Page 197 - 《水资源与水工程学报》2023年第3期
P. 197

!34 " ! 3 #                       & ' ( ) & * + , -                               Vol.34No.3
               2023 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2023

            DOI:10.11705/j.issn.1672-643X.2023.03.24


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                 ABCDE:TU46   FGHIJ:A    FKLE:1672643X(2023)03019308
                          Calculationofinflowatthebottom ofexcavationpitwith
                              defectedsealingbarrieranditssensitivityanalysis


                                   DENGWei,SHIWenhao,WANGYuan,WUJinghong
                        (SchoolofCivilEngineering,SuzhouUniversityofScienceandTechnology,Suzhou215011,China)
                 Abstract:Theuseofthejetgroutedbottomsealingbarrierreinforcementatthebottomofthepitduring
                 excavationisanefficientmeasuretoreducetheimpactofgroundwaterseepageonthepit.Oncealocal
                 defectappearsinthebarrier ,groundwaterwillpourintothepit,whichwillobstructconstructionande
                 veninduceinrushaccidents,threateningconstructionsafety.Regardingtothisproblem,asimplifiednu
                 mericalmodelwasestablishedforthecalculationofseepageinflowatthebottomofarectangularpitwith
                 adefectedsealingbarrier ,bywhichtheformulaforcalculatingtheseepageinflowwasderived.Then,
                 GeoStudiowasadoptedtosimulatetheseepagefieldofthebarrierwithalocaldefect,andtheresults
                 werecomparedwiththoseofthepreviousderivedformula,soastodiscusstheapplicableconditionsof
                 theformula.Theresultsshowthatthedefectimpermeabilitycoefficient δ (theratioofthepermeabilityco
                 efficientoftheundisturbedsoiltothatofthedefectinthebarrier)isthemainfactoraffectingtheaccura
                 cyoftheformula ,andtherelativeerrorbetweenthecalculatedandsimulatedvaluestendstodecrease
                 withtheincreaseof δ ,whenδ≥20,thecalculatedvalueisconsistentwiththesimulatedvalue,the
                 differenceinwaterheadatthebottomoftheseepagebarrierhasasmalleffectontheamountofseepage ;
                 when δ<20,therelativeerrorbetweenthecalculatedandsimulatedvaluesislarge,ahalftheoretical,
                 halfempiricalequationobtainedbycorrectingthetheoreticalequationempiricallycanbetterreducethe
                 errorinthecalculationofseepagevolumecausedbythedifferenceinwaterheadatthebottomoftheseal
                 ingbarrier.Theresultsofthestudyhaveacertainreferentialvalueforthecalculationoftheinflowatthe
                 bottomofthepitandtheanalysisofbarrierquality.

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                {|+,: IOÑ(1988—), ?, +,KÝB, CD, :I, JKLMÆüZ[Š%NWMq´²z%SZs。
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