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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FGHIJ:TV223.5;TU473 KLMNO:A KPQJ:1672643X(2023)01012708
Technologyandeffectsofconfinedwatercontrolofextra
deepcircularshaftexcavationinShanghairegion
LIUShujia
(ShanghaiChengtouWaterGroupCo.,Ltd.,Shanghai201103,China)
Abstract:TheextradeepcircularshaftexcavationofYunlingandMiaopucomprehensivefacilityofthe
drainageandregulationprojectintheSuzhouRiversectionrequirestocontrolthewaterlevelofthethird
confinedaquiferinShanghaiforthefirsttime.Basedontheanalysisofthedistributioncharacteristicsof
theconfinedaquiferandthedewateringmeasurestakenbyYunlingcomprehensiveficility ,thecontrol
technologyandeffectsofdeepconfinedwaterinsoftsoilareaareanalyzedbasedonthemeasureddata.
Theresultsshowthatthetwolayerwaterisolationmeasuresofshaftgroundwallandoutercutoffwalla
doptedbytheprojectaccomplishedthedewateringofthethirdlayerconfinedwaterinShanghairegionfor
thefirsttime ,andthemaximum waterleveldropreached57.8m,whichensuredthestabilityofthe
foundationpit.Themeasureddatashowthatthewaterleveldropoutsidethecutoffwallwassmallerthan
thatbetweenthecutoffwallandtheretainingstructure,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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