工程建设标准强制性条文CPECSB4房屋建筑部分英文版Word格式文档下载.docx

工程建设标准强制性条文CPECSB4房屋建筑部分英文版Word格式文档下载.docx

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SurveySpecificationforRockandSoilEngineeringGB50021-94

1.1.12Detailedsurveyshallprovideddetaileddocumentsforrockengineeringandtechnicalparametersofrocksfordesignuseinthelightofdifferentarchitecturesorarchitecturegroups.Itshallalsoprovideanalysisandevaluationforrockengineeringofarchitecturefoundationsandtheprovingofspecificplansoffoundationdesign,foundationtreatmentandthepreventionandtreatmentofbadgeologicalphenomenonaswell.Followingsaremainworkstobedone:

（1）Toobtaingenerallayoutplanofarchitecturewithcoordinatesandterrain,thecleanedgroundlevelofarchitectures,thenature,scaleandstructuralfeaturesofthearchitecture,thepossibletypeandsizeoffoundation,theestimateddepthoffoundationandthespecialrequirementsforfoundationdesignetc.

（2）Toclarifytheorigin,type,distributionrange,developmenttrendandextentofhazardsofbadgeologicalphenomenonandtoprovideevaluationandtechnicalparametersofrocksforthetreatment.

（3）Toclarifythetype,structure,thickness,slopeandengineeringfeaturesofeachlayerofsoilwithintheareaofthearchitecture,calculateandevaluatethestabilityandbearingforceofthefoundation.

（4）Forarchitecturesneedcalculationforsettlement,toprovideparametersforcalculationoffoundationdeformation.

（5）Forlocationswheretheseismicintensityexceedsorequalsto6magnitude,thecategoryofgroundsoilandthecategoryofgroundshallbeclassified.Forlocationswheretheseismicintensityexceedsorequalsto7magnitude,theearthquakeliquefactionofsaturatedsandsoilandsaturatedpowdersoilshallbejudgedandtheindexofliquefactionshallbecalculated.

（6）Toclarifytheconcealmentconditionsforundergroundwater.Whenmakingdesignforloweringwaterforfoundationpits,itisalsonecessarytoclarifytheamplitudeandregularityofwaterlevelchangingandtoprovideinformationofstratumpenetration.

（7）Tomakejudgementofthecorrosiontoconstructionmaterialsandmetalsbyenvironmentalwaterandsoil.

（8）Tomakejudgementofpossibilityoffluctuationoffoundationsoilandundergroundwaterinconstructionperiodandinserviceperiodandtheirinfluencetotheproject,alsosuggestthemeasuresfortreatment.

（9）Forexcavationofdeepfoundationpits,itisnecessarytoprovidetechnicalparametersregardingrockandsoilrequiredformakingstablecalculationandforthedesignofsupports.Proveandevaluatetheinfluenceoffoundationexcavationandwaterloweringtoneighboringprojects.

（10）Toprovidetechnicalparametersregardingrockandsoilforthedesignoffoundationpilesandtodeterminetheloadforsinglepile.

1.1.15Thedepthofboreholeindetailedsurveyshallbecalculatedfromthebottomoffoundationanditsvalueshallmeetfollowingregulations:

（1）Forthefoundationcalculatedaccordingtotheload,thedepthofboreholeshallcontroltheforce-bearinglayerofthefoundation.Whenthebottomwidthofthefoundation,b,isnotmorethan5m,thedepthoftheboreholeshallbethreetimesthewidthofthebottomofstripfoundationwhileforisolatedfoundation,itshallbe1.5times.However,itshallnotbelessthan5m.

（2）Forfoundationsneededtocheckcomputationsofdeformations,thedepthofcontrolboreholeshallexceedthedepthofsettlementoffoundation.

（3）Incasethereislargeareaofstockpileloadonthegroundorthereissoftsubbaselayer,thedepthofboreholeshallbeincreased.

1.1.16Thesamplingandtestingfordetailedsurveyshallmeetfollowingregulations:

（1）Thenumberoftaking-soilsamplesandthenumberforholes（wells）oftestingatoriginalpositionshallbedeterminedaccordingtotheevennessanddesignrequirementsofthefoundation.ForbuildingsofClass1safetyclassification,itshallnotbelessthanthreeperbuilding.

（2）ForeachlocationoreachbuildingofClass1safetyclassification,thesamplesoforiginalsoilofeachmainlayershallnotbelessthan6.Thetestingdataatoriginalpositionintheholeofsamesoillayershallnotbelessthan6groups.

（3）Inmajorforce-holdinglayeroftheground,taking-soilsamplesororiginalpositiontestinginboresshallbemadeforthesandwichlayerorlenslayerwiththicknessover50cm.

1.1.17Constructionsurveyshallbemadeinassociationwithdesignorganizationandcontractorinoneoffollowingcases:

（1）ForbuildingsofClass1orClass2safetyclassification,inspectionofconstructionoffoundationpitsshallbemade.

（2）Afterexcavationoffoundationpits,incasetheconditionsofrockandsoilarenotinconformitywithoriginalsurveyinformation,constructionsurveyshallbemade.

