Page 193 - 《水资源与水工程学报》2022年第6期
P. 193
! 33 " ! 6 # & ' ( ) & * + , - Vol.33No.6
2022 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2022
DOI:10.11705/j.issn.1672-643X.2022.06.24
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KLDMN:TU431;TV551.4 2 OPQRS:A OTUN:1672643X(2022)06018907
Foundationpitexcavationaffectsthreedimensional
stressofsurroundingsoilmass
1
2
2
1
1
2
HUANGXiangyu,LIShunqun,RUIZihang,BAOYiyong,XIANGChenxu,MAXiaohu
(1.SchoolofCivilEngineering,TianjinChengjianUniversity,Tianjin300384,China;
2.AnhuiShui’anConstructionGroupCo.,Ltd.,Hefei230601,China)
Abstract:Thechangesofthreedimensionalstressstateofthesurroundingsoilmassduringtheexcava
tionofafoundationpitprojectinHedongDistrict,TianjinCitywasstudied.Threedimensionalearth
pressureboxesareusedtomonitortheexcavationprocessofthefoundationpitonsite ,thenthemonito
ringresultsarecomparedwiththesimulationresultsofthefiniteelementmodeltostudythevariationlaw
ofthreedimensionalstress ,principalstressandprincipaldirectionofsoil.Theresultsshowthatthe
effectoffoundationpitexcavationonthesurroundingsoilmassisneitherpureloadingnorpureunloa
ding ;theinfluenceofexcavationprocessonthethreedimensionalstressstateofthesurroundingsoilmass
ismainlyreflectedbythenormalstress ,withlittleinfluenceontheshearstress.Themaindirectionwill
deflectwiththeexcavationofthefoundationpitandthemaximumdeflectionanglecanreach110°.Dur
ingtheexcavationofthefirstsection ,threedeflectionanglesof α , β , γhaveatendencyofapproaching
0°.Thechangecurvesof α and β generallyshowthecharacteristicsofsymmetrywith0°astheaxis.
Keywords:foundationpitexcavation;threedimensionalstressstate;numericalsimulation;principal
stress ;principaldirection
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