Mixture of sand-expanded polystyrene (EPS) beads is one of the new geo-materials with high compressibility that can be used as a seismic buffer and base isolation due to its great capability for energy dissipation. In this study, a series of 1-g shaking table tests is conducted to assess the dynamic properties of the sand-EPS beads mixtures with a particular focus on the stress-strain response and the variation of shear modulus and damping ratio at the range of medium to large levels of strain. The influence of various parameters, including the amplitude of input base acceleration and EPS content, on the response of sand-EPS beads mixtures is examined. The physical model of sand-EPS bead mixtures showed a lower induced peak acceleration compared to the clean sand model. Moreover, the addition of EPS beads to sand reduced the deformations caused by dynamic loading. The results also revealed that the damping ratio and shear modulus of the samples depend on the EPS bead content, such that its increase results in the damping ratio increasing to 100% or more. On the contrary, the shear modulus of all sand-EPS bead mixtures undergoes a significant reduction with the increase in EPS bead content.

中文翻译：

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使用层流箱的沙-EPS珠粒混合物的振动台研究

砂膨胀聚苯乙烯（EPS）珠粒的混合物是一种具有高压缩性的新型土工材料，由于其能量耗散能力强，可用作地震缓冲和基础隔离。在本研究中，一系列 1- g进行振动台试验以评估沙子-EPS 珠粒混合物的动态特性，特别关注应力-应变响应以及在中到大应变范围内的剪切模量和阻尼比的变化。检查了各种参数（包括输入基础加速度的幅度和 EPS 含量）对沙子-EPS 珠粒混合物响应的影响。与干净的沙子模型相比，沙子-EPS 珠粒混合物的物理模型显示出较低的诱导峰值加速度。此外，在沙子中添加 EPS 珠减少了由动态载荷引起的变形。结果还表明，样品的阻尼比和剪切模量取决于 EPS 珠的含量，因此其增加导致阻尼比增加到 100% 或更多。相反，