It shows that, friction between particle surfaces is a main factor affecting the repose angle, and friction between particles and baseboard also affects free piling significantly therefore free rolling along the board needs to be restrained.
发现颗粒表面的摩擦系数是影响休止角的主要因素,颗粒与底板间的摩擦系数也影响自由堆积的休止角,因此需限制颗粒在底板边界上的滚动。
参考来源 - 堆积问题的离散元模拟—实验研究·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT Pilings are wooden, concrete, or metal posts that are pushed into the ground and on which buildings or bridges are built. Pilings are often used in very wet areas so that the buildings do not flood. 地桩 [usu pl]
...bridges set on stone pilings.
..建造在石桩上的桥。
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