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Kobe University Repository : Kernel
タイトルTit le
Analysis for deformat ion of foundat ion - theory and applicat ion ofDACSAR
著者Author(s) Xiangxia, Zhang
掲載誌・巻号・ページCitat ion 神戸大学都市安全研究センター研究報告,12:169-176
刊行日Issue date 2008-03
資源タイプResource Type Departmental Bullet in Paper / 紀要論文
版区分Resource Version publisher
権利Rights
DOI
JaLCDOI 10.24546/81001285
URL http://www.lib.kobe-u.ac.jp/handle_kernel/81001285
Create Date: 2018-06-01
神戸大学都市安全研究センター研究報告,第12号,平成20年 3 月
― 169 ―
― 170 ―
elements】muLallOnLopredlCtL九egroLLndbehavlOrandex-poreWaterpressuredLSSlpaLlonflOrImproved
grouTld、V】thALLCCconsTructlOnmethod(lowlmprOVerTlelltraLIOCenlentCOlunlnmethod)
2THEORETICALCHAlu CTERISTIC
DACSARLSused、vldeLyforItsadvantagesollCapab一eoFSOLL/watercoupLlnganalysts,multlple
elementsloslmuLatethebehavlOrOrthevarLOuStypesOrundergroundstrLLCIureCOmPOnentS.andthe
cons=utlVemodelswhlChhavesollpararTleteTSWlthclearestphysICalmeanlngSandmostcloselyTelaled
tothesollpa--ameLersusedlnthecLassLCalsollmeehanlCS
(1)SOIL-WATERCOUPLING
Forthesol1/、vateTCOuPLlng,thecons=utlVemodelaTldgovernlngequat10nSflOrdescrlblngthesrress-
stralnbehavlOrOrSOllskeletonandthepore、vaterflow shouldbecorLSldered ForD CS R,the
correspondITlggOVemlll呈equatlOnSareShownlrlfl呈urel
EqulllbrlUmeqUall0n
q.I/-0i:necllVe StressPnnCIPle
qJ/=Jv+ 仇 ∂LJSlrilm-dlSPlacementrLtliltIon
S.I--(〟,J・tLJ/2Cons川 UllVCreゎt10nShJP
J,I-C.;ash
Stress tX)undar)I
olvnJ=/,,,On ru
DISPlaccmentboundar)I
EL.=ZL,m r~
Dciwmall0nOl TTleporesolIskeleton WaternOW
も GSoll八\alereoupllngmOdcl日:日LE=二二二j
DitrCy~klllr
v,--N・,hJTotalWaterhead
JT=PJy.十n
ContlnULlyeqUallcm
WaterTICadboundar)I
h-A onrhVel∝lLVljoundar)r
G",=F.onry
FLg1ModelsandgovemlngequatlOrlSforSOll-Watercoupll]lg
(2)ELEMEEITSTYl'ES
F】vetypesofelemerLLstomodeLthebthavlOrOrthevarLOuSlyresOrundergroundstructure
compollentSareShowlllntable1SolldeEemenllStheonlyけpeofelemelltthatlnCLudesbothpore
― 171 ―
pressureandnonlmearbehavlOr
TabLeIFIVetypesaVallableelements
l23Roctく
l23
I234Springs
lつ34
(3)CONSTITUTIVEMOl)EL
TlleCOllSHutlVemodelsemployedlnDACSARformechartlCaLpropertleSOrSOlldelenlentSlnClude
L■nearclast■C.e]aslopLastrcandelasLO-∨■SCOPlast■cmodelssuchasSO(ScklguCh1-Cnta)modeL畠),EC
(Exponent■alconlraCtanCy)andLC(Logar■thrTl■CCOnt'aCtanCy)model6)somodellSaeLast■C-(V■sco)-
plasllCmodelproposedbySeklguChl良Ohla(L977),、vhlChcandescrLbethestress-lnducedanlSOtrOPyOr
theconsolldatedclaysbylnlroduclngane、VStressp・lramete rI7' ThegovernLngequatlOnSandtheyleld
surfaceforSOnlOdclarercspectlVelyshowTllnBoxlandr】gure2
Box]SOIEPmodeL
Tola】Strainincrements= EEJ-i.,P+6,;E'asticstmincomponenL: iJ;-ポポ 6JJ. l甫 i.,J
ssocia.ednowru■C= ivP-堵
Yie.dru..ction: I(6,,gv,)-,I/Dln阜Pl1
、vhe,e, JD =A二三1+eu・7.-鶴 -師 -a,1-p,.L
― 172 ―
EffectlveITYanStress,P. EftecllVemeanStress,P.
