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1、PILERESPONSEDUETOEXCAVATION-INDUCEDLATERALSOILMOVEMENTByH.G.Poulos,'Fellow,ASCE,andL.T.Chen'ABSTRACT:Inthispaper,atwo-stageanalysisinvolvingthefinite-elementmethodandtheboundary-elementmethodisusedtostudypileresponseduetoexcavation-inducedlateralsoilmovements,w
2、ithspecificattentionbeingfocusedonbracedexcavationsinclaylayers.Influencesofvariousparametersonpileresponseareinvestigatedanddesignchartsforestimatingpilebendingmomentsanddeflectionsarepresented.Thesemaybeusedbypracticingengineerstoassessthebehaviorofexistingpi
3、lesduetotheexcavation.Theapplicationofthechartsisdemonstratedviaastudyoftwopublishedhistoricalcases.Comparisonsarepresentedbetweenmeasuredpilebehaviorandthatpredictedbothfromthechartsolutionsandthecomputeranalyses.Itisfoundthatthechartsolutionsmaybeextendedappr
4、oximatelytocoverothersoiltypes,butarenotapplicabletothecaseofunsupportedexcavations.INTRODUCTIONThereareseveralexampleswherepilefoundationshavebeenaffectedordamagedbyexcavation-inducedlateralsoilmovements,forexample,Finnoetal.(1991),Amirsoleymani(1991),andChu(1
5、994).Itisthusimportantforpracticingengineerstobeabletoestimatetheconstructionimpactonadjacentpilesbeforeand/orduringexcavation.Inprinciple,afinite-elementanalysismaybeusedtomakesuchanestimationandindeedthishasbeenshowntobeapowerfulmethod,forexample,asdemonstrat
6、edbyFinnoetal.(1991)andHaraetal.(1991).However,inmanycases,thereisalackofdetailedsiteorgeotechnicalinformation,andafinite-elementanalysisisneitherwarrantednorfeasible.Insuchcases,theuseofsoundlybased,butsimplified,designchartsmaybemoreappropriate,andthedevelopm
7、entofsuchchartsformstheprimarypurposeofthepresentstudy.Althoughanexcavationwillcausebothverticalandlateralsoilmovements,thelattercomponentisconsideredtobemorecriticalforadjacentpiles,especiallyconcretepiles,aspilesareoftennotdesignedtosustainsignificantlaterall
8、oadings.Therefore,inthepresentstudypilesareconsideredtobeaffectedonlybyexcavation-inducedlateralsoilmovements,andtheirresponseisanalyzedbythecombinationofafinite-elementmeth
