《海上風電場工程巖土試驗規(guī)程》（NB／T 10107-2018）英文版

ICS27.180

P61

RecordNumber:J2649-2019NB

ENERGYSECTORSTANDARD

OFTHEPEOPLE’SREPUBLICOFCHINA

中華人民共和國能源行業(yè)標準

PNB/T10107-2018

SpecificationforGeotechnicalTestsofOffshore

WindPowerProjects

海上風電場工程巖土試驗規(guī)程

（征求意見稿）

IssuedateDecember25,2018ImplementationdateMay1,2019

IssuedbyNationalEnergyAdministrationofthePeople’sRepublicofChina

ENERGYSECTORSTANDARDOFTHEPEOPLE’SREPUBLICOFCHINA

SpecificationforGeotechnicalTestsofOffshoreWindPowerProjects

NB/T10107-2018

*

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Introduction

ThisEnglishversionisoneofChina’senergysectorstandardseriesinEnglish.Itstranslation

wasorganizedbyChinaRenewableEnergyEngineeringInstituteauthorizedbyNational

EnergyAdministrationofthePeople’sRepublicofChinaincompliancewithrelevant

proceduresandstipulations.ThisEnglishversionwasissuedbyNationalEnergy

AdministrationofthePeople’sRepublicofChinainAnnouncement[2018]No.16datedDec

25,2018.

ThisversionwastranslatedfromtheChinesestandardNB/T10107-2018,Specificationfor

GeotechnicalTestsofOffshoreWindPowerProjects,publishedbyChinaWater&Power

Press.ThecopyrightisreservedbyNationalEnergyAdministrationofthePeople’sRepublic

ofChina.Intheeventofanydiscrepancyintheimplementation,theChineseversionshall

prevail.

Manythanksgotothestafffromtherelevantstandarddevelopmentorganizationsandthose

whohaveprovidedgenerousassistanceinthetranslationandreviewprocess.

ForfurtherimprovementoftheEnglishversion,allcommentsandsuggestionsarewelcome

andshouldbeaddressedto:

ChinaRenewableEnergyEngineeringInstitute

No.2Beixiaojie,Liupukang,XichengDistrict,Beijing100120,China

Website:

Translatingorganization:

Translatingstaff:

Reviewpanelmembers:

翻譯出版說明

本譯本為國家能源局委托水電水利規(guī)劃設(shè)計總院按照有關(guān)程序和規(guī)定，統(tǒng)一組織翻

譯的能源行業(yè)標準英文版系列譯本之一。2018年12月25日，國家能源局以2018年第

16號公告予以公布。

本譯本是根據(jù)中國水利水電出版社出版的《海上風電場工程巖土試驗規(guī)程》NB/T

10107-2018翻譯的，著作權(quán)歸國家能源局所有。在使用過程中，如出現(xiàn)異議，以中文版

為準。

本譯本再翻譯和審核過程中，本標準編制單位及編制組有關(guān)成員給予了積極協(xié)助。

為不斷提高本譯本的質(zhì)量，歡迎使用者提出意見和建議，并反饋給水電水利規(guī)劃設(shè)

計總院。

地址：北京市西城區(qū)六鋪炕北小街2號

郵編：100120

網(wǎng)址：

本譯本翻譯單位：

本譯本翻譯人員：

本譯本審核人員：

AnnouncementofNationalEnergyAdministrationof

thePeople’sRepublicofChina

[2018]No.16

AccordingtotherequirementsofDocumentGNJKJ[2009]No.52NoticeonReleasing

theEnergySectorStandardizationAdministrationRegulations(tentative)anddetailed

implementationrulesissuedbyNationalEnergyAdministrationofthePeople'sRepublicof

China,204sectorstandardssuchasCodeforEngineeringGeologicalInvestigationof

PhotovoltaicPowerProjects,including32energysector(NB)standardsand172electric

powersector(DL)standards,areissuedbyNationalEnergyAdministrationofthePeople's

RepublicofChinaafterduereviewandapproval.

Attachment:DirectoryofSectorStandards

NationalEnergyAdministrationofthePeople'sRepublicofChina

December25,2018

Attachment:

DirectoryofSectorStandards

SerialReplacedStandardApprovalImplementa

StandardNo.Title

numberstandardNo.No.date

tiondate

...

Specificationfor

GeotechnicalTestsofDecember

8NB/T10107-2018May1,2019

OffshoreWindPower25,2018

Projects

...

