高低应变检测报告Word格式.docx
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高低应变检测报告Word格式.docx
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InvestigationCompany
DesignCompany
ConstructionCompany
TestingCompany
TheMaintestingTechnicistand
CertificateNo.
Compiledby
Checkedby
Reviewby
Approvedby
Explanation
TestingCompanyAddress
Postalcode
TableofContent
1.ProjectSummery
Theproposedbuilding(structure)divideintoWorkingAreaandEquipmentArea.Workingareamainlyinclude:
FireEmergencyCenter,AdministrationBuilding,DinningRoom,PrayerRoometc.;
Equipmentareamainlyinclude:
MainSubstation,Stream&
GeneratingSet,IntegratedPumpingstation,WasteDisposalPlant,CoolingWaterUnit,PackingHouse,Torch,SyntheticAmmoniaInstallation,AmmoniaTank,UreaPlant,UreaBaggedWarehouse,BulkUreaWarehouseetc.Majorbuilding(structure)showninthetablebelow:
ProjectName
Outdoorgrounddesignedlevation
(m)
Structuretype
FoundationTypes
Characteristicvalue
ofsubgradebearing(kN/m2)
FireemergencyCenter
19.3
ReinforcedConcreteFrame
Independentcolumnbaseorpile
180
AmmoniaTank
19.7
LocalSteelFrame
Raftorpiles&
raft
200
Torch
21.6
SteelFrame
raft
180~200
UreaPlant
PackingHouse
20.3
BulkUreaWarehouse
20
SteelPortalFrame(Steel)
Independentcolumnbaseorpile
UreaBaggedWarehouse
CentralControlBuilding
19.5
CoolingWaterUnit
19.4
SteelFramewithtowerpoolbelow
Sewage-treatmentUnit
17.5
NaturalGasMeteringStation
MainSubstation
SyntheticAmmoniaInstallationSubstation
UreaPlantDistributionRoom
IntegratedWarehouse
19.0
LaboratoryTechnicalBuilding
ChemicalWarehouse
AdministrationBuilding
DinningRooms
Reinforcedconcretestructure
GuardHouse
18.5
150
Demiwatersystemgeneral
A2districtAirCompressorbuilding
Frame-bent
D1districtCombinationCompressorbuilding
Thedetectionoftheproject,usingboredpilefoundation,andtechnologyoflongspiraldrilled,thetotalnumberofpileis12,length18.9m,effectivelength18.1m,diameter500mm,single-pileverticalbearingcapacitycharacteristicvalueof1000kN,concreteclassC30.
OurCompanyundertaketheEngineeringFoundationpiledetectiontasks,useHigh-StrainDynamic(Drop-Weight)Testingmethodtodetecttheverticalbearingcapacityofasinglepilewhichdetectionnumberis5,andusethelow-strainmethodtodetectthepileintegrity,theamountofwhichis10.ThetestingworkbeganonJanuary18,2014,completedonJanuary18,2014.
Accordingtodrillingreport,thestratumconsistsofplainandmiscellaneousfill,Silt,Siltyclay,clayetc.,describedasbelow:
Layer0,Miscellaneousfill:
variedness,mainlycomposedofconstructionwaste.JustNo.JT2poreisdistributedatpreliminaryprospecting.
Layer0A,Plainfill:
brickredwithgray,mainlysiltysand,mixedwithalittlesilt.JustNo.140and144porearedistributed.
Layer1A0,Siltyclay:
frombrickredtoyellowish-brownwithgray,mixedwithalittlesiltysand.Softplastic.Highcompressibility.Localdistribution.
Layer1A1-1,siltysand:
brownwithgray,mixedwithalittlesiltandaverysmallamountofclay.Fromverywedtosaturation,loose.Highcompressibility.Scattereddistribution.
Layer1A1,siltysand:
frombrickredtobrown-yellowishwithgray,mixedwithalittlesiltandaverysmallamountofclay.Fromverywedtosaturation,fromloosetoslightlydense.Highcompressibility.Localdistribution.
Layer1A,Siltyclay:
gray,yellowish-brown,withalittlesiltysand.Plastic.Mediumplastic.Widelydistributed.
Layer1A2,silt:
fromyellowish-browntobrickred,mixedwithalittleclay.Mediumdense,fromwedtoverywed.Mediumcompressibility.Scattereddistribution.
Layer2A0,silt:
fromyellowish-browntobrownwithgray,mixedwithalittleofclay.Frommediumtodense,fromwedtoverywed.Mediumcompressibility.Localdistribution.
Layer2A,Siltyclay:
fromyellowish-browntobrickred,mixedwithalittleofclaysilt.Fromemediumplastictohardplastic.Mediumcompressibility.Localdistribution.
