Zhifan Chen, Angxu Duan, Yang Liu, Hanqi Zhao, Chunyang Dai, Seng Hu, Xiaolong Lei, Jianfeng Hu, Lin Chen
Journal of Terramechanics, Volume 116, 2024, 100998, ISSN 0022-4898
https://doi.org/10.1016/j.jterra.2024.100998.(https://www.sciencedirect.com/science/article/pii/S0022489824000405)
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 %.
Keywords: Sticky particles; JKR model; Bonding model; Aggregates; Parameter calibration; Response surface methodology