Page 182 - 《水资源与水工程学报》2022年第1期
P. 182

!33 " ! 1 #                       & ' ( ) & * + , -                               Vol.33No.1
               2022 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2022

            DOI:10.11705/j.issn.1672-643X.2022.01.25


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                 BCDEF:TV138;TU46 3   GHIJK:A    GLMF:1672643X(2022)01017806
              Calculationofnonsteadygroundwaterflowinconfinedaquiferofacircular

                               excavationpitwithsuspendedwaterproofcurtain

                                          1
                                                                         2
                                                                                          2
                                                          2
                              GEXiaoyong,ZHANGShuyi,CHENZheng,WANGXudong
                        (1.NanjingJiangbeiNewAreaConstructionandTransportationCo.,Ltd.,Nanjing211816,China;
                           2.CollegeofTransportationEngineering,NanjingTechUniversity,Nanjing211816,China)
                 Abstract:Themechanismofgroundwaterflowintheexcavationpitwithsuspendedwaterproofcurtainis
                 verycomplex.Toexploretheflowcharacteristicsofgroundwatercausedbytheimplementationofthewa
                 terproofcurtainandpumpingwell ,anovelmodelisestablishedbasedonthenonsteadygroundwaterflow
                 inaconfinedaquiferbelowacircularfoundationpit.ByapplyingLaplaceandfiniteFouriercosinetrans
                 formstotheseepagemodel ,thesolutionofwaterheaddrawdownintheLaplacedomainisderived.Even
                 tually,thetimedomainnonsteadygroundwaterflowdrawdownintheconfinedaquifersubjectedtoexca
                 vationdewateringwithsuspendedwaterproofcurtainisobtainedusingtheStehfestmethod.Aftertheveri
                 ficationofthecalculationmethodandthenumericalinversetransformation ,thecalculationmethodisfur
                 therverifiedintheapplicationtoapracticalproject.Parametricstudyisalsocarriedouttoassesshowthe
                 flowcharacteristicsofgroundwaterareinfluencedbythepenetratingdepthofthecurtain.Resultsshow
                 thattheimplementationofthecurtainhasapositiveeffectonthegroundwatercontrolinsideandoutside
                 theexcavationpit.Theproposedcalculationmethodprovidesanewapproachfortherationaldesignofthe
                 decompressionanddewateringofconfinedaquiferbelowthecircularexcavationpitwithsuspendedwater
                 proofcurtain.
                 Keywords:suspendedwaterproofcurtain;circularexcavationpit;confinedaquifer;nonsteadyground
                 waterflow ;calculationmethod




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