《海上风电场工程岩土试验规程》（NB／T 10107-2018）英文版

ICS27.180

P61

RecordNumber:J2649-2019NB

ENERGYSECTORSTANDARD

OFTHEPEOPLE’SREPUBLICOFCHINA

中华人民共和国能源行业标准

PNB/T10107-2018

SpecificationforGeotechnicalTestsofOffshore

WindPowerProjects

海上风电场工程岩土试验规程

（征求意见稿）

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:

翻译出版说明

本译本为国家能源局委托水电水利规划设计总院按照有关程序和规定，统一组织翻

译的能源行业标准英文版系列译本之一。2018年12月25日，国家能源局以2018年第

16号公告予以公布。

本译本是根据中国水利水电出版社出版的《海上风电场工程岩土试验规程》NB/T

10107-2018翻译的，著作权归国家能源局所有。在使用过程中，如出现异议，以中文版

为准。

本译本再翻译和审核过程中，本标准编制单位及编制组有关成员给予了积极协助。

为不断提高本译本的质量，欢迎使用者提出意见和建议，并反馈给水电水利规划设

计总院。

地址：北京市西城区六铺炕北小街2号

邮编：100120

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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