桥梁工程中刚性承台下桩的工作特性研究

23420048Vo1123No14JOURNALOFCHONGQINGJIAOTONGUNIVERSITYAug.,2004,1X,1,22(1.,213022;2.,210096):,.RandolphandWrothModel,.,Mindlin,..:;;:U443115:A:10012716X(2004)04200042051(rodelement),,,,,(1).,Mindlin,[1].1,RandolphandWrothModel[2,3]0w,.w=0r0/Grmr0dr/r0=0r0/G(1),=ln(rm/r0),rm=A(1-vs)/(1+n)L+Br0.[3,4].rm,RandolphandWroth(1978)[5],,rmg=rm+gg(2)g=1-e(1-h/L),hrm;g1P21P3,g=(013+012n)s,ssrm.[6],,Gt=G0(1-rRfs/f)2(3)(3)(1),wn=0r0/G0[ln((rm-)/(r0-))+(rm-r0)/(rm-)(r0-)](4)=0/f0Rfs.,Gz[4],G=Ag(g+z)n(5),Aggn,,.,AB3X:2003211223:(1962-),,,,.©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,AP,A,,2a;BP,A,(),2b;B,A,2c.2XRandolphandWrothModel,,,[7],r.B2A,w12=2r0/G[ln(rm/r0)-ln(rm/s)](6)AP,10,RandolphandWrothModel,B20,B22=20=10r0/s(7).(7)(6),w12=10r20/sG[ln(rm/r0)-ln(rm/s)](8)(8)B,A.,BA,A,=1/2.(8)(1),Aw=(1-r)0r0/Gln(rm/r0)(9)r,r=r0/2s[1-ln(s/r0)/ln(rm/r0)]22.1n,.,,(4);Mindlin;(9).,,,.,n,Pa,Pa=/n;,iPi,Ri=Pi/pa.3,,(),=015.49(3)16(4)25(5),s=4d.n(3).n,;,Pa,n,.,3n,n,,.,Ri54,:X(2001.2);(1997.4).©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.n().9(1).(,12mm),9Ri(4).,Ri4Ri,.().,,,Ri.,,,.,n,Ri(2).2su,,Ri=110(i=1,2,,n),.,Ri,(su),.n,su,,.,n,(),,,.19RisPmm123456789(1)3111801931118019301640193111801931118101111019611110196017501961111019611112011050198110501980188019811050198110530110001999019990199901999110011000199911003:(1)1s=1mm,.2Ri(1)31020su411100190110301971100110020911180164111101751105018827161139016011300166111701783625116001471150014911350154403:(1)1s=1mm.2.2sL,LDBPs95sPa.sPa,5.sRi(3).5,s,;,,.3,s,Ri,,su,.,9(3),s=4d,d=100cm,L10m20m40m80m.LPa,6.LRi,4.2025m,Ri,L.L25m,,.10mm,623©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.640m80m,(),,.,,L.,,().2.3GEp3,=300=1000=10000,L=40md=100cms=4d,9.3Ri(1)31020su3d111901601113017111060186304d111801641111017511050188276d1115016911080180110201922610d111201751105018811010198223:(1)1s=1mm.4LRiPmPmm(1)31020su1011200157110101971100110012151125014811050186110011001520112501481108017611001100182511240151111001721100110020401119016311110174110401892880111201751108018211030193403:(1)1s=1mm.3,,75.,,.1000,,7.,,Ri,Ri.,.3,:1)n,,Ri.,().2)s,(),.n.3)L,,.74,:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.5RiPmm(2)31020su3001107018211030192110101963810001111017511050185110101952610000111801571109017511000199203:(2)2s=2mm.,,,.4),.,(1000),.:[1]Poulos,H.G.andDavis,E.H.Pilefoundationanalysisanddesign[M].NewYork:JohnWileyandSons,1980.[2]Randolph,M.F.&Worth,C.P.Analysisofdeformationofverticallyloadpiles[J].J.Geotech.Enhing.Div.,1978,104(12):146521488.[3]Guo,W.D.,andRandolph,M.F.Anefficientapproachforsettementofpilesgroups[J].Geotechnique,1999,49(2):1612179.[4]Guo,W.D.VerticallyloadedsinglepilesinGibsonSoil[J].JournalofGeotechnicalandGeoenvironmentalEngineering,2000,126(2):1892193.[5]Randolph,M.F.&Worth,C.P.Ananalysisofverticaldeformationofpilegroups[J].Geotechnique1979,29(4):1572166.[6]Chow,Y.K.Analysisofverticallyloadedpilegroups,Int[J].J.forNumericalandanalyticalmechanics,1986,10(1):59272.[7],[J].,2003,33(3):3432347.StudyonbehaviorsofpilegroupunderrigidcapinbridgeEngineeringGUXiao2an,1LUMing2kang,1TENYu2min,2SHIMing2lei2(1.DepartmentofExpresswayConstrrctionofChangzhouCity,Changzhou213022,China;2.TransportationInstitute,SoutheastUniversity,Nanjin210096,China)Abstract:Onehybridmethodoffiniteelementanalysisofrodstructurecouplingwithloadtransferapproachforpilesgroupssettlementwases2tabished.Thebehaviorofshear2diaplacementoftheboundarybetweenpileandgroundwasdeterminedbytheRandolphandWrothModelintheapproachedclosedformsolution,couplingwiththehyperbolicmodel.TheactionofpilegroupswasevaluatedfromtheMindinequationsolution,andadjustedbythereinforcementandcurtainactionapproximately.Theinfluencesofnumberofpiles,thepilelength,thespacebetweenpiles,andthepile2soilrelativestiffnessfactoronthecharacteristicofpilegroupswareanalyzedinasystematicway.Keywords:interactionofpilegroup;pileswithrigidcap;settlementofpilegroup:823©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.