(alYleldsu,fzLCeOrSO_EPn.odel (b)SketchorsLJbEoadlngSuTraCe
Fl宍2YleldsurfaceorSOmodel
3L)EMONSTRATIOEN
ForoTleelemenLof-nomlalco】lSOLldat10nSOll、vlthtlleboundarycoTldlt10nS】10Wnlnfigure3、vlth
undmlnedanddL汀erentlestCOndltLOnSLnCludLngPLanestraln,aXLSym rTlelrlCanddlreCLShear,thesLress-
srraLllTeLatlOnandESP(effleCtlVeStresspath)ares】mulatedbyuslngDACSARwlthSO modelalld
LHuslraLedLnfigLLre4Thevaluesorparamete-sareshD、VnLntable2
〟 ararTletel-ら0.076 qL(kg/cm】) l.0
A 0_549 gl(kg/C■llZ) l.0
J 0.961 tl,O(1/m巾 0.00】%
0_394 ,4 0.245
'.. 0.65 ', 0.65F唱30neelenlentFEmesh
andboundarycondltLOn
Frg4STTeSS・STTalnrelatl011andefrectlVeStresspath
― 173 ―
4APPLJCATl0N
DACSAR hasbeenusedtoanalyzet】legroundbehavl0T,SuchasFortheflHlngSOILs,the
embankments.nlan-madelSland,brldgepleralldfounda†lOnd]lehexcavatlOne上c.lnthegeoLCChnlCal
erLglneeTlngCOnStruCt10】lformorethan20yearsByusITlgtheanalysISresults,moreeconoITllCaldeslgll
arLdcons【rLLCtlOnmethodcanbeattalnednthegeotechrLICaLenglneerlngCOnStruCtLDrL
OnecaseortherelnforcedfoundatlOnbyuslngALICCconstTtJCtIOnmethod(一owLmPrOVemenlratl0
cerTlentCOLumrLmethod)TortherlHLngSOl】SorembankmentISanalyzedLnPLanestralngeOmetr】eS,and
thecorTeSPOndlr唱Slmulat10llresultsrO1-thestress/stTalllalldporewaterpressurearel1)us什ated
(I)CENERALSITUATl0NOFGROUNL)
Flgure55ho、vsthesketchro√thesolHayercollSlltuLIOnandlrTlPrOVedgroundsLLuatLOnbyuslng
ALICCCOnSlruct1011method
YI
・,?
川
代m
恥
闇
Flg5SkelCTlforthesolHayerandImprovedareabyuslngALICCconstrucLIOnnleLhod
(2)CALCUL TlONMODEL
TheImprovedfoundatl0nbyuslngALICCconstnJCtl0nmethodcanbeanalyzedbyusln皇fTLll)te
elementmethodasthemodeLsho、vlllnr】gure6andthelmprDVedareacanbesJmulaLedbyu51JlgSOLld
elementforImprovedareaandJOlntelementforlnterfacebdweenTreatedandunTTeatedarea
― 174 ―
Flg6CalculatlOnmodelforALICCconsEruct10nmethod
(3)CALCULATlONRESULTS
ByuslngthedetermlnatLOrLProcedureorInputParametersProposedbylLZukaandOhta(】987)ror
DACSAR2),basedontheIll-Sltu■nVeStlgat10nalldraboratoTYtestS0日parametersareobtamed
llleSCLtlemcnlOrthetypLCa]partorgroulldonthe23LLhdayfromt∫lebeg】nr-1ngOrtheconslruCtlOn
lSShownlnFlgure7ltsho、vsthatl】leSenlementoftlleImprovedgroulldcallbeefTectlVelydecreased
byuslngtheAuCCconstrucL10nmethod
il
i)
iL
≡
(luaLLJaEnaS
ー【120 -10 0 10 20 30 40 50 60
XAxISTItle,ITT
Flg7SculementorLhetypLealpanofgroundonthe231Ehdayh・omthebcglnnlngOrthcconslruCtlOn
― 175 ―
llleSlmuLatlOnresults forL九edLSLrlbulLOnOfex-porewaterpressure,cf71eCt】Vemeanstre ss,and
volumen-lC S【raln,devFatOrlCStresslnthegroundWhentheemba】lknlellHSCOITIP)etedareShownlnthe
flgure8
(a)Ex-porewaterPreSSure (b)Efrecl・venleanStress
(clVolurTletrlCStTaln (dlDevla【orlCStress
Flg8SlmulaI10nresultsFordlsTnbutl0nOfex-pore、vateTPressure.effleCtlVemeaTIStress,
andvo】umeLrlCStralndevlatOrlCStresslntheflOurLdaLlon
5.CONCLUSl0NS
ThemancharacterLSIICSOrtheprogramareden10nStratedln deLallandthelyplCalappllCaLIOnOrthe
DACSARISIHusTratedthroughone2DeLasto・plas【lCSell/watercoupllngflnlteelements】mulatlOnlt
hasbeenroundthat、VILhthealdofthenumerlCaLanalysLSSuchasfinlleelementmethodthestress/sLralJl
andex・porewaterdlStr】bull0nlnthegrou]ldareyISuallZeda】ldmoreeco】10mlCalandsafedeslgnIllthe
geoLechlllCa)erLglneerLngCOrLSLructLOrLearLbeatlalned
― 176 ―
ACKNOWLEDGMENT
TTleauthorLSgrateflultoProfllZukaA forprovldlngSourceCodeofLDACSAR,pertlnentllteTatures
andanumberorhelpfu)SuggesLlonsGratcfuLthanksaremadetoresearchersLnllZLLkalabKobe
Umverslty,andOhtaLABlnTokyoUnlVerSIUofLTecllnOlogyforthelrteCllnlealassIStanCe
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