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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                              Foundationpitexcavationaffectsthreedimensional

                                          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:Thechangesofthreedimensionalstressstateofthesurroundingsoilmassduringtheexcava
                 tionofafoundationpitprojectinHedongDistrict,TianjinCitywasstudied.Threedimensionalearth
                 pressureboxesareusedtomonitortheexcavationprocessofthefoundationpitonsite ,thenthemonito
                 ringresultsarecomparedwiththesimulationresultsofthefiniteelementmodeltostudythevariationlaw
                 ofthreedimensionalstress ,principalstressandprincipaldirectionofsoil.Theresultsshowthatthe
                 effectoffoundationpitexcavationonthesurroundingsoilmassisneitherpureloadingnorpureunloa
                 ding ;theinfluenceofexcavationprocessonthethreedimensionalstressstateofthesurroundingsoilmass
                 ismainlyreflectedbythenormalstress ,withlittleinfluenceontheshearstress.Themaindirectionwill
                 deflectwiththeexcavationofthefoundationpitandthemaximumdeflectionanglecanreach110°.Dur
                 ingtheexcavationofthefirstsection ,threedeflectionanglesof α , β , γhaveatendencyofapproaching
                0°.Thechangecurvesof α and β generallyshowthecharacteristicsofsymmetrywith0°astheaxis.
                 Keywords:foundationpitexcavation;threedimensionalstressstate;numericalsimulation;principal
                 stress ;principaldirection

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