Cyclic axial interaction between anchor chain and sand directly influences the tension variation of mooring line in service. In Part I (Rui et al., 2021a), a series of monotonic loading tests have been conducted, but the cyclic interaction between chain and sand is still unrevealed. This paper developed an element testing database of cyclic chain-sand interaction results. The influences of cyclic amplitude, confining stress, chain nominal diameter, sand particle size and relative density on cyclic interaction were thoroughly investigated. It is found that the axial resistances in post-cyclic loading tests are always higher than the monotonic results. Cyclic amplitude has a significant influence on the chain-sand cyclic interaction. When cyclic displacement is less than half of the chain nominal diameter (d_b), the axial resistance gradually stabilizes after a few cycles. But when cyclic displacement is larger than d_b, the axial resistance shows an increasing trend due to the particle breakage, and stabilizes when the sand particle size distribution remains unchanged. A type of adjustment plateau with small constant axial resistance appears between unloading and reloading phases in chain-sand cyclic interaction curves. Stress release behind the chain link due to “soil arching” effect can explain the appearance of adjustment plateau.

锚链与沙子之间的循环轴向相互作用直接影响在役系泊缆的张力变化。在第一部分（Rui et al., 2021a）中，已经进行了一系列单调加载试验，但链与沙之间的循环相互作用仍未揭示。本文开发了循环链-砂相互作用结果的元素测试数据库。深入研究了循环振幅、围压、链标称直径、砂粒粒径和相对密度对循环相互作用的影响。发现后循环加载试验中的轴向阻力总是高于单调结果。循环振幅对链-砂循环相互作用有显着影响。当周期性移位小于链标称直径的一半（d _b)，轴向阻力在几个循环后逐渐稳定。但当循环位移大于d _{b 时}，轴向阻力因颗粒破碎而呈增加趋势，当砂粒粒度分布保持不变时，轴向阻力趋于稳定。在链-砂循环相互作用曲线中，卸载和重新加载阶段之间出现了一种具有较小恒定轴向阻力的调整平台。由于“土拱”效应导致链节后面的应力释放可以解释调整平台的出现。