Abstract The dynamic responses of granular materials subjected to cyclic loading under partially drained condition were seldom investigated, though the partially drained condition is commonly existing for the granular materials that locate nearby the drainage boundaries. Besides, the prevalent studies mainly focus on the liquefaction behaviour of granular materials under high stress levels. In this study, a granular fill material was chosen as testing material. A series of partially drained cyclic triaxial tests was conducted with low level of cyclic loading and high cycle number that are commonly experienced in the geostructures of transportation projects. Note that the cyclic triaxial test under partially drained condition is a model test rather than an element test since the distribution of excess pore water pressure is not homogeneous inside the specimen. The test results show that cyclic loading induces the reconstruction effect on the microstructure of the specimen, thereby changing the trend between permeability and void ratio. Under partially drained condition, the granular fill material normally experiences a sudden decrease of stiffness and a quick increase in deformation during the first cycles of loading, followed by gradually decreasing excess pore water pressure and stabilizing deformation. Importantly, the deformation response of the material can be contributed by two items: (a) that caused by densification effect of applied cyclic loading and (b) that due to the dissipation of excess pore water pressure. Two linear relationships were established to correlate the deformations with excess pore water pressure and applied cyclic loading.

中文翻译：

---

三轴条件下粒状填料的部分排水循环行为

摘要 局部排水条件下颗粒材料在循环荷载作用下的动力响应很少被研究，尽管部分排水条件下位于排水边界附近的颗粒材料普遍存在。此外，目前的研究主要集中在高应力水平下颗粒材料的液化行为。在这项研究中，选择粒状填充材料作为测试材料。进行了一系列部分排水循环三轴试验，循环载荷水平低，循环次数高，这在交通项目的地质结构中很常见。请注意，部分排水条件下的循环三轴试验是模型试验，而不是单元试验，因为超孔隙水压力在试件内部分布不均匀。试验结果表明，循环加载对试件微观结构产生重构效应，从而改变渗透率与孔隙率的变化趋势。在部分排水条件下，粒状填料在加载的第一个循环期间通常会经历刚度的突然降低和变形的快速增加，然后逐渐降低超孔隙水压力并稳定变形。重要的是，材料的变形响应可以由两项贡献：(a) 由施加的循环载荷的致密化效应引起的，以及 (b) 由于超孔隙水压力的消散。建立了两个线性关系以将变形与超孔隙水压力和施加的循环载荷相关联。