Page 172 - 《水资源与水工程学报》2023年第1期
P. 172

!34 " ! 1 #                       & ' ( ) & * + , -                               Vol.34No.1
               2023 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2023

            DOI:10.11705/j.issn.1672-643X.2023.01.20


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                 FGHIJ:TU43;TV16   KLMNO:A    KPQJ:1672643X(2023)01016808

                           Activeearthpressuremodelunderadjacentfoundation
                                       pitexcavationandseepagecondition

                                                          2
                                           1
                                                                                      2
                                                                       1
                                  LIJingpei,SHIShudong,ZHENGLi,YAOJianping
                                (1.CollegeofCivilEngineering,TongjiUniversity,Shanghai200092,China;
                                2.ShanghaiNanhuiConstructionGroupCo.,Ltd.,Shanghai201399,China)
                 Abstract:Theexcavationofadjacentfoundationpitandthechangeofsiteseepageconditionswillaffect
                 theearthpressureonthesupportingstructureofthefoundationpitconstructedpreviously ,whichinturn
                 causesstructuraldeformation.However ,therearefewearthpressurecalculationmodelswhichconsider
                 theabovetwoaspectsatthesametime.Basedonthelimitequilibriummethodandthegeometricrelation
                 shipbetweentheadjacentexcavationboundaryandthelogarithmicspiralslidingsurface,thecalculation
                 theoryoftheeffectiveweightofsoilandthechangeofsuctionwiththeseepageconditionofthesiteisin
                 troducedtoestablishacalculationmodelofactiveearthpressureconsideringtheadjacentpitexcavation
                 andseepagecondition.Thenthemodelisverifiedtobelogicalandreliablebythemonitoringdata.Pa
                 rameteranalysisshowsthatwhentheadjacentpitdepthisconstant ,theactiveearthpressurecoefficient
                 firstchangeslinearlywiththeincreaseofpitspacing,thenincreasesanddecreases,andfinallystabili
                 zes.Whenthepitspacingisconstant ,withtheincreaseoftheadjacentpitdepththeactiveearthpres
                 surecoefficientpresentstwotypesofchanges ,oneisthe“hillsidetype”,whichrisesfirstandthende
                 clines;theotherremainsunchangedafterrising.Therainfallseepageandtheriseofgroundwaterlevel
                 willreducethesuctionstressinsoilandleadtotheincreaseofactiveearthpressure.Theresearchresults
                 canprovideatheoreticalreferenceforthestressanddeformationanalysisofthefoundationpitaffectedby
                 theadjacentpitexcavation.
                 Keywords:adjacentfoundationpit;activeearthpressure;foundationpitspacing;limitanalysis;site
                 seepage
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