膨胀岩重塑样的力学特性试验分析与其工程应用

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1、三峡大学全日制专业学位硕士学位论文AbstractExpansiverockincludesseveralclayminerals,suchasMontmorillonite,KaoliniteandIllite,etc,andisakindofspecialrockswiththepropertiesofwaterabsorbtionswellingandwaterlossshrinking.Watercontentandexcavationunloadingarepartsofthemainexternalfactorsaffectmech

2、anicalpropertiesofexpansiverocks.BasedontheengineeringbackgroundofMiddleRouteofSouth-NorthProject,mechanicalpropertiesofcompactedexpansiverocksarestudiedbelowtheWestHighwayBridge(Pile3300)inBeitianvillageatAnyangsectionofHenanprovince.Maincontentsstudiedareasfollows.(1)Exper

3、imentalresearchonbasicphysicpropertiesandhittingpropertiesofexpansiverocks.Basicphysicpropertiestestsaremainlyfocusedonthenaturalwatercontents,densities,specificgravity,liquidandplasticlimit,aswellasfreeswellingratiooftheexpansiverocksindifferentburieddepths.Accordingtorelev

4、antspecifications,theexpansiverocksbelowtheWestHighwayBridge(Pile3300)inBeitianvillageatAnyangsectionofMiddleRouteofSouth-NorthProjectareweakswellingrocks.Optimalwatercontentsandmaximumdrydensitiesofexpansiverocksindifferentburieddepthsareobtainedbyhittingtests(2)Shearstreng

5、thtestresearchoncompactedexpansiverockswithdifferentwatercontents.Therelationshipbetweenshearstrengthparametersandwatercontentshowstheoveralltrendsthatcohesionandfictionanglesdecreasewiththeincreaseofwatercontentsandthereisanearlylinearrelationshipbetweencohesionandwatercont

6、entbyfitting.(3)Triaxialcompressiontestresearchoncompactedexpansiverockswithdifferentwatercontents.Watercontenthasalargeeffectonthestress-strainrelationship,mechanicalstrength,deformationandfailureproperties.Thestress-straincurvesofexpansiverocksshowpropertiesofstrainhardeni

7、ng，andthestressstraindiagramcanbeclassifiedintofourperiods，namelycompactionperiod,linearelasticperiod,yieldperiodandstrainhardeningperiod.Thepeakstrengthdecreaseswiththeincreasingofwatercontents,butitincreaseslinearlywiththeincreasingofconfiningpressure.Theshearstrengthparam

8、etersshowtheoveralltrendswiththeresultsofdirectsheartest.Thecollapsemechani