农业机械学报2025，Vol.56Issue(10)：353-364,12.DOI:10.6041/j.issn.1000-1298.2025.10.030
基于离散元的棉秆根系-土壤系统建模与起拔过程界面破坏机制研究
Modeling of Cotton Root-Soil System Based on Discrete Element Method and Investigation of Interface Failure Mechanisms during Uprooting Process
摘要
Abstract
In the current cotton stalk pulling process,the interaction mechanisms at the root-soil interface are highly complex,and there is a lack of high-fidelity simulation models,which significantly hinders the structural design and parameter optimization of pulling machinery.To address this issue,the discrete element method(DEM)was employed to construct a cohesive soil model and a root-soil composite system representative of typical cotton fields in Xinjiang,aiming to systematically reveal the interfacial mechanical responses and failure mechanisms during the pulling process.Soil bonding parameters were calibrated by using unconfined compression tests combined with a Box-Behnken design(BBD)optimization approach,yielding optimal values:normal bonding stiffness of 1.05 × 108 N/m3,tangential bonding stiffness of 3.09 × 108 N/m3,normal bonding strength of 6.95 × 105 Pa/m2,and tangential bonding strength of 6.69 × 105 Pa/m2.The axial pressure simulation error was 1.7％,confirming model accuracy.Using these parameters,a root-soil model was constructed in EDEM software and validated against field tests,with the predicted uprooting force(592.56 N)closely matching the measured value(598.2 N),showing a 1％error.Uprooting force-time curve analysis revealed four distinct response stages:elastic loading,peak loading,attenuation failure,and residual stabilization,reflecting shear stress buildup,bond rupture,root-soil slippage,and post-failure contact.The results showed that shear stress dominated resistance evolution,and the failure mode was jointly affected by root diameter and soil conditions.The research can provide an effective simulation framework for modeling root-soil systems for the design optimization of uprooting mechanisms.关键词
棉秆根系起拔力模拟/离散元/土壤粘结模型/根-土界面/破坏分析Key words
root uprooting simulation of cotton stalk/discrete element method/soil bonding model/root-soil interface/failure analysis分类
农业工程引用本文复制引用
亚森江·白克力,宋玲,岳勇,徐浩东,幸仁圣..基于离散元的棉秆根系-土壤系统建模与起拔过程界面破坏机制研究[J].农业机械学报,2025,56(10):353-364,12.基金项目
新疆维吾尔自治区青年科学基金项目(2022D01B91) （2022D01B91）
