盾構(gòu)施工開(kāi)挖面變形與破壞機(jī)理研究.pdf

1、河海大學(xué)博士學(xué)位論文盾構(gòu)施工開(kāi)挖面變形與破壞機(jī)理研究姓名：秦建設(shè)申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：巖土工程指導(dǎo)教師：朱偉盧廷浩20050501一皇璧璺t_——————————————一AbstractDuringshieldturmelling，supportpressurewhichisequaltotheoriginalstressatexcavafionsurfaceisusuallyappliedatexcavationsurfacetO

2、preventvannelling—inducedsoildeformationItowe、certhedesignandcontrolofappropriatesupportpressure#madodlffIcultbvthelargevariationofsoilconditionsanduncertaintiesinactualfiledconstructionInthefield，thesupportpressureisapp

3、liedthrou曲婦excavatedsoilmasswithorwithoutadditivesinworkingchamberofearthpressurefEP)shieldTherefore，theactualsupportpressureisstronglyinfluencedbythepropertyofthemixtureattheopenfaceFurthermore，suDportpressureshouldvarv

4、withoverburdencontinuouslyThe西evefaClOtSinailraisetheconcealOntheriskoffacestabili“ThUSitiSofpracticalsignificancetostudytheef[ectofstmportpresSulyeonsolldeFOrmationandfacestabititvInthispaperathree—dimensionalFastLagran

5、gianfinitedifferenceprogram(FI，AC)，WhichCUllsimulatelargestraindetormationandprogressivefailureisadoptedtostudythesolldetormalionandfailuremechanisminEPshioldtunnelIingThemaincontentsearlbesummarizedasfoflows：f1)fhcrelat

6、ionbetweenfacesupportpressureandsolldeFOrmationindicatesthatthe1nfiuenceofsupportpressureCallbefiguredasthreestages。Studiesonthevailationofstressrelaxaroundtheopenlaceduetothelovesupportpressureshowthattherelaxationratio

7、valloswiththeposition甜thesamesupportpressurer自#deterrninafionofstressrelaxationrati￡，issuggestedtobeinrelationwithsupportpressuref2、Thefailuremectmnisnloftheexcavationsur／ceandthedevelopmentof130st—faituredeformationforb

8、othsandandclayaremvestigatedItiSsuggestedthatthesollYoung’SmodulusbeconsideredindecidingwhethertoapplystresscontrolorstraincontrolinEPtunnellhlgStudy0nfailuredevelopmentatexcavationsurfacerevealsthattheexterEofpost—faila

9、redevelopmentiSstronglyrelatedtotheovercutinEPtunnelling(3)Sensitivitystudiesofsoilparameter，everhurdenand自1u3lleldiameterforthefacestabilityarecarriedOUtnumericallyTheresultsshowthat：i1thetIntrlelcanbeboredsafelyintheop

10、enmodewiththeincreaseofsoilstrength；ii)thelargertheoverburden，thelessminimizedsupportpressureandnloreinvisibleofdeformationongroundsurfaceduetofacecollapse；iii)theminimizedsupponpressurevarieswiththetunneldiameterapproxi

11、matelinearly(4)BasedOilnumericalsimulationsoftrapdoortests，thepressureoftheionsesoilcoverOneofthemostimportantparametersinwedgestabilitymodelforlimitingsupportpressure，isstudied。Thefonnulawhichtakesintoaccounttheallowabl