基于FLAC3D液化土中桩基侧向动力特性数值模拟研究_李雨润

4521201511BuildingStructureVol．45No．21Nov．2015FLAC3D*121113004012300401。FLAC3D。0.15gElCentro。FLAC3DTU473A1002-848X201521-0070-04NumericalsimulationstudyonlateraldynamiccharacteristicsofpilefoundationinliquefiedsoilbasedonFLAC3DLiYurun12WangXiaoyan1LuoXiang11CollegeofCivilEngineeringHebeiUniversityofTechnologyTianjin300401China2CivilEngineeringTechnologyＲesearchCenterofHebeiProvinceTianjin300401ChinaAbstractThedynamicresponseofpilefoundationunderthestrongearthquakeactionhasbeenahotresearchissueinseismicfieldsofsoildynamicsandgeotechnicalengineering．BasedontheshakingtabletestofpilefoundationinliquefiedsoilthefinitedifferencesoftwareFLAC3Dwasusedtocarryoutnumericalsimulationandthesimulationresultswerecomparedwiththeexperimentalresults．Theresultsshowthatthelateraldynamicresponseofpilefoundationisobviouswiththeincreaseofthewavepeakaccelerationunderdifferentworkingconditionsinputbysinewave．Thesandysoilisliquefiedandthelateraldynamicresponsereachesthemaximumespeciallywhenthepeakaccelerationis0.15g．UnderElCentroearthquakewaveinputtheshapeandthenumericalvalueoftheaccelerationtimehistorycurveareslightlydifferentindifferenttimeandtheshapeofthedisplacementtimehistorycurveisingoodagreementwiththenumericalvalue．Thelowerporepressureratioinexperimentdecreasesslightlyandthedeclineoftheporepressureratioinsimulationisnotobvious．Theporepressureratioinsimulationissmallerthanthatinexperimentintheearlytime．KeywordsshakingtabletestliquefiedsoildynamiccharacteristicFLAC3Dnumericalsimulation*51008110E20132021182014M5611692014-231。[e-mail]。0、、、、、、。。11Loma-prieta。、2。FLAC3D。14521．FLAC3D11.13。1.245。550mm×340mm×320mm1。52.1mm×52.1mm×19.6mm0.52kg。220mm30mm4cm。24.10mm41.00mm。1/mm/mm/mm/N·m251310.2012.1033.5350.31.3FBG2。1.4ElCentro2。2ElCentro/Hz5550～10/g0.050.100.150～0.202540mm×330mm×300mmFLAC3DBrickCylinder。Brick、Cylinder。3。、。FLAC3DFinn3。23Δεvd=C1γ－C2εvd+C3ε2vdγ+C4εvdΔεvdεvdγC1C2C3C4。Finn3/MPa18.5258.33×103/MPa7.57626.92×103/°35500Finn4C1C2C3C4C1=0.8C2=0.79C3=0.45C4=0.7333.110s。0.15g445。4/g/g/mm0.050.0360.0580.470.6261.611.3320.100.0730.130.841.4811.781.7630.150.10370.281.1523.82.703.30.050.0440.07180.560.771.641.3740.100.0870.16170.991.8461.861.8470.150.1250.341.3664.6132.723.377。4。417201540.15g0.15g0.15g0.15g。5。50.05g0.10g。0.15g660.15g。63.2ElCentro7ElCentro。7ab。7cd。ElCentro5。50.343g19.1mm1.881.230.373g19.9mm2.021.26。ElCentro885～7.5s0.15g274521．FLAC3D7ElCentroElCentro5/g/mm0.1820.34315.4819.11.881.230.1850.37315.7819.92.021.268ElCentro。4ElCentro10.15g。FLAC3D。2ElCentro。。3ElCentro。。1．J．2013432399-104．2．--J．．2012323180-186．3．OpenSeesPLJ．201545885-90．4．--D．2012．5．J．201434140-45．37