The compression behaviour of the mixture of glass beads (representing rigid particles) and EPS beads (representing deformable particles) during the loading-unloading process is systematically examined through performing two sets of large-size oedometer experiments, including incremental step-by-step and one-step loading scenarios. At each step during the loading-unloading cycle, the void ratio (e) and the at-rest coefficient of lateral earth pressure (K₀) are measured for pure rigid samples and rigid-soft particle mixtures. To consider the creep effect, the overburden pressure at the final loading step is maintained on the sample for 24 h prior to unloading. The results show that at a given overburden pressure, with the addition of soft particles to the pure rigid aggregates, the values of e and K₀ decrease. Additionally, for both pure rigid samples and rigid-soft particle mixtures, with increasing the overburden pressure, e decreases whereas K₀ augments. Moreover, due to the creep behaviour during the constant loading step, K₀ decreases over time for both samples; a phenomenon which is observed to be more pronounced for pure rigid aggregates compared to rigid-soft particle mixtures. Finally, a well-established creep model is used to simulate the creep behaviour of pure rigid samples and rigid-soft particle composites.

中文翻译：

---

刚性颗粒-EPS珠复合材料的变形特性和蠕变行为

通过进行两组大型里程计实验，包括增量逐步和渐进式实验，系统地研究了玻璃珠（代表刚性颗粒）和EPS珠（代表可变形颗粒）混合物在加载-卸载过程中的压缩行为。一步加载场景。在加载-卸载循环期间的每个步骤中，测量纯刚性样品和刚软颗粒混合物的空隙率（e）和静态侧向土压力系数（K ₀ ）。为了考虑蠕变效应，在卸载之前将最终加载步骤中的覆盖压力保持在样品上 24 小时。结果表明，在给定的覆盖压力下，随着软颗粒添加到纯刚性骨料中， e和K ₀值减小。此外，对于纯刚性样品和刚软颗粒混合物，随着上覆压力的增加，e减小，而K ₀增大。此外，由于恒定加载步骤期间的蠕变行为，两个样品的K ₀随着时间的推移而减小；与硬质-软质颗粒混合物相比，纯刚性骨料的这种现象更为明显。最后，使用完善的蠕变模型来模拟纯刚性样品和刚软颗粒复合材料的蠕变行为。