欢迎来到天天文库
浏览记录
ID:55658438
大小:429.05 KB
页数:6页
时间:2020-05-23
《考虑含水损伤的Q2黄土非线性蠕变模型研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第12卷第5期南水北调与水利科技Vo1.12No.52014年lO月South-to-NorthWaterTransfersandWaterScience&Technology()ct.2014DOI:10.13476/j.cnki.nsbdqk.2014.05.002考虑含水损伤的Q2黄土非线性蠕变模型唐皓,赵法锁,段钊。,宋飞(1.长安大学地质工程与测绘学院,西安710054;2.长安大学地质工程研究所,西安710054;3.西安科技大学地质与环境学院,西安710054)摘要:对Q2黄土进行不
2、同含水状态下的三轴蠕变试验,结果表明,随着含水率的增高,Q2黄土的流变性能增强。根据试验曲线形态特征,选用一个广义Kelvin模型串联一个非线性黏塑元件组成非线性黏弹塑性模型(改进的西原模型)。应用改进的西原模型对试验数据进行拟合求参,结果显示瞬时变形模量EH、黏弹性变形模量EK、黏弹性黏滞系数随含水率增加呈指数形式递减。引入含水损伤变量D(),计算得出各蠕变参数含水损伤演化方程,进而建立考虑含水损伤的非线性蠕变模型。应用试验数据对其进行验证,证明考虑含水损伤的非线性蠕变模型能够有效的描述Q2黄土
3、的整体流变特征。关键词:Q2黄土;蠕变试验;含水率;流变;非线性;损伤;模型中图分类号:TU432文献标志码:A文章编号:1672—1683(2014)05—0006—05StudyofnonlinearcreepmodelofQ2loessconsideringwaterdamageTANGHao,ZHA0Fa-suo一,DUANZhao0,SONGFeit(1.CollegeoJGeologyEngineeringandSurveyingEngineering,Chang’anUniversi
4、ty,Xi’an710054,China;2.InstituteofGeologicalEngineering,Chang’anUniversity,Xi’an710054,China;3.SchoolofGeologyandEnvironment,Xi’anUniversityofScienceandTechnology,Xi’an710054,China)Abstract:TriaxialcreepexperimentswereperformedonQ2loesswithdifferentmo
5、isturecontents.TheexperimentalresultsshowedthattherheologicalpropertiesofQ2loessstrengthenwiththeincreasingofmoisturecontent.Accordingtotheexperi—menta1curveshapecharacteristics,thenonlinearviscoelastoplasticmodel(improvedNishiharamode1)wasconstituted
6、bycon—nectingageneralizedKelvinmodelwithanonlinearviscoplasticbodyinseries.TheimprovedNishiharamode1wasusedtofitthetestdataandanalyzethemodelparameters,whichsuggestedthatinstantaneousdeformationmodulus(EH),viscoelasticmodulus(),andviscoelasticcoeffici
7、entofviscosity()decreaseintheexponentialformwiththeincreasingofmoisturecontent.ThewaterdamageparameterD(o2)wasintroducedtoderivethedamageevolutionequationofeachcreepparameter,andthenonlinearviscoelastop1asticmodelwithwaterdamageeffectwasestablished.Th
8、eexperimentaldatawereusedtoverifythemodel,andtheresultssuggestedthatthenonlinearcreepmodelconsideringwaterdamagecancharacterizetheoverallrheo—logicalpropertiesofO.eloesseffectively.Keywords:Q2loess;creepexperiment;moisturecontent;rheology;nonl
此文档下载收益归作者所有