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():中国农业大学学报 2015,204174182-
JournalofChinaAriculturalUniversit gy:httuebao.cau.edu.cn∥xp:/DOI10.11841j.issn.10074333.2015.04.24-
基于离散单元法农田土壤单轴压缩模型的建立及参数校核
石林榕 吴建民 赵武云* 孙伟 张锋伟 孙步功
()甘肃农业大学工学院,兰州730070
摘 要 建立基于离散单元法的农田土壤单轴压缩可靠模型,并较准确模拟真实土壤力学性能,在有限元理论的
借助F利用E基础上,lunetF能将模型网格信息写出的特点,DEM软件自定义工厂生成不饱和土壤单轴压缩-UD
模型,并对其进行仿真试验。仿真试验结果表明:切向接触刚度和曲线的上升段与应变轴夹角、峰值、下降段与应变轴夹角均有关,上升段、下降段与应变轴夹角、峰值随切向接触刚度增大而增大;曲线的峰值在随临界切向应力减小而减小,下降段落点随临界切向应力减小而离原点越近;下降段与应变轴夹角随法向接触刚度增大而增大;下
33/、/、切向接触刚度为8临降段与应变轴夹角随临界法向应力减小而增大。当法向接触刚度为210MNm0MNm
界法向应力为3该组黏结参数能较可靠表征含水率为10kPa和临界切向应力为8kPa时,0.5%的耕地土壤力学特性。
关键词 单轴压缩;土壤;离散单元法;校核
()中图分类号 O347.7 文章编号 10074333201504017409 --- 文献标志码 A
arameterEstablishmentandverificationof p
farmlandsoilmodelinuniaxialcomression p
ondiscreteelementmethodbased
*,WU,Z,S,Z,SSHILinronJianinHAO WuunUN WeiHANGFeneiUNBuon - -m- -w -ggygg
(,G,L)ColleeofEnineerinansuAriculturalUniversitanzhou730070,China ggggy
Abstractarmlandsoilinuniaxialcomressionwasmodeledbasedondiscreteelementmethodandthemechanics F p
,roertofrealsoilwassimulated.OnthebasisofthefiniteelementtheorwiththeaidofFlunetDFthatdataoffinite -U ppyy
,eneratedelementmeshescanbewrittensoilmodelinuniaxialcomressionwasusinacustomfactorinEDEM gpgy
ositivesoftware.Simulationresultsshow:Shearstiffnessarerelatedwiththeincludedanlebetweenuwardsectionin pgp
,,curvesandthestrainaxisvaluetheincludedanlebetweendownwardsectionincurvesandthestrainaxis.eakthe gp
Peakointsinthecurvesdecreaseswithshearcriticalstressdecrease.Droofdownwardsectioninthecurvesarefar pp
ointawafromoriinalasshearcriticalstressdecrease.Includedanlebetweendownwardsectionincurvesandthe pygg
axisincreasesasnormalstiffnessdecrease.Peakincurvesincreasesasnormalcriticalstressincrease.Onthestrain
,basisofabovereularfromanalsinthecurvesofunaxialcomressionforcestrain4mainofatternarameters - gpygpp
bondinmodelthatsimulationmodelinuniaxialcomressionaliedwereadustedtomakecurvesofsimulationand gpppj
33/,/,,test.Thatiswhennormalstiffnessis210MNmshearstiffnessis80MNmnormalcriticalstressis30kPashear
,criticalstressis8kPathebondincanbemorereliabltocharacterizethemechanicalofsoilarameterroerties gyppp
holdin10.5%moisture.Thisresearchwillrovidereferenceformodelestablishinandarameterverificationof gpgp
ariculturalcomlexmaterials. gp
;s;d;cKewordsniaxialcomressionoiliscreteelementmethodalibration u py
收稿日期:20141023--
)基金项目:“十二五”国家科技支撑项目(2012BAD14B104-
:第一作者:石林榕,硕士研究生,E-mailetmao.com@qgq
:通讯作者:赵武云,教授,主要从事农业工程技术与装备研究,sau.edu.cnE-mailzhaow@gy
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