The role of deposition process on pressure dip formation underneath a granular pile
The role of deposition process on pressure dip formation underneath a granular pile
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DOI：
10.1016/j.mechmat.2013.08.005
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发表时间：
2013-11-01
影响因子：
3.9
通讯作者：
Zhong, Zhijun
中科院分区：
文献类型：
--
作者：
Ai, Jun;Ooi, Jin Y.;Zhong, Zhijun
本文对颗粒状固体圆锥形堆中压力倾降现象进行了实验研究。研究了不同沉积工艺如浇注速度、浇注高度和沉积射流尺寸对压倾形成的影响。试验结果证实了顶沉桩中压力下降是一种较强的现象。当沉积射流半径明显小于最终桩半径（即集中沉积）时，中心出现倾倾，如以往研究所示。然而，当沉积射流半径与最终桩半径相当时（即弥漫性沉积），倾角的位置向沉积射流边缘移动，并在中心形成局部最大压力。对于集中沉积，增加浇注速度可以增加倾斜角的深度，减小倾斜角的宽度，而增加浇注高度在研究范围内的影响可以忽略不计。结果表明，压力降与下坡流的初始位置、强度和形式密切相关。(C) 2013年作者。Elsevier Ltd.出版。版权所有。
This paper describes an experimental investigation on the pressure dip phenomenon in a conical pile of granular solids. The roles of different deposition processes such as the pouring rate, pouring height and deposition jet size on the pressure dip formation were studied. Test results confirmed that the pressure dip is a robust phenomenon in a pile formed by top deposition. When the deposition jet radius is significantly smaller than the final pile radius (i.e. concentrated deposition), a dip developed in the centre as shown in previous studies. However, when the deposition jet radius is comparable to the final pile radius (i.e. diffuse deposition), the location of the dip moves towards the edge of deposition jet, with a local maximum pressure developed in the centre. For concentrated deposition, an increase in the pouring rate may enhance the depth of the dip and reduce its width, while an increase in the pouring height has only a negligible effect in the studied range. The results suggest the pressure dip is closely related to the initial location, intensity and form of downslope flows. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.