Foreword

AccordingtotherequirementsofDocumentGNKJ[2015]No.12“NoticeonReleasing

theSecondBatchofIndustrialStandardFormulation(Revision)PlaninEnergySectorin

2014”issuedbyNationalEnergyAdministrationofthePeople'sRepublicofChina,this

Specificationispreparedbytheprocedurepreparationteamafterextensiveinvestigationand

researchthroughcarefullysummarizingpracticalexperiencesandreferringtorelevant

internationalandforeignadvancedstandardsonthebasisofextensiveconsultation.

ThemajortechnicalcontentsofthisSpecificationare:PreparationandSaturationof

Specimen,PhysicalPropertyTestsofSoil,MechanicalPropertyTestsofSoil,In-situTests,

WaterQualityAnalysis,SoilQualityAnalysis,ClayMineralsAnalysis,SubmarineShallow

GasandGassySoilTests,andPhysicalandMechanicalPropertyTestsofRock.

UnderthemanagementoftheNationalEnergyAdministrationofthePeople'sRepublic

ofChina,thisSpecificationisproposedanddailymanagedbytheChinaRenewableEnergy

EngineeringInstitute,andexplainedbytheWindPowerPlantPlanningandDesignTechnical

Sub-committeeoftheWindPowerStandardizationTechnicalCommitteeintheEnergySector.

Incaseofanycommentsorsuggestionsintheimplementationprocess,pleasesendto:

ChinaRenewableEnergyEngineeringInstitute

No.2Beixiaojie,Liupukang,XichengDistrict,Beijing100120,China

Chiefdevelopmentorganization:

POWERCHINAHuadongEngineeringCorporationLimited

Participatingdevelopmentorganizations:

ZhejiangHuadongConstructionEngineeringCo.,Ltd.

ZhejiangHuadongEngineeringSafetyTechnologyCo.,Ltd.

HohaiUniversity

ChangjiangRiverScientificResearchInstituteofChangjiangWater

ResourcesCommission

WuHanUniversity

NanjingUniversity

WuhanInstituteofRockandSoilMechanics,theChineseAcademyof

Sciences

Chiefdraftingstaff:

WangMingyuanShanZhigangRaoXibaoHuangBin

XuGaofengShenYangWangkuanjunLiXinyi

HuShenggangZuoYongzhenYangTaoWangYong

WangZhenhongZhouYuefengZhouLipeiZhuXiaoCai

ChengWuweiXuXueyongWangYanliDiShengjie

DuWenboBuLingfangXuHanZhangKun

ChenYunXiongXiaoSunMiaoJunXunCaiyun

Reviewerpanelmembers:

WangHuimingLiWengangZhongJianpingLiXiaoquan

AoDahuaYangShouhuaFengBeileiLaiXianghua

HuangBincaiLuXinjingLiuYanhuaWangDong

WangYajunLiMoQinWeifengPuLing

LiShisheng

1GeneralProvisions

1.0.1Thisspecificationisformulatedtostandardizetheworkingcontentsandtechnical

requirementsforgeotechnicaltestsofoffshorewindpowerprojects,andensurethequalityof

testsandresults.

1.0.2Thisspecificationisapplicabletothegeotechnicaltestsofoffshorewindpowerprojects.

1.0.3Inadditiontothisspecification,thegeotechnicaltestsofoffshorewindpowerprojects

shallalsomeettherequirementsofcurrentrelevantnationalstandards.

1

2TermsandSymbols

2.1Terms

2.1.1thermalconductivity

theheatpassingthroughunitareasoilinunittimeunderunittemperaturegradient.

2.1.2ringsheartest

alarge-displacementsheartestfortorsionalshearofaringspecimen,keepingboththeshear

areaandthenormalstressconstant.

2.1.3soil-steelpileinterfacebehaviourtest

atesttodeterminetherelationshipbetweentheshearstressandsheardisplacementonthe

interfaceaswellasthestrengthcurveontheinterfacebyapplyingacertainnormalstresson

theinterfacebetweensoilandsteelpipepiletoenabletheinterfacetogenerateshear

displacementalongthetangentialdirection.

2.1.4triaxialcreeptest

atypeoftriaxialcompressiontesttomeasurethetime-dependentaxialstrainandvolume

strainofspecimenbyapplyingaxialpressureingradesorseparatelyunderacertainconfining

pressuretokeepaconstantload.

2.1.5truetriaxialtest

atypeoftriaxialcompressiontestsubjecttothreeindependentprincipalstresses.

