湛江组结构性黏土的强度特性试验分析

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1、AbstractSoftclaystrengthhasalwaysbeenhotanddifficultproblemsingeotechnicalengineering.Withtherapiddevelopmentofurbanconstruction,therearemoreandmoreexcavation,undergroundtunnelsprojectsinanumberofprojects,manyoftheseprojectsareconstructedinpre-consolid

2、ationpressureandunloadingcircumstances.However,theseunloadingprojectsusuallyusethestrengthindexofloadingtestswhendesign.However,loadingandunloadingaretwodistinctprocesses,thestudyofsoftclaystrengthcharacteristicsonunloadisagreatsenseofconstruction.Inth

3、ispaper,doingunconfinedcompressivestrengthtest,consolidatedundrainedtriaxialtestanddirectsheartestonloadingandunloading,refertothebasisonalargenumberofdomesticandinternationalreferences.Summary,analysisandcomparisonthetestresults,revealthestrengthchara

4、cteristicsofstructuralclay.Thisarticlecarryoutspecificworkandthemainresearchresultsareasfollows:1.Withdoingunconfinedcompressivestrengthtest,drawingthefigureoforiginalclaysunconfinedcompressivestress-straincurvesandreconstitutedclaysunconfinedcompressi

5、vestress-straincurves,andgetthesensitivityvalue,sbetween2.22tot2.95,thesensitivityvalueismiddle.Judgingzhanjiangclaysoilismiddlesensitivityvalue.2.Withdoingundrainedtriaxialconsolidationtest,getthecurvesoforiginalclaysunconfinedcompressivestress-strain

6、,andgetthestrengthindex(valuecandvalue)ofunconfinedcompressivestress-strain.Fromthestrengthenvelopeweknow,thestrengthenvelopeofzhanjiangsoftclayisnotalinearbutabrokenline,thatistosay,itsvaluecandvalueisvariable,valuecissmallerandvalueislargerwithhig

7、hconfiningpressure,onthecontrary,valuecislargerandvalueissmallerwithlowconfiningpressure.3.Underdifferentpre-consolidationpressure,unloadingshearstrengthindexandloadingshearstrengthindexarenotthesameyet.Underthesameverticalpressure,unloadingshearstren

8、gthindexofsoilarehigherthanloadingshearstrengthindex.that,thevaluecandvalueofunloadingishigherthanthevaluecandvalueIII万方数据ofloading.4.Consolidationfastshearstrengthonunloadingandconsolidationfastshearstrengthonloadingarenotthesame,the