The influence of inter-particle friction on the arching effect in granular heaps

DAI Beibing; DENG Linjie; CHEN Zhigang

doi:10.13471/j.cnki.acta.snus.2023B009

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The influence of inter-particle friction on the arching effect in granular heaps

Research articles | 更新时间：2023-12-08

- The influence of inter-particle friction on the arching effect in granular heaps
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 62, Issue 6, Pages: 89-97(2023)
- 作者机构：
  
  1.中山大学土木工程学院，广东珠海 519082
  2.南方海洋科学与工程广东省实验室（珠海），广东珠海 519082
  3.重庆建工第一市政工程有限责任公司，重庆 400020
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2023B009
  CLC： TU43
- Published：25 November 2023，
  
  Published Online：03 July 2023，
  
  Received：15 March 2023，
  
  Accepted：30 April 2023
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戴北冰,邓林杰,陈智刚.颗粒摩擦对散粒堆积体拱效应的影响[J].中山大学学报(自然科学版),2023,62(06):89-97.

DAI Beibing,DENG Linjie,CHEN Zhigang.The influence of inter-particle friction on the arching effect in granular heaps[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(06):89-97.
戴北冰,邓林杰,陈智刚.颗粒摩擦对散粒堆积体拱效应的影响[J].中山大学学报(自然科学版),2023,62(06):89-97. DOI： 10.13471/j.cnki.acta.snus.2023B009.

DAI Beibing,DENG Linjie,CHEN Zhigang.The influence of inter-particle friction on the arching effect in granular heaps[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(06):89-97. DOI： 10.13471/j.cnki.acta.snus.2023B009.

摘要

通过开展三维离散元数值模拟，研究了颗粒摩擦系数对散粒堆积体自然休止角、堆积体底部应力分布、堆积体内部接触力投影分布、强弱力链数量等宏细观特征的影响规律。研究表明：随颗粒摩擦系数的增大，自然休止角增大并逐步趋于一个饱和值，堆积体底部应力峰值位置则从堆积体底部中心逐渐往外迁移，堆积体底部中心接触力相对于底部峰值的减小程度逐步增加，应力凹陷现象与拱效应越明显；随着颗粒间摩擦系数增大，颗粒间接触力沿锥面方向投影的最大值方位（锥）角逐渐增大并趋于稳定，堆积体内部拱效应的优势发挥方位出现在偏离竖直轴15°~25°的方位。

Abstract

In this study， 3D DEM simulations have been conducted to investigate the effect of inter-particle friction on the macro and micro properties of granular heaps such as the angle of repose， stress distribution at the bottom， distribution of projected contact force， and number of strong and weak force chains， etc. The results indicate that increasing the inter-particle friction coefficient leads to an increase in the angle of repose

which eventually reaches a stable value. Additionally

the peak stress at the bottom migrates from the center outward

and the degree of reduction in contact force at the bottom center relative to the peak value increases. This results in a more pronounced stress dip and arching effect. The orientation angle of the conical surface

along which the maximum projection of contact forces occurs

increases with the increasing inter-particle friction coefficient and eventually stabilizes. The preferential direction for the mobilization of arching effect is oriented at 15°~25° relative to the vertical direction.

关键词

颗粒堆积体离散单元法摩擦系数休止角拱效应

Keywords

granular heapsdiscrete element methodfriction coefficientangle of reposearching effect

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CHEN Zhigang

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Chongqing Construction Engineering First Municipal Engineering Co. LtD.

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