加筋土挡墙的设计程序开发及应用06823[鞠]

1TheDesignforReinforcedEarthRetainingWallandtheExploitationandApplicationofitsSystemProgramAbstract:Basedonthebasicprincipleandmethodofthecalculationforreinforcedearthretainingwallandtheearthpressurecoefficient,theprocessoftheprojectandcalculationisrealizedbythelanguageofFORTRANinthecomputer,andthesystemprogramisusedinaslopetreatmentprojectinGuangzhou.Comparingwiththedesignmethodofthetraditionalregulations,itisshowedthattheoptimumlengthrequiredisobtained,thecrosssectionandlengthofbarsarefullyused,andthedesignissimplified.Keywords:ReinforcedearthretainingwallProjectandcalculationComputersystemprogramPracticalapplication1.IntroductionReinforcedearthretainingwalliscompositestructurecomposedofbackfill,reinforcingbarsandwallpanel.Frictionbetweensoilandbarsenhancesthereinforcedearthretainingwallstrength,improvesitsphysicalbehaviorandreinforcessoilcohesion.[1]Basedonthespecification,systemprogramisexploitedtoapplyreinforcedearthretainingwalldesignbythelanguageofFORTRANinthecomputer.Therelationshipbetweenphysicalbehaviorandcrosssectionsofbars,lengthandlayerofbarsisconsideredbysynthesis.Notonlycrosssectionsandlengthofbarsarefullyusedandoptimized,buttheexternalstabilityofretainingwallisreinforcedaccordingly.Thequestionsofthetraditionaldesignmethodareavoided.Inthetraditionalregulation,firstly,thewallsectionisassumed;secondly,thereinforcementofbarsarecalculated,thecrosssectionandlengthofbarsaregained.Inthisway,thehaul-resistantcoefficientofthetopwallisnotenough,butitgoesbeyondatthebottomofretainingwall.Thequantityofusedbarsisexcessive.2.[1,2]Designforreinforcedearthretainingwall2.1Basicassumption(1)Theinterfacebetweenactivityareaandstabilityareainthereinforcedbodyissimplifiedfailureplane(Fig.1).TheheightofactivityareaisH1,thatofstabilityareaisH2,bHisthedistancebetweenverticalfailureplaneandinsidewallplane.Φistheangleofinternalfriction.SimplifiedfailureplanebH=0.3H=45°+/2Fig.1SimplifiedfailureplaneH2H1stabilityareaactivityareaFig.2EarthpressurecoefficientdistributionHKiK0′KaZi(2)Lateralearthpressurecoefficient[3]Lateralearthpressurecoefficientvarieslineallyfromactivelateralpressurecoefficienttoat-restlateralpressurecoefficient(Fig.2).２.２Externalforcecalculation2.2.1LateralearthpressurecalculationEiistheactivelateralpressuretowhichthestructureissubjected.2hzKKEiiiii11(2.1)Where,σiistheverticalpressureforthedepthzibelowtheground;r1isthebulkunitweightofbackfill(kN/m3),r1belowthewateristheeffectiveunitweight;hissoilthicknessinducedbytheloadontheground.2.2.2Reinforcingsteelbarscalculation(1)ReinforcementofbarsyxiiyxiiSShzKSSET11（2.2）Where,Tiisthetensionforbarbeltelement;Sxisthehorizontalspaceforbarbeltnodes;Syistheverticalspaceforbarbeltnodes.(2)BarcrosssectionLyxiiLiKSShzKKTA3131010（2.3）Where,Aisdesigncrosssectionareaforbarbeltelement;[σL]istheallowablestressforbar;Kistheallowablestressincreasingfactor.(3)BarbeltlengthcalculationThedesignlengthLiofreinforcedmaterialincludesanchoringlengthL1iandactivelengthL2i,thatis,Li=L1i+L2i(2.4)iiifizbfTKL112(2.5)If10Hz,HibL2(2.6)InthecaseofHzH1,)2/45tan(2iizHL(2.7)Where,biisthetotalwidthofbarbeltelement;f′isthefrictionbetweenbarbeltandbackfill,[Kf]isthehaul-resistantstabilitycoefficient.２.３Reinforcedmaterialstabilitycheckingcomputation2.3.1InternalstabilitycheckingcomputationThehaul-resistantcheckingcomputationforreinforcedmaterialshouldsatisfythefrictionalresistantalongtheactivelengthisbiggerthanthetensionforbarbeltelement.2.3.2ExternalstabilitycheckingcomputationExternalstabilitycheckingcomputationforreinforcedearthretainingwallincludewholestabilityanalysis,stabilitycalculationagainstslidingandoverturning,contactpressurecalculationandsettlementcalculation,etc.3.ReinforcedearthretainingwallsystemprogramexploitationSystemprogramexploitationisrealizedbythelanguageofFORTRANinthecomputer(seeFig.3).Therelationshipbetweenphysicalbehaviorandcrosssectionsofbars,lengthandlayerofbarsisconsideredbysynthesis.Assumedbarcrosssectionareaandlengthofilayer,barcrosssectionareaandlengthofi+1layercanbeinducedbyevaluationandoverlapping.Twomethodsareinvolvedinthestabilitycheckingcomputation:SARMAmethodandspecificationmethod.Whenbothmethodsaresatisfied,barcrosssectionareasandlengthsaredesired.Therefore,thecharacterofthissystemprogramisthatsectionandlength(trapeziuminversion)ofeachbarbeltarecertainundertheconditionofsatisfyingstabilitycheckingcomputation.However,thecharacteroftraditionaldesignmethodisthatsectionandlength(rectangleortrapezium)ofeachbarbeltareassumedbeforestabilitycheckingcomputation.BasedonSARMAmethoddesignedbySarma,Thesystemprogramisexploited.Searchofpotentialslipplaneistakenintoaccountintheprogram.Iftwocoordinates(acoordinateandan3angle)ofslipplaneareinput,themostdangerousslipplanecanbesearched.Atthesametime,theeffectofwaterpressureisconsideredduringthecalculation.ThecredibilityofreinforcedearthwalldesignisheightenedbecauseofusingSARMAmethodandspecificationmethod.noyesFig.3Systemprogramforreinforcedearthretainingwalldesign４.ProjectexampleFig.4giv