基于离散元的云南红壤仿真参数标定OA北大核心CSTPCD

In order to provide more accurate parameters for the design and optimization of soil contact components in red soil of Yunnan,the Hertz-mindlin with JKR Cohesion contact model in EDEM was used to calibrate the numerical simulation parameters of red soil in Yunnan.Firstly,the basic physical properties and contact parameters of red soil were determined by physical tests,and the parameters of simulation tests were determined based on the results of physical tests.The Plackett-burman test was carried out to screen the significant factors affecting repose angle of simulation tests,three parameters,the static friction coefficient between red soil and red soil,the recovery coefficient between red soil-45#steel plates and the surface energy of JKR,were obtained.Then the steepest climbing test was designed to optimize the optimal value range of significance parameters.And the Box-Behnken experiment was carried out to optimize the second-order regression equation by taking the repose angle of red soil on 45#steel plate as the response value,the optimal combination of contact parameters was obtained:the static friction coefficient of red soil-red soil was 0.502,the recovery coefficient of red soil-45#steel plate was 0.464,and the surface energy of JKR was 4.938 J·m-2.Finally,the optimal combination of contact parameters is used to carry out the simulation experiment,and the result shows that the error between the simulation result and the physical experiment is 1.7%,and there is no obvious difference.This result indicates that the reliability of the discrete element simulation parameters for the calibrated Yunnan red soil is relatively high,and it can provide basic parameters for the design and optimization of soil-engaging parts under the condition of red soil operation in Yunnan.