepare the models. It was found that the fabric anisotropy greatly influenced the response of the ground in displacement, acceleration, and excess pore pressure. The models with larger deposition angles had higher liquefaction potential. The results show that liquefaction evaluation of a sand layer should take into account the influence of fabric anisotropy caused by its deposition history and pattern.