2.1.6hollowcylinderdynamictorsionalsheartest

atesttodeterminethedynamicstress-strainrelationship,dynamicstrength,dynamicshear

modulus,dynamicelasticmodulusanddampingratiobysynchronouslyapplyingaxialforce

andtorquevariedonaregularbasisonahollowcylinderunderacertainlateralpressure.

2.1.7miniaturevanesheartest

atesttodeterminetheundrainedshearstrengthofsaturatedsoftclaybypressingtheminiature

vanewithacertainsizeverticallyintothesoilandshearingitatacertaintorsionrate.

2.1.8T-barpenetrationtest

atypeoffull-flowstaticpenetrationtestinwhichaT-barprobeispenetratedintothesoilata

specifiedrateandtheresistanceoftheprobeismeasuredsimultaneouslyinthepenetration

process.

2.1.9ballpenetrationtest

atypeoffull-flowstaticpenetrationtestinwhichaballprobeispenetratedintothesoilata

specifiedrateandtheresistanceoftheprobeismeasuredsimultaneouslyinthe

2

penetrationprocess.

2.1.10gassysoil

atypeofsubmarinedepositcontainingclosedgasatapressurehigherthanatmospheric

pressure.

2.1.11submarineshallowgas

thegasmainlyconsistingofmethane,carbondioxide,hydrogensulfideandethanedepositedin

thesubmarineshallowsediments.

2.2Symbols

2.2.1Sizeandtime

N——numberofvibrations;

V——specimenvolume;

ω——circularfrequency.

2.2.2Physicalindicators

Cu——non-uniformitycoefficient;

Dr——relativedensity;

e——voidratio;

Gs——specificgravityofsoilgrain;

IL——liquidityindex;

IP——plasticityindex;

m——specimenmass;

Sr——saturationdegree;

w——watercontent;

wL——liquidlimit;

wP——plasticlimit;

ρd——drydensityofsoil.

3

2.2.3Mechanicalindicators

av——compressioncoefficient;

Bq——coefficientofporepressureinpiezoconepenetrationtest;

Cs——swellingindex;

Cv——consolidationcoefficient;

Cα——secondaryconsolidationcoefficient;

Ee——swellingmodulus;

Es——compressionmodulus;

E0——deformationmodulus;

Ese——undrainedsecantmodulus;

fs——sidefrictionofconepenetrationtest;

Gd——dynamicshearmodulus;

K0——coefficientofstaticlateralpressure;

mv——volumecompressioncoefficient;

pc——pre-consolidationpressure;

ps——specificpenetrationresistance;

qc——coneresistance;

qu——unconfinedcompressivestrength;

St——sensitivity;

u——porewaterpressure;

Vp——velocityofcompressionwave;

Vs——velocityofshearwave;

ε50——axialstraincorrespondingto50%peakprincipalstressdifferenceinthe

4

unconsolidatedandundrainedsheartest.

5

3BasicRequirements

3.0.1Thegeotechnicaltestsofoffshorewindpowerprojectsshallbedeterminedaccordingto

thesitegeologicalconditionsanddesignrequirements.

3.0.2Therocksandsoilofoffshorewindpowerprojectsshallbeclassifiedinaccordance

withtherelevantprovisionsofthecurrentnationalstandardGB50021,CodeforInvestigation

ofGeotechnicalEngineering.

3.0.3Thetestmethodsforphysicalandmechanicalpropertiesofrockandsoilinoffshore

windpowerprojectsshouldbeselectedaccordingtoAppendixAofthisSpecification,and

therequirementsandmanagementofspecimensshallcomplywiththerequirementsof

AppendixBofthisSpecification.Thespecimenmassgradingrequirementsforlaboratory

testsandthesamplingmethodsofspecimensfordifferentlevelsshallcomplywiththe

relevantprovisionsofthecurrentnationalstandardGB50021,CodeforInvestigationof

GeotechnicalEngineering.

3.0.4Dataprocessingandstatisticalanalysisofgeotechnicaltestsshallcomplywiththe

relevantprovisionsofthecurrentnationalstandardGB50021,CodeforInvestigationof

GeotechnicalEngineering.

3.0.5Theinstrumentsandequipmentusedinthegeotechnicaltestsshallcomplywiththe

relevantprovisionsofthecurrentnationalstandardGB/T15406,PrimaryParameterand

GeneralSpecificationforGeotechnicalEngineeringInstrument”,andshallbetestedor

calibratedandverified.

