Discrete element contact model and parameter calibration of sticky particles and agglomerates

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL Journal of Terramechanics Pub Date : 2024-06-29 DOI:10.1016/j.jterra.2024.100998
Zhifan Chen, Angxu Duan, Yang Liu, Hanqi Zhao, Chunyang Dai, Seng Hu, Xiaolong Lei, Jianfeng Hu, Lin Chen
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Abstract

The soil in southwest China is a cohesive soil in which discrete cohesive particles and aggregates coexist. In view of the problem that there are many studies on discrete cohesive particles and a lack of research on aggregates, discrete element software DEM is used to conduct a study on cohesive particles and agglomerates parameter calibration. The angle of repose is selected as the target value to calibrate the simulation parameters of sticky particles. Then, the simulation parameters of the viscous particles are used as the basis for the calibration of the contact parameters of the agglomerates, and shear experiments are conducted on the agglomerates, with the ultimate shear depth and ultimate shear force as target values. The results show that the parameters of the agglomerate are: Normal Stiffness per unit area is 5.627 × 108 N/m3, Shear Stiffness per unit area is 4.359 × 108 N/m3, Critical Normal Stress is 3.5 × 106 Pa, Critical Shear Stress is 4.5 × 106 Pa and Bonded Disk Radius is 5.43 mm. Through the particle sliding friction angle test and the agglomerate compression test, it was verified that the errors of sticky particles were 0.30 % and 0.37 % respectively, and the error of agglomerates was 1.69 %.

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粘性颗粒和团聚体的离散元素接触模型和参数校准
中国西南地区的土壤属于离散粘粒与团聚体共存的粘性土壤。针对离散粘性颗粒研究较多而团聚体研究较少的问题,采用离散元软件 DEM 对粘性颗粒和团聚体进行参数标定研究。选择休止角为目标值来校准粘性颗粒的模拟参数。然后,以粘性颗粒的模拟参数为基础校准团聚体的接触参数,并以极限剪切深度和极限剪切力为目标值对团聚体进行剪切实验。结果表明,团聚体的参数为单位面积法向刚度为 5.627 × 108 N/m3,单位面积剪切刚度为 4.359 × 108 N/m3,临界法向应力为 3.5 × 106 Pa,临界剪切应力为 4.5 × 106 Pa,粘结盘半径为 5.43 mm。通过颗粒滑动摩擦角试验和团聚体压缩试验,验证了粘性颗粒的误差分别为 0.30 % 和 0.37 %,团聚体的误差为 1.69 %。
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来源期刊
Journal of Terramechanics
Journal of Terramechanics 工程技术-工程:环境
CiteScore
5.90
自引率
8.30%
发文量
33
审稿时长
15.3 weeks
期刊介绍: The Journal of Terramechanics is primarily devoted to scientific articles concerned with research, design, and equipment utilization in the field of terramechanics. The Journal of Terramechanics is the leading international journal serving the multidisciplinary global off-road vehicle and soil working machinery industries, and related user community, governmental agencies and universities. The Journal of Terramechanics provides a forum for those involved in research, development, design, innovation, testing, application and utilization of off-road vehicles and soil working machinery, and their sub-systems and components. The Journal presents a cross-section of technical papers, reviews, comments and discussions, and serves as a medium for recording recent progress in the field.
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