Layer2A1,siltysand:
lightbrownandyellowish-brownwithgray,mixedwithalittleofclaysilt.Mediumdense,saturation.Mediumcompressibility.Widelydistributed.
Layer3A,siltysand:
gray,yellowish-brown,mixedwithalittleofclaymiddle-fine-sandandsilt.Dense,saturation.Mediumbiasedtowardhighcompressibility.Widelydistributed.
Layer3B,siltysand:
gray,yellowish-brown,containingmica,mixedwithalittleofclaymiddle-fine-sandandsilt.dense,saturation.Mediumbiasedtowardhighcompressibility.Widelydistributed.
Layer3B1,Siltyclay:
fromlightbrowntoblue-gray,mixedwithalittleofclaymiddle-fine-sand.hardplastic.Mediumcompressibility.Scattereddistribution.
Layer3C,siltysand:
fromgraytoyellowish-brown,containingmica,mixedwithalittleofclaymiddle-fine-sandandsilt.Dense,saturation.Lowcompressibility.Widelydistributed.
Layer3D,siltysand:
fromgraytoyellowish-brown,containingmica,mixedwithalittleofclaymiddle-fine-sandandsilt.Fromslightlydensetomediumdense,saturation.JustNo.JT1porearedistributedatpreliminaryprospecting.Mediumcompressibility.
Thephysicalandmechanicalpropertiesofaquifersisprovidedbythedetailedsurveyreportaccordingto”ProjectGeotechnicalInvestigationReport”.
2.PrinciplesandMethodsofTesting
2.1Low-StrainPileIntegrityTesting
TheSonic-Echotestisperformedbystrikingthepileheadwithalighthammerandmeasuringtheresponseofthepilewithasensor(accelerometerorgeophonevelocitytransducer)coupledtothepilehead.Thehammerblowgeneratesacompressivestresswavewhichischanneleddownthepileshaftasa‘bar-wave’.Thelatterispartlyreflectedbacktowardsthepileheadbyanychangeinimpedancewithinthepile.Theseimpedancechangescanbeasaresultofchangesinpilesection,concretedensityorshaft-soilproperties.Thestresswaveistransmittedthroughthepileatvelocity,Vb(whereVbisthebar-wavevelocityofpropagationthroughthepilematerial)andthetimelapse,t,betweenthehammerimpulseandthearrivalofthereflectedwavesatthepileheadfrompiletipisameasureofthedistancetraveledbythestresswave,suchthat:
t=2L/Vb
whereLrepresentsthedistancetothereflectingsurface(piletipinthiscase).IfthevalueofVb,isknown,orcanbeestimatedwithinreasonablelimits,thenwillgiveanestimateofthepilelengthorthedepthtoanyotherreflectingsurfacewithinthepile.Ifthepilelengthisknown,thenacomparisoncanhemadebetween(helengthcalculatedfromthetestresultandtheknownlength,inordertoverifythatthedepthtothereflectingsurfaceiscorrect
2.2HighStrainDynamic(Drop-Weight)Testing
Placeaweightanddecouplingdeviceoverthepilehead.Releasingthedecouplingintheexperiment,theweightfallfreeandimpactthepilehead,generatedstresswavespreaddownalongthepile.causeofthesoilresistancestresswaveisreflectedbacktothepilehead,andchangethemotionspeedofparticleofthepile.Usingthestrainandaccelerationsensorsatadistanceof1.5to2timesofthepilediameterrecordtheaccelerationandstresswaveofpilewhentheweightfallfree.Usingpileanalyzercurvefittingcalculatethebearingcapacitythatisequivalenttothebearingcapacityunderstaticloadbasedonthemeasuredcurvebelow:
Assumethepileandthesoilmechanicsmodelandmodelparametersofeachunit,usingthemeasurementofvelocityorforcecurveastheinputboundaryconditions,Numericallysolvingwaveequation,Inversetheforceorvelocitycurveofthepilehead.Ifthecalculatedcurvesdoesn'
tmatchthemeasuredcurve,itmeansthatthemodelandthemeasuredcurveisnotreasonable,targetedtoadjustthemodelandparametersandthencalculated,Untilthecalculatedcurveandthemeasuredcurveismatchandcannotbeimproveeasily.Atthistime,theassumptionmodelandparameterscansimulatethestaticloadtests,accordingtothesimulationofstaticloadtest,thebearingcapacityofthepilecanbeanalysisandcalculated.
3.Equipment
ThedevicesusedinhighstrainandlowstraindynamictestingareRS-1616K(S)-typepiledynamictestinginstrumentanditssensors,strainringsandotheraccessoriesproducedbyChinaEngineeringTechnologyCo.,Ltd.,Wuhan,andthesedeviceshaveacquiredthenationaltypeapprovalofmeasuringinstruments(CPA:
StateBure
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