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CFG桩处治软土路基的沉降预测.docx

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CFG桩处治软土路基的沉降预测 Title:PredictionofSettlementinSoftSoilRoadbedTreatedwithCFGPiles Introduction: Softsoilconditionsposesignificantchallengesforroadconstructionduetotheirlowbearingcapacityandhighcompressibility.Traditionalsoilimprovementtechniquesoftenfallshortinachievingadequatestabilityforroadinfrastructure.Toovercomethesechallenges,apopularmethodistheuseofCementFlyAshGravel(CFG)pilesasagroundimprovementtechnique.CFGpilesarecreatedbymixingcement,flyash,andgravelandarecommonlyusedtostrengthensoftsoilsediments.ThispaperaimstodiscussthepredictionofsettlementinsoftsoilroadbedstreatedwithCFGpiles. 1.OverviewofSoftSoilRoadbeds: 1.1CharacteristicsofSoftSoil: -Lowbearingcapacity -Highcompressibility -Highwatercontent -Highorganiccontent -Lowshearstrength 1.2ChallengesinSoftSoilRoadConstruction: -Excessivesettlements -Differentialsettlementsleadingtounevenroadsurface -Lossofstability -Increasedmaintenancecosts 2.GroundImprovementTechniques: 2.1TraditionalTechniques: -Excavationandreplacement -Preloadingandsurcharging -Verticaldrains 2.2OverviewofCFGPilesTechnique: -CompositionofCFGpiles -AdvantagesofCFGpilesovertraditionaltechniques: -Fasterconstructiontime -Cost-effectiveness -Reducedsettlements 3.SettlementPredictioninSoftSoilRoadbeds: 3.1FactorsInfluencingSettlement: -Soilproperties(density,watercontent,shearstrength) -Loadmagnitudeanddistribution -Pilearrangementandspacing -Constructionmethod 3.2AnalyticalMethodsforSettlementPrediction: -Elastictheory -Consolidationtheory -Finiteelementanalysis(FEA) -Numericalmodeling(PLAXIS) 4.CaseStudies: 4.1OverviewofCaseStudies: -BriefdescriptionofsoftsoilroadprojectstreatedwithCFGpiles -Selectioncriteriaforcasestudies 4.2PredictionandComparisonofSettlement: -Applicationofanalyticalmethods -SettlementpredictionsbeforeandafterCFGpileinstallation -Comparisonwithactualsettlementobservations 5.DiscussionandRecommendations: 5.1EvaluationofSettlementPredictionMethods: -Comparisonofanalyticalmethods -Advantagesandlimitationsofeachmethod 5.2F