Debris avalanches have complex structures due to the internal discreteness of fragmentation events. From a meso perspective, a debris avalanche is essentially a collection of debris particles of various sizes. Friction and collision events are directly influenced by the gradation of debris particles, restricting the movement process of debris avalanches. Accordingly, a series of numerical simulations have been conducted to research the influence of motion behavior based on experimental tests. The results indicate that the inhomogeneous character of a debris avalanche creates a conducive particle structure for the movement of the debris avalanche, in which the fine particles can play a role in the conversion of sliding to rolling at the bottom, causing the reduction of friction dissipation and the differentiation of particle friction resistance along the vertical direction, which continues until deposition. Sudden decreases in friction resistance occurring on high-speed, fluid-like debris avalanches are primarily correlated to the particular particle structure due to the significant inhomogeneity of particle gradation.

中文翻译：

---

粒度级配对颗粒分离及碎屑崩塌运动行为的影响

由于碎片事件的内部离散性，碎片雪崩具有复杂的结构。从细观的角度来看，碎片雪崩本质上是各种尺寸的碎片颗粒的集合。摩擦碰撞事件直接受到碎片粒子级配的影响，制约了碎片雪崩的运动过程。因此，已经进行了一系列数值模拟以研究基于实验测试的运动行为的影响。结果表明，碎屑雪崩的不均匀性为碎屑雪崩的运动创造了有利的颗粒结构，其中细颗粒可以在底部滑动向滚动的转换中发挥作用，导致摩擦耗散的减少和颗粒摩擦阻力沿垂直方向的分化，这种情况一直持续到沉积。由于颗粒级配的显着不均匀性，发生在高速、流体状碎片雪崩上的摩擦阻力突然降低主要与特定的颗粒结构相关。