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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U111VerSl【y