Page 169 - 《水资源与水工程学报》2023年第3期
P. 169

!34 " ! 3 #                       & ' ( ) & * + , -                               Vol.34No.3
               2023 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2023

            DOI:10.11705/j.issn.1672-643X.2023.03.21


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                 ABCDE:U456.3 1   FGHIJ:A    FKLE:1672643X(2023)03016509
                         Grounddeformationandstressanalysisofshieldtunnelin
                                         rockandsoilcompositestratum

                                                           1
                                                 1
                                                                                   1
                                                                         2
                                     YANGHaitao,YANLi,YANZhiwei,WUHao
               (1.SchoolofCivilEngineering,ChangshaUniversityofScienceandTechnology,Changsha410114,China;2.KeyLaboratory
                       ofTunnelEngineering ,MinistryofEducation,SouthwestJiaotongUniversity,Chengdu610031,China)
                 Abstract:Consideringthedifferenceofmechanicalpropertiesbetweenrockandsoilmass,themechani
                 calanalyticalmodeloftunnelexcavationingeotechnicalcompositestratumisestablishedusingthecom
                 plexvariablefunctioncombinedwithstochasticmedium theory.Thenthetheoreticalcalculationresults
                 arecomparedwithnumericalsimulationandfieldmeasurementresults.Theresultsshowthattheanalyti
                 calsolutionandnumericalsolutionareingoodagreementwiththemeasuredvalues ,andthesettlement
                 troughwidthofnumericalsolutionandtheoreticalsolutionareconsistent ,whichindicatesthatthetheoret
                 icalcalculationmethodhashighreliability.Thentheeffectsofdifferentverticalloadsactingonrock-
                 soilinterface ,theratioofburieddepthtoradiusofrocktunnelandPoisson’sratioofrockmassonsur
                 facedeformationandstressaroundtunnelarediscussed.Theresultsshowthatwiththeincreaseofthe
                 verticalloadoftherock-soilinterface ,thesurfacesettlementalsoincreases,andthecircumferential
                 compressivestressaroundthetunnelincreasessignificantlynearthearchwaist ,whilethecircumferential
                 tensilestressofthevaultchangesrelativelyslowly.Withthedecreaseofthedepth-diameterratioh/r,
                 thesurfacesubsidencealsoincreases.Whenh/r ≥3,theincreaseofthedepth-diameterratiohasarel
                 ativelysmallimpactonthecircumferentialstressaroundthecave.ThegreaterthePoisson’sratioofthe
                 rockmass ,thesmallerthesurfacesettlement,andthemoreuniformthecircumferentialstressdistribution
                 aroundthecave,andviceversa.
                 Keywords:soilandrockcompositestratