LIU Jia1 ，LIAN Feng2 ，LIU Zhi2 ，KONG Lingcen1 ，HOU Zhao1 ，LU Jiaqi1 ，YANG Zhen1 ，ZHANG Jiong1
1. School of Civil Engineering， Shandong University， Jinan 250061， China；
2. Shandong Academy of Building Research Co. ， Ltd. ， Jinan 250031， China
Objective To identify key factors influencing the angle of repose of gravel soil by analyzing the impact of Johnson-Kendall-Roberts （JKR） surface energy， restitution coefficient， static friction coefficient， and rolling friction coefficient， aiming to achieve a precise prediction of the angle.
Methods The Generic EDEM Material Model （GEMM） database was used to obtain key parameters for the EDEM model. A Box-Behnken central composite design was employed in the experimental scheme. Discrete element simulations of the gravel soil’s angle of repose were conducted using the Hertz-Mindlin with JKR contact model. MATLAB functions were utilized to extract the boundary particle coordinates from the pile profile and fit the slope profile.
Results and Discussion The optimal parameter combination for simulated gravel soil particles was found to be： JKR surface energy of 0. 05， rolling friction coefficient of 0. 1， static friction coefficient of 0. 39， and restitution coefficient of 0. 45. With this combination， the EDEM simulation yielded a gravel soil angle of repose of 35. 41°， with an average angular error of only 0. 854% compared to the measured value of 35. 11°. No significant difference was observed in the particle pile morphology.
Conclusion The study results indicate that JKR surface energy and rolling friction coefficient are significant factors affecting the angle of repose. These results provide valuable references for engineering applications.
Keywords：discrete element； gravel soil particle； particle reconstruction； contact model； MATLAB fitting
Get Citation:LIU Jia， LIAN Feng， LIU Zhi， et al. Key discrete element parameters influencing angle of repose formation of gravel soil［J］.China Powder Science and Technology，2025，31（1）：1−12.
Received:2024-05-28.Revised:2024-09-05,Online:2024-10-14.
Funding Project:国家自然科学基金项目，编号 ：52078279；国家重点研发计划项目，编号：2022YFB2601900；山东省重大科技创新项目重点研发计划，编号：2021CXGC011205。
First Author:刘佳（2001—），男，硕士研究生，研究方向为土壤颗粒仿真参数表征。E-mail：2022150029@sdu. edu. cn。
Corresponding Author:张炯（1980—），男，博士，教授，博士生导师，研究方向为透水路面孔隙堵塞防治技术。E-mail：jiongzhang@sdu. edu. cn。
DOI：10.13732/j.issn.1008-5548.2025.01.009
CLC No:TB4；TU521.1 Type Code:A
Serial No:1008-5548（2025）01-0001-12
