考虑含水损伤的Q2黄土非线性蠕变模型研究.pdf

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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