3.0.6Thesensoroftheinstrumentandequipmentshallbecalibratedregularlyorbeforethe

test.Incaseofanyabnormalityinuse,itshallberecalibrated.Thesensors,wiresand

measuringinstrumentsusedinthecalibrationshallbethesameasthoseusedinthetest.

3.0.7Nationalcertifiedreferencematerialsshallbeusedforchemicalanalysisfortraceability.

3.0.8Thediscardedspecimensofgeotechnicaltestshallbeplacedinsuchpositionas

specifiedbythecompetentenvironmentaladministrativedepartment,whichshallnotbe

dumpedorstackedcasually.

3.0.9Specialmeasuresshallbetakentoensurethesafetyofequipmentandpersonnel

accordingtothesiteconditionspriortothein-situtests.

3.0.10Exceptforspecialrequirements,thewaterusedintestshallbepurewater.

6

4PreparationandSaturationofSpecimen

4.1GeneralRequirements

4.1.1Thegrainsizeofthepreparedspecimenshouldnotbegreaterthan20mm,andthe

specimenwithagrainsizeofgreaterthan20mmshallbeinaccordancewiththerelevant

provisionsofthecurrentnationalstandardGB50123,StandardforSoilTestMethod.

4.1.2Oneortwomorespecimensshouldbepreparedforstandby.Themaximumallowable

densitydifferenceofthesamegroupofundisturbedspecimensshouldnotbegreaterthan

0.03g/cm3,andthemaximumallowabledifferenceofwatercontentshouldnotbegreaterthan

2%.Theallowabledifferencebetweenthedensityofdisturbedspecimensofthesamegroup

andthatrequiredasperthepreparationstandardshouldnotbegreaterthan0.02g/cm3,andthe

allowabledifferencebetweenthewatercontentandthatrequiredasperpreparationstandard

shouldnotbegreaterthan1%.

4.2SpecimenPreparation

4.2.1ThepreparationforconsolidationTest,directsheartestandpermeabilityTestof

undisturbedsoilspecimenshallsatisfythefollowingrequirements:

1Thesoilspecimenshallbeplacedinthecorrectdirectionasindicatedonthesoil

specimencylinder,andthestructureofthesoilspecimenshallbecheckedoncethecylinderis

opened.Incasethesoilspecimenisseriouslydisturbedorthequalityofthesoilspecimenfails

tosatisfytherequirements,noundisturbedsoilspecimenshallbeprepared.Theupperand

lowerlayersofthesoilspecimenshallbeidentifiedfurther,andbothendsofthesoilspecimen

shallbeleveled.

2Athinlayerofvaselineshallbecoatedontheinnerwallofthecuttingringforthetest

beforetheplacementofthecuttingedgeonthesoilspecimendownward.Cutthesoil

specimenintoasoilcolumnwiththediameterslightlylargerthanthatofthecuttingring,and

thenpressdownthecuttingringverticallyuntilthesoilspecimenextendsoutofthecutting

ring.Thespecimenandthecuttingringshallbeconnectedclosely.Removetheremainingsoil

atbothendsandlevelit.Cleantheouterwallofthecuttingring,andweighthetotalmassof

thecuttingringandthesoilwithanaccuracyof0.1g.

3Observethesoilspecimencarefullyinthecuttingprocess.Describethelayer,smell

andcolorofthespecimen.Inaddition,recordanyimpurity,uniformityandcrackofthe

specimen.

4Theremainingundisturbedsoilspecimenshouldbewrappedinwaxpaperandputin

7

thehumidcontainerforsupplementarytestuse;theremainingrepresentativecutsoilmaybe

usedforthephysicaltest.

5Determinewhetherthespecimenissaturateddependingonitsnatureandtest

requirements.Whenthespecimenisnottestedimmediatelyorsaturated,itshallbestoredin

thehumidcontainertemporarily.

4.2.2Thespecimenpreparationofundisturbedsoilforunconfinedcompressivestrengthtest,

triaxialcompressiontest,triaxialcreeptest,dynamictriaxialtestandresonantcolumn

testshallmeetthefollowingrequirements:

1Theratioofheighttodiameterofthesoilspecimenshallbe2.0to2.5.Whenthe

diameterofthespecimenislessthanorequalto100mm,themaximumallowablegrainsizeis

1/10ofthespecimendiameter.Whenthediameterisgreaterthan100mm,themaximum

allowablegrainsizeis1/5ofthediameter.

