Effect of the length of cylindrical particle on repose angle and porosity of a pile was numerically studied using discrete element method. The variation of repose angle and porosity with coefficient of sliding and rolling friction were also discussed. The results shown that compared with sphere particle, the bottom size of cylindrical pile is smaller, while the height of cylinder pile is larger and the heap is steeper. With the increase of the length of cylinder, the contour line of the pile becomes steep, and the angle of repose increases. The repose angle shows a positive correlation with coefficient of sliding and rolling friction. The porosity increases with the increase of the length of cylinders. The trends of porosity are basically consist with that of repose angle, and with increase of friction coefficient, the average porosity increases.

中文翻译：

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不同长度圆柱颗粒休止角和孔隙率分布的DEM研究

采用离散元法数值研究了圆柱颗粒长度对桩的安息角和孔隙率的影响。还讨论了静止角和孔隙率随滑动和滚动摩擦系数的变化。结果表明，与球形颗粒相比，圆柱桩的底部尺寸更小，而圆柱桩的高度更大，堆更陡峭。随着圆柱长度的增加，桩的轮廓线变得陡峭，休止角增大。安息角与滑动和滚动摩擦系数呈正相关。孔隙率随着圆柱体长度的增加而增加。孔隙度的变化趋势与休止角基本一致，随着摩擦系数的增加，平均孔隙度增加。