基于甘蔗耕地黏土离散元参数标定的流变模型构建  

Construction of a rheological model based on discrete element parameters calibration of clay from sugarcane cultivated land

作　　者：张彪[1,2] 杨鑫三 王京云 陈警 沈卫民 ZHANG Biao;YANG Xinsan;WANG Jingyun;CHEN Jing;SHEN Weimin(Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology,School of Mechanical Engineering,Guangxi University,Nanning 530004,China;Academy of Sugarcane and Sugar Industry,Guangxi University,Nanning 530004,China)

机构地区：[1]广西制造系统与先进制造技术重点试验室,广西大学机械工程学院,南宁530004 [2]广西大学甘蔗与制糖产业学院,南宁530004

出　　处：《农业工程学报》2024年第13期36-44,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：中国博士后科学基金项目(2023MD734147);广西重大科技专项子课题项目(桂科AA22117004-1);广西制造系统与先进制造技术重点实验室主任课题项目(22-035-4S016);甘蔗与制糖产业学院专项科研项目(ASSI-2022002)。

摘　　要：针对华南宿根甘蔗的耕地土壤因多级复合团聚显现的逐层异构黏重性,为表征其特异性流变行为,该研究通过重黏土的离散元参数标定,构建团粒几何、力学属性多层演变的非匀质耕层模型,进而分析仿生壁板的推进阻力。结合休止角与三轴压缩试验及仿真结果,JKR表面能、恢复系数与动摩擦因数是影响重黏土流变响应的显著因子,不同耕层间参数差异明显。蕴含团粒级配分布、本征接触属性与黏聚特性的离散元模型具有表征多耕层复合流变性能的能力,通过三轴力学试验验证得到的本构响应偏差低于9.27%。采用该模型计算出的仿生耕作壁板推进阻力与土槽实测推进阻力之间的相对误差仅8.3%,表明对机具—土料互作关系的预测有效且较准确。研究结果可为触土部件适应性设计与动力学优化提供数据支持和模型参考。Rheological behavior can be used to characterize the multilevel composite agglomerates of cultivated soil for perennial sugarcane in South China.The intrinsic parameters,particle size distribution,and cohesive properties of soil were obtained using various physical and mechanical experiments,such as soil density,moisture content,clay particle size gradation screening,angle of repose and triaxial compression.According to the distribution of particle size within the ranges of different tillage depth and the Hertz Mindlin with JKR particle contact model,a systematic simulation was conducted on the angle of repose under clay flow.The contact factors were also screened and calibrated by the Plackett-Burman,the steepest climb and the Box-Behnken test.A multilayer model with nonhomogeneous discrete element was constructed using agglomerate geometric and mechanical properties.The discrete element parameters of heavy clay were used to explore the quantitative agglomerate generation,settling,platen undermining and layered stacking.According to the geometric composition of unsaturated soil particles and parameter assignments,such as JKR,the rheological constitutive behavior of soil was verified using the coupled triaxial compression on RecurDyn-EDEM.The rheological model of cane field tillage was verified to predict the tillage performance,and then to analyze the propulsion resistance of bionic wall plate.The angle of repose and soil triaxial compression showed that the JKR surface energy,coefficient of recovery and kinetic friction factor of the soil were the significant influencing factors on the rheological response of the heavy clay soil,with the contribution rates of 48.24%,30.09%and 7.80%,respectively.The measured angles of repose of the soil materials in different layers were used as the objective for optimization.The optimal solution of contact parameter was calibrated to evaluate the differences of the parameters among the different layers of the cultivated field.There was the similar between the simulated and expe

关 键 词：重黏土 离散元模型 参数标定 黏聚特性 流变行为 

分 类 号：S152.9[农业科学—土壤学]