2Thesoilspecimenshallbeplacedinthecorrectdirectionasindicatedonthe

specimencylinder,andthestructureofthesoilspecimenshallbecheckedonceopened.In

casethesoilspecimenisseriouslydisturbedorthequalityofthesoilspecimenfailstosatisfy

therequirements,noundisturbedsoilspecimenshallbeprepared.

3Forasoftsoilspecimen,cutandobtainasoilcolumnslightlylargerthanthespecified

sizewithawiresaworasoilcutter,andplaceitbetweentheupperandlowerpartsofthe

cuttingplate.Thencutthecolumnfromtoptobottombythewiresaworsoilcutterclosetothe

sideplateandrotatetheplatewhilecuttinguntilspecimendiameterreachesthespecified

value.Leveltheupperandlowerendsbythespecimenheight.

4Forahardsoilspecimen,cutandobtainasoilcolumnslightlylargerthanthespecified

sizewithasoilcutterorwiresaw,andleveltheupperandlowerends.Placethespecimenon

thecutterframebythelayerdirectionrequiredbyspecimen,andcutwithasoilcutter.Firstly,

applyathinlayerofoilontheinnerwallofthecutterblade,andalignthecutterbladewith

thetopsurfaceofthespecimen.Cutthespecimenwhilepressingthecutteruntilitisabout

2cmhigherthantherequiredspecimen.Thendisassemblethecutter,takeoutthespecimen,

andlevelthetwoendstoarequiredheight.

5Thetwofacesofthespecimenshallbeflat,evenandinparallel,andthesidesshallbe

perpendiculartothefaces.Intheprocessofsamplecutting,holesformedbygravelonthe

surfaceofspecimenmaybefilledwithresidualsoil.

6Weighthecutspecimen.Theweightofthespecimenwithadiametergreaterthan

100mmshallbeaccurateto1.0g,whilethatwithadiameterlessthanorequalto100mmshall

beaccurateto0.1g.Taketheresidualsoilandtestthewatercontentatthesametime.Thetest

8

forthewatercontentshallnotbelessthantwogroups,andthedifferenceofthewater

contentshallmeettherequirementsofArticle4.1.2ofthisSpecification.

4.2.3Thepreparationforthedisturbedfine-grainedsoilspecimenshallmeetthefollowing

requirements:

1Describethecolor,soiltype,smellandinclusionsofthedisturbedsoilspecimen.The

disturbedsoilmaybefullymixed,andtaketherepresentativespecimentomeasurethewater

content.

2Putthedisturbedblockspecimenonarubberplateforcrushingwithawoodrolleror

soilcrusher,andthegrainshallnotbecrushed.Whenthewatercontentishigh,itcanbe

air-drieduntilitiseasytobecrushed.

3Sievethecrushedspecimen.Whenthediameterofspecimenislessthanorequalto

100mm,themaximumallowablegrainsizeis1/10ofthediameter.Whenthediameterof

specimenisgreaterthan100mm,themaximumallowablegrainsizeis1/5ofthediameter.

4Usequarterdiagonalsamplingmethodorsandseparatortotakeenoughrepresentative

specimensuponsieving,andputsuchspecimensintotheglasscylinder.Suchspecimenshall

belabeled.Forair-driedsoil,thewatercontentshallbetested.

5Calculatetheamountofair-driedsoilandwaterrequiredforspecimenpreparation

accordingtothedrydensityandwatercontentasrequiredbymoldvolume.Spraythewater

tobeaddedonthesoilandmixthemwell.Putthemixtureintoaplasticbagafterawhile,and

thenputsuchinaclosedcontainerforatleast20hourstomakethewatercontenteven.Take

outthesoilandretestthewatercontent,whichshouldmeettherequirementsofArticle4.1.2

ofthisSpecification.

6Pourthewetsoilintothemoldandfixitinthecompactoronthebottomplate.Forthe

specimensoftriaxialcompressiontest,dynamictriaxialtestandresonantcolumntest,they

shouldbecompactedinlayersbyspecimenheight.Dividethesiltinto3-5layers,andthe

cohesivesoilisdividedinto5-8layers.Fortheconsolidationtest,directsheartestand

permeabilitytest,thespecimenshouldnotbecompactedinlayers.Levelthetwoendsofthe

specimeninsamplecylinderandtakeitouttoweighitsmass.

Note:AccordingtothecurrentnationalstandardGB/T50145,StandardforEngineering

ClassificationofSoil,fine-grainedsoilreferstosuchwithagrainsizeoflessthan0.075mmaccountingfor

nolessthan50%.

