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。
In this study,3D DEM simulations have been conducted to investigate the effect of interparticle 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.
作者
戴北冰
邓林杰
陈智刚
DAI Beibing;DENG Linjie;CHEN Zhigang(School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;Chongqing Construction Engineering First Municipal Engineering Company Limited,Chongqing 400020,China)
出处
《中山大学学报（自然科学版）（中英文）》
CAS
CSCD
北大核心
2023年第6期89-97,共9页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金(52078507)
广州市科技计划(202002030195)。
关键词
颗粒堆积体
离散单元法
摩擦系数
休止角
拱效应
granular heaps
discrete element method
friction coefficient
angle of repose
arching effect
