Page 131 - 《水资源与水工程学报》2023年第1期
P. 131

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

            DOI:10.11705/j.issn.1672-643X.2023.01.15


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                          Technologyandeffectsofconfinedwatercontrolofextra
                               deepcircularshaftexcavationinShanghairegion

                                                       LIUShujia
                                  (ShanghaiChengtouWaterGroupCo.,Ltd.,Shanghai201103,China)

                 Abstract:TheextradeepcircularshaftexcavationofYunlingandMiaopucomprehensivefacilityofthe
                 drainageandregulationprojectintheSuzhouRiversectionrequirestocontrolthewaterlevelofthethird
                 confinedaquiferinShanghaiforthefirsttime.Basedontheanalysisofthedistributioncharacteristicsof
                 theconfinedaquiferandthedewateringmeasurestakenbyYunlingcomprehensiveficility ,thecontrol
                 technologyandeffectsofdeepconfinedwaterinsoftsoilareaareanalyzedbasedonthemeasureddata.
                 Theresultsshowthatthetwolayerwaterisolationmeasuresofshaftgroundwallandoutercutoffwalla
                 doptedbytheprojectaccomplishedthedewateringofthethirdlayerconfinedwaterinShanghairegionfor
                 thefirsttime ,andthemaximum waterleveldropreached57.8m,whichensuredthestabilityofthe
                 foundationpit.Themeasureddatashowthatthewaterleveldropoutsidethecutoffwallwassmallerthan
                 thatbetweenthecutoffwallandtheretainingstructure,sowasthewaterleveldroprate.Thechangeof
                 porewaterpressureineachsoillayercorrespondedtothedewateringoftheconfinedwater.Aftertheres
                 torationoftheconfinedwaterlevel ,thedeepporewaterpressureonthesoilfacingsurfaceincreasedsig
                 nificantly ,andthedeeperthedepth,themoreobvioustheincreasingtrendoftheporewaterpressure;
                 however,thechangeofwaterpressureonthepitfacingsurfacewasrelativelygentle.Theconclusionscan
                 providesomereferencefortheconstructionofsimilarprojectsandthedevelopmentofdeepunderground
                 spaceinShanghairegioninthefuture.
                 Keywords:extradeepcircularshaft;confinedwatercontrol;thethirdconfinedaquifer;fieldmeasure
                 ment;porewaterpressure;Shanghairegion



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