4.2.4Specimenpreparationofdisturbedsandshallmeetthefollowingrequirements:

1Specimenpreparationoftriaxialcompressiontest,dynamictriaxialtest,andresonant

columntestshallbecarriedoutinstepsasfollows:

9

1)Sievethesoilspecimen.Whenthediameterofspecimenislessthanorequalto

100mm,themaximumallowablegrainsizeis1/10ofthediameter.Whenthe

diameterofspecimenisgreaterthan100mm,themaximumallowablegrainsizeis

1/5ofthediameter.

2)Weighandtaketherequiredamountofair-driedsandspecimenaccordingtothedry

densityandspecimenvolumeasrequiredbythetest,anddividesuchspecimeninto

threeequalparts.Boiltheminwater,andthencoolsuchforstandby.

3)Opentheporewaterpressurevalveandmeteringvalvetomakethebaseofpressure

chamberfilledwithwater.Slidetheboiledpermeableplateontothebaseof

pressurechamberandwrapitwithrubberbandtopreventsandfromleakinginto

thebase.Closetheporewaterpressurevalveandmeteringvalve,andputoneend

oftherubbermembraneonthebaseofthepressurechamberandtieittightly.Put

thesplitmoldonthebase,andturntheupperendoftherubbermembraneout.

Then,extracttheairtomaketherubbermembraneclosetotheinnerwallofsplit

mold.

4)Injectairlesswaterintotherubbermembranetoabout1/3ofthespecimenheight.

Putapieceofboiledandcooledsandspecimenintothemembranewitha

long-handledspoon,andfillittotherequiredheight.Forthespecimenwith

fine-grainedsoilandahighdrydensity,drysandmaybeusedforpreparation,and

waterheadsaturationorbackpressuresaturationmaybeadopted.

5)Uponthecompletionoffillingthefirstlayerofsandspecimen,continuetoinject

waterto2/3ofthespecimenheight,andthenfillthesecondlayerofsandspecimen.

Continuethefillingofspecimenuntilthemoldisfull.Whenthedrydensityis

requiredtobelarge,thesplitmoldmaybetappedgentlyinthefillingprocessto

maketheweighedsandspecimentobefilledatthespecifiedvolume.Theninstall

thepermeableplateandspecimencap,turnovertherubbermembrane,andtieiton

thespecimencap.

6)Openthemeteringvalvetolowerthemeteringpipesothatthewatersurfaceinthe

pipeisabout0.2mbelowtheelevationofthecenterofthespecimen.Whenthe

specimendiameteris101mm,itshallbeabout0.5mbelowtheelevationofthe

center.Acertainnegativepressureisgeneratedinthespecimentomakethe

specimenstandup.Removethesplitmoldtomeasuretheheightanddiameterof

specimen,andrecheckthedrydensity.

2Specimenpreparationforconsolidationtestanddirectsheartestshallbecarriedoutin

10

stepsasfollows:

1)Take1,200grepresentativeair-driedsandspecimenssievedby2mmsievefor

standby.Weightherequiredamountofair-driedsandforeachspecimenaccording

totherequireddrydensityinanaccuracyof0.1g.

2)Duringthedirectsheartest,aligntheupperandlowerboxes,andinsertthefixing

pin.Putthecleanpermeableorimpermeableplateintotheshearbox.

3)Pourthepreparedsandspecimenintothecuttingringofshearboxorconsolidation

container,andflattenthesurface.Putthehardwoodblockonthesurface,andgently

tapitwithhandstomakethespecimenreachtherequireddrydensity.

4.2.5Specimenpreparationforringsheartestshallmeetthefollowingrequirements:

1Soakthedisturbedsoilspecimensinpurewaterfor24h,distributethemuniformlyto

soilpasteinliquidlimitstate,andthenfillthemintothelimitring.

2Inthefillingprocess,fillaroundthelimitringfirstandthenthemiddlepart.Thegasin

thespecimenshallbeeliminated.

3Scrapethespecimentoptobeflushwiththeuppersurfaceofthespecimenbox.

4.2.6Specimenpreparationfortruetriaxialtestshallmeetthefollowingrequirements:

1Thespecimenshouldbeincuboidorcube,ofwhichthesixfaces(up,down,left,right,

frontandback)shallbeflat,andtheoppositefacesshallbeparalleltoeachotherandvertical

tothefaces.Theratioofspec