Abstract Undrained cyclic responses of rubber-sand mixtures are essential for its applications in earthquake-prone areas. Hence, the present study is intended to examine the liquefaction behaviour and modeling the undrained cyclic responses of granulated rubber-sand mixtures with size of sand and granulated rubber less than 2 mm. The stress controlled undrained cyclic triaxial tests followed by undrained monotonic tests were carried out on mixtures with rubber content 0% (pure sand), 10%, 20%, 30%, 50%, 75%, and 100% (pure rubber) to examine liquefaction and post-liquefaction behaviour of the mixtures. The test results show that the mixture possesses higher liquefaction resistance when rubber content is between 30% and 50%. The post-liquefaction behaviour of the mixtures identified as pseudo-elastic-hardening and its corresponding modulus is found to vary marginally with its static modulus. In addition, the post-liquefaction strength of the mixtures is observed to be more than that of sand at the lower axial strain. Further, the undrained responses such as hysteretic behaviour and excess pore water pressure are modeled using Masing’s rule and the relation between degradation index (δ) and excess pore water pressure ratio (ru), respectively. The proposed model effectively predicts the cyclic behaviour of mixtures with rubber content between 10% and 75%.

中文翻译：

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粒状橡胶砂混合物的不排水循环响应

摘要 橡胶砂混合物的不排水循环响应对其在地震多发地区的应用至关重要。因此，本研究旨在检查液化行为并模拟砂粒和粒状橡胶小于 2 毫米的粒状橡胶-砂混合物的不排水循环响应。对橡胶含量为 0%（纯砂）、10%、20%、30%、50%、75% 和 100%（纯橡胶）的混合物进行应力控制不排水循环三轴试验，然后进行不排水单调试验，以达到检查混合物的液化和液化后行为。试验结果表明，当橡胶含量在30%～50%之间时，混合物具有较高的抗液化性能。发现混合物的液化后行为被确定为伪弹性硬化及其相应的模量与其静态模量略有不同。此外，在较低的轴向应变下，观察到混合物的液化后强度高于沙子的液化后强度。此外，不排水响应如滞后行为和超孔隙水压力分别使用马辛法则和退化指数 (δ) 与超孔隙水压力比 (ru) 之间的关系建模。所提出的模型有效地预测了橡胶含量在 10% 到 75% 之间的混合物的循环行为。不排水响应，如滞后行为和超孔隙水压力分别使用马辛法则和退化指数 (δ) 和超孔隙水压力比 (ru) 之间的关系建模。所提出的模型有效地预测了橡胶含量在 10% 到 75% 之间的混合物的循环行为。不排水响应，如滞后行为和超孔隙水压力分别使用马辛法则和退化指数 (δ) 和超孔隙水压力比 (ru) 之间的关系建模。所提出的模型有效地预测了橡胶含量在 10% 到 75% 之间的混合物的循环行为。