（3）Ifcavesorearthholesingroundaredeveloped,theyshallbeclarifiedandsuggestionfortreatmentshallbeputforward.

（4）Ifinconstructionthereisdangerofinstabilityofedgeslope,itshallbeclarifiedandmonitored.

1.1.18Thearrangementofexploringpointsindetailedsurveyforhigh-storybuildingsshallmeetfollowingrequirements:

（1）Exploringpointsshallbearrangedalongtheperimetersofthebuilding.Cornersandintermediatepointshallalsohaveexploringpoints.

（2）Thearrangementofexploringpointsshallmeettherequirementsforevaluationofstratumstructureandevennessbothfromradialandlongitudinaldirections.

（3）Forbuildingswithspecialshape,theexplorationpointsshallbearrangedaccordingtothespecialshape.

（4）Thenumberofexploringpointforsinglehigh-storybuildingshallnotbelessthanfour.

3.7.2Thesurveyforexcavationoffoundationpitsandforsupportingengineeringshallmeetfollowingrequirements:

（1）Atinitialstageofsurveyforproposedmainbuilding,thefeasibilityofsupportingshallbepreliminarilydeterminedaccordingtorockandsoilengineeringconditions.Atstageofdetailedsurvey,specialsurveyshallbemadetotheprojectsneedtosupport.

（2）Therangeofsurveyshallbedeterminedaccordingtothedepthofexcavationandtherockandsoilengineeringconditionofthatlocation.Exploringpointsshouldbearrangedoutsideoftheboundaryofexcavationandtothedepthof1~2timesexcavationdepth.Forsoftsoil,thescopeofsurveyshallbeextendedappropriately.Thedepthofexploringpointsshallmeettherequirementsforcheckingatdifferentlimitconditions.

（3）Effectivestressstrengthparameterofsoilortheparameteroranti-shearstrengthwithoutdrainingwatershallbeputforwardaccordingtothestructureofstratumandthenatureofrock.Andsoil.Theinfluencetothesoilbychangesinstresscausedbyconstruction,thechangesinconditionsofstrainandtheundergroundwatershallbeevaluated.

（4）Thefeaturesofundergroundwaterwithintheareaofexcavationandnearbylocationsshallbeclarified.Itisalsoneededtoclarifytheinfluencetonearbybuildingsandfacilitiesbychangesinwaterlevelinconstruction.Theestimationofthepossibilityofhigherpermeationandpipesurgingshallbemade.Measuresforloweringwaterorisolatingwaterinconstructionshallbesuggested.

（5）Theexistingstatusandcharacteristicsofnearbybuildingsandfacilitiesandtheirbearingcapabilityforvibrationandtheirdisplacementcausedbyconstructionshallalsobecheckedandclarified.

1.8.1Surveyforrockandsoilengineeringofpilesormoundsshallincludefollowings:

（1）Toclarifyconcealmentconditionofrockandsoilandtheirphysicalandmechanicalfeatures,theconcealmentdepth,thickness,propertyandtheirchangesofforce-bearinglayerandsoftsubbaselayer.

（2）Whengroundrockisusedasfoundationforce-bearinglayer,itisnecessarytoclarifythestructure,property,extentofweatheringandthethicknessofthegroundrock.

（3）Thehydro-geologicalconditionsandthecorrosionstopileandmoundmaterialcausedbyundergroundwatershallbeclarified.

（4）Toevaluatethefeasibilityofsinking-pile.Toprovetheconstructionconditionsforpileormoundandtheirinfluencetotheenvironment.

6.2.2Inrockandsoilengineeringsurvey,ifthereisstratum,whichcontainswater,undergroundwaterlevelshallbemeasured.

8.2.4Exploratoryboringshallmeetfollowingregulations:

（1）Therecoverydrillingdepthofnon-continuouscore-takingdrillingshallbelessthan1mforspiralexploratoryboring,whileforrockcoreboring,itshallbelessthan2m.

（2）Fortheboringtoverifynaturalhumidityofstratum,itshallbedrilledinadrywayabovethelevelofundergroundwater.Whenitisnecessarytodrillwithaddedwaterorwithcirculationliquid,itshallusedouble-layerrockcorepipefordrilling.

（3）Therockcoresamplingrateinrockcoreboringshallnotbelessthan80%forgeneralrockandnotlessthan65%forbrokenrock.

（4）Forfix-directiondrilledbores,theinclinationoftheboreshallbemeasuredsectionbysection.Theprecisionofmeasurementforinclinationangleandorientationshallberespectively±

0.1°

±

3.0°

.

8.2.5Recordsforfieldboringshallbemadebypersonnelspeciallytrained.Therecordsshallbetrueandmadetimelyandpreparedaspereachsection.Itisstrictlyprohibitedtowriteafterwards.

SpecificationforEngineeringGeologicalSurveyofSoftSoilAreaJGJ83-91

6.2.1Forthesurveyoffoundationpitsinsoftsoilarea,careshallbetakenintheexcavationareatothedisplacementofearthcausedbychangesinstressfieldofearthandduetothenatureoffluidofsoftsoil.Relevantmeasuresandparametersforthebadphenomenonsuchasreboundoffoundationbottomsoil,sidedisplacementandsettlementofsoilbodyinslopeshall