论文标题
在膨胀/收缩周期下颗粒状材料的下坡爬行
Down-hill creep of a granular material under expansion/contraction cycles
论文作者
论文摘要
我们研究了由颗粒大小的振荡变化引起的一层颗粒材料层的下坡蠕变。该材料被建模为在重力作用下软盘的Athermal二维多分散系统。斜率角在临界静止角度以下，因此系统在静态外部条件下达到平衡构型。但是，在一种方案下，颗粒以绝对振荡的方式慢慢改变大小，观察到系统以同步的方式与振荡一起逐渐蔓延。我们每周循环的蠕变前进是斜率角度的函数和粒径变化程度。此外，我们考虑了粒径振荡幅度随深度降低的情况，这可能会被认为是在倾斜的地形中存在颗粒状土壤的情况下发生的。在这种情况下，由于观察到在田间发生，因此获得了最大表面并顺畅消失的蠕变轮廓。
We investigate the down-hill creep of a layer of granular material on a slope caused by an oscillatory variation of the size of the particles. The material is modeled as an athermal two dimensional polydisperse system of soft disks under the action of gravity. The slope angle is below the critical rest angle and therefore the system reaches an equilibrium configuration under static external conditions. However, under a protocol in which particles slowly change size in a quasistatic oscillatory way the system is observed to creep down in a synchronized way with the oscillation. We measure the creep advance per cycle as a function of the slope angle and the degree of change in particle size. In addition, we consider a situation in which the particle size oscillation amplitude decreases with depth, as it may be argued to occur in the case of a granular soil in an inclined terrain. In this case creep profiles that are maximum at the surface and smoothly vanish with depth are obtained, as it is observed to occur in the field.
