Howtogetthereasonablevalueofbearingcapacityoffoundation1.IntroductionWiththerapiddevelopmentofcityconstruction,citylandincreasinglytense,whetheronthegroundorundergroundspacearerequiredtomaximizetheuseoflarge,complexshape,theupperloadsizedisparityofbuildingshaveconstantlyappeared,easilyleadtotheunevenfoundationdeformation.Theresultsoftheinvestigationshallbeapplieddirectlytotheconstructionproject,inordertofacilitatetheunderstandingandtherationaluseofspecification,weonengineeringsurveyinformationindeterminingthebearingcapacityandthevalueswerediscussedandputforwardthetreatmentprinciple.2．CharacteristicvalueofsubgradebearingcapacitydeterminationThebearingcapacityofthefoundationforthefoundationdesigniscrucial,"codefordesignofbuildingfoundation(GB50007-2002)"cancelled"codefordesignofbuildingfoundation."[GBJ7-89]aboutbearingcapacitytablearticlesandappendix.Butinthepracticalworksomeindustriesandlocalcodes,regulationsalsoretainsthebearingcapacityofthefoundationofexperienceandexperienceformulatable.Withthelargenumberofcomplexarchitecture,thebuilding'supperloadoftendifferenceisbigger,easytocausetheunevenfoundationdeformation,designisneededwhenusingavarietyofgroundandfoundationtypeorconsidertheuseofsubgradeandfoundationandsuperstructureofdeformationcalculation,solvetheunevensettlementoffoundationandupperstructureeffectsoftheproblem,notsimpleaccordingtodatastatisticvalue,look-uptabletodeterminethebearingcapacityofthefoundation.Therefore,determinationofbearingcharacteristicvalue,thereasonableselectionofengineeringcharacteristicsofrepresentativevalueatthesametime,shouldbefullytakenintoaccounttheeffectofgeologicalenvironmentontheground.Forexample,avenueofthetwoengineeringdistanceofabout20meters,belongtothesameengineeringgeologicalunit,thewatercontentofsoilindex,voidratio,compressionmodulusdifference,project1,project2maincompressionlayersptthemeasuredaveragevalueNwere22hits,butthecharacteristicvalueofsubgradebearingcapacityforFA220kPa,160kPa.Fromtheaboveresultscanbeobtainedindeterminingthebearingcapacitycharacteristicvalue,selecttheengineeringcharacteristicstestingforthevalue,theselectionprincipleisdifferent,project1selectthestandardvaluesfortherepresentativevalueengineering2,slightlyhigherthantheminimumvalueofselectedasrepresentativeofvalue.Evidentinthesameengineeringgeologicalunitselectionofrepresentativevalueofdifferentengineeringproperties,todeterminethebearingcapacitycharacteristicvalueisrelativelylarge,sothescientificandreasonableselectionofengineeringcharacteristicsofrepresentativevalueistodeterminethecharacteristicvalueofsubgradebearingcapacityinthekey.Fromthegeologicalenvironmentonthefoundation'sinfluence,isalsooneofthekeyfactors.Forexamplefromtheundergroundwaterlevelimpactanalysis,theengineeringofgeomorphicunitsoftheYellowRiveralluvialIterrace,5metershighriverterrace.Bearinglayersofsand,groundwaterdepthis2meters,thegroundwaterofQuaternaryporewater,groundwaterfluctuationandatmosphericprecipitationandtheYellowRiverhaveclosehydraulicconnection.Determinationofbearinglayercharacteristicvalueofsubgradebearingcapacitytofullyconsidertheburieddepthofgroundwatertableandwaterlevelvariationfactors.Throughthewaterlevelandwaterlevelabovetwogroupsofplateloadingtestresultstodeterminethecharacteristicvalueofsubgradebearingcapacitywere280kPa,460kPa.Engineeringpracticeshowsthattheengineeringprop...
