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1、PILERESPONSEDUETOEXCAVATION-INDUCEDLATERALSOILMOVEMENTByH.G.Poulos,'Fellow,ASCE,andL.T.Chen'ABSTRACT:Inthispaper,atwo-stageanalysisinvolvingthefinite-elementmethodandtheboundary-elementmethodisusedtostudypileresponseduetoexcavation-inducedlateralsoilmovements,withspeci
2、ficattentionbeingfocusedonbracedexcavationsinclaylayers.Influencesofvariousparametersonpileresponseareinvestigatedanddesignchartsforestimatingpilebendingmomentsanddeflectionsarepresented.Thesemaybeusedbypracticingengineerstoassessthebehaviorofexistingpilesduetotheexcav
3、ation.Theapplicationofthechartsisdemonstratedviaastudyoftwopublishedhistoricalcases.Comparisonsarepresentedbetweenmeasuredpilebehaviorandthatpredictedbothfromthechartsolutionsandthecomputeranalyses.Itisfoundthatthechartsolutionsmaybeextendedapproximatelytocoverothersoi
4、ltypes,butarenotapplicabletothecaseofunsupportedexcavations.INTRODUCTIONThereareseveralexampleswherepilefoundationshavebeenaffectedordamagedbyexcavation-inducedlateralsoilmovements,forexample,Finnoetal.(1991),Amirsoleymani(1991),andChu(1994).Itisthusimportantforpractic
5、ingengineerstobeabletoestimatetheconstructionimpactonadjacentpilesbeforeand/orduringexcavation.Inprinciple,afinite-elementanalysismaybeusedtomakesuchanestimationandindeedthishasbeenshowntobeapowerfulmethod,forexample,asdemonstratedbyFinnoetal.(1991)andHaraetal.(1991).H
6、owever,inmanycases,thereisalackofdetailedsiteorgeotechnicalinformation,andafinite-elementanalysisisneitherwarrantednorfeasible.Insuchcases,theuseofsoundlybased,butsimplified,designchartsmaybemoreappropriate,andthedevelopmentofsuchchartsformstheprimarypurposeofthepresen
7、tstudy.Althoughanexcavationwillcausebothverticalandlateralsoilmovements,thelattercomponentisconsideredtobemorecriticalforadjacentpiles,especiallyconcretepiles,aspilesareoftennotdesignedtosustainsignificantlateralloadings.Therefore,inthepresentstudypilesareconsideredtob
8、eaffectedonlybyexcavation-inducedlateralsoilmovements,andtheirresponseisanalyzedbythecombinationofafinite-elementmeth
