文档介绍：该【土木工程-外文翻译-外文文献-英文文献-土方工程的地基勘察与施工 】是由【jimilu】上传分享，文档一共【14】页，该文档可以免费在线阅读，需要了解更多关于【土木工程-外文翻译-外文文献-英文文献-土方工程的地基勘察与施工 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。DESIGNANDEXECUTIONOFGROUNDINVESTIGATIONFOREARTHWORKSPAULQUIGLEY,‘traditionalinvestigationmethods’lacialtill/‘geotechnicalcertification’-,gravel,%forthehardgreyblackDublinboulderclayupto20-25%forMidland,South-WestandNorth---(especiallythosewithintermediatetypesiltsandfinesandmatrix)havebeenrejectedattheselectionstage,‘poorormarginalsoils’(),itisvitalthattheearthworkscontractorfullyunderstandsthehandlingpropertiesofthesoils,,(SRW),:TrialpitsCablepercussionboreholesDynamicprobingRotarycoredrillingIn-situtesting(SPT,variableheadpermeabilitytests,geophysicaletc.)LaboratorytestingTheimportanceof‘phasing’thefieldworkoperationscannotbeoverstressed,‘refusal’,ratethroughverystiff,hardboulderclaysoilsduetocobble,,,,,urateassessmentofitsin-(1999)ordancewithBS1377(1990).Theengineeringdescriptionofasoilisbasedonitsparticlesizegrading,,boulderclaysoils(.‘mixedsoils’),prisehighlyvariableproportionsofsands,%(1999)nowrecognisesthesedifficultiesindescribing‘mixedsoils’–(whichisoftenunderestimated)inclassifyingandunderstandingthesesoilsispermeability(K).,triaxialcelltestsshouldbecarriedoutoneitherundisturbedsamples(U100’(-5to10-7m/s)canoftenbe‘conditioned’,withsmallreductioninmoisturecontent,-:MoisturecontentParticlesizegradingPlasticLimitCBRCompaction(relatingtooptimumMC)RemouldedundrainedshearstrengthAnumberofkeyfactorsshouldbeborneinmindwhenschedulinglaboratorytesting:Compaction/CBR/MCVtestsarecarriedouton<<,parison,,pactiondataisconsideredtoofferthebestmethodofestablishing(andchecking)’’sinthefieldonlowplasticityboulderclayswiththosecarriedoutlaterinthelaboratory(2to7days).ManyoftheaforementionedlowplasticityboulderclaysoilsexhibittimedependantbehaviourwithsignificantlydifferentMCV’srecordedatalaterdate–increasedvaluescanbeduetothedrainageofthematerialfollowingsampling,-,,,–,,::pactionEnd-pactionpactionisconsideredmorepractical,(TDD),thenin-situdensitycanbemeasured,,thein-situTDDcanbecheckedandnon-‘theoreticaldensities’.:Phasingthegroundinvestigationworks,particularlythelaboratorytestingExcavation&samplingindeeptrialpitsLargediameterhighqualityrotarycoredrillingusingair-mistorpolymergeltechniquesSmall-pactiontrialsonpotentiallysuitablecutmaterialPHASINGPhasinggroundinvestigationworksformanylargeprojectshasbeenadvocatedformanyyears–‘digest’orreviewthepreliminaryfindingsandre-,,(&MCVateachpointtakesinexcessoftwoweeks).Whenclassificationtests(moisturecontents,particlesizeanalysisandAtterbergLimits)’,,(usingtrenchbox)andin-,threedeeptrialpitscanproveinvaluableandthespoilmaterialalsousedtocarryoutsmall-,(typicallyinexcessof90%).,suchasthosearoundCavanandMonaghan,essfulinrecoveringverystiff/hardboulderclaysoilsfordeeproadcutareas(rate).In-situtesting(vanes,SPT’setc)%greaterthanconventionalHQcoresize,-PACTIONTRIALSTheundertakingofsmall-pactiontrialsduringthegroundinvestigationprogrammeisstronglyadvised,particularlywhere‘marginallysuitable’,:Achievablefielddensity,remouldedshearstrengthandCBREstablishingoptimumlayerthicknessandnumberofrollerpassespaction(staticvdynamic)Monitortrafficability&(CAT320orequivalent),25tdumptruck,D6dozerandeitheratowedorself--mendedasthisfacilitatesrapidmeasurementofmoisturecontents,,(U100)pactedfillcanbetakenforlaboratory