影响砂砾土堆积角形成的离散元关键参数  

Key discrete element parameters influencing angle of repose formation of gravel soil

作　　者：刘佳 连峰 刘治 孔令岑 候召 鲁嘉祺 杨臻 张炯[1] LIU Jia;LIAN Feng;LIU Zhi;KONG Lingcen;HOU Zhao;LU Jiaqi;YANG Zhen;ZHANG Jiong(School of Civil Engineering,Shandong University,Jinan 250061,China;Shandong Academy of Building Research Co.,Ltd.,Jinan 250031,China)

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]山东省建筑科学研究院有限公司,山东济南250031

出　　处：《中国粉体技术》2025年第1期98-109,共12页China Powder Science and Technology

基　　金：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。

摘　　要：【目的】明确影响砂砾土堆积角形成的关键因素,分析Johnson-Kendall-Roberts(JKR)表面能、碰撞恢复系数、静摩擦、滚动摩擦系数等因素对砂砾土堆积角的影响,实现对砂砾土堆积角的精确预测。【方法】使用Box-Behnken中心组合设计试验方案,采用Generic EDEM material model database(GEMM)数据库获取仿真试验关键参数;基于Hertz-Mindlin with JKR接触模型对砂砾土进行堆积角仿真试验;利用MATLAB函数曲线读取堆积形态轮廓线的边界颗粒坐标,拟合堆积斜面轮廓线。【结果】实际最优因素参数组合为砂砾土颗粒间JKR表面能、滚动摩擦系数、静摩擦系数和恢复系数,分别为0.05 J/m^(2)、0.1、0.39、0.45;EDEM仿真试验所得砂砾土堆积角为35.41°,与堆积角测量值(35.11°)误差为0.854%,且颗粒堆积形态无明显差异。【结论】砂砾土颗粒的JKR表面能和滚动摩擦系数是影响堆积角的重要因素。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 To obtain the key parameters of the simulation of gravel soil particles,a combination of physical experiment and simulation was employed,and the GEMM database was innovatively introduced,which significantly narrowed the range of key parameters.During the post-processing stage of the stacking angle of the materials,MATLAB image processing technology was used to fit the outer contour line of the stacked slope,thereby obtaining the material’s angle of repose.Response surface analysis was applied to analyze the significance of DEM parameters affecting the angle of repose of gravel soil.The impact of different contact parameters between particles on the angle of repose varied.The JKR surface energy and rolling friction coefficient between sand and gravel particles were significant factors affecting the tangen

关 键 词：离散元 砂砾土颗粒 颗粒重构 接触模型 数值模拟 

分 类 号：TB4[一般工业技术] TU521.1[建筑科学—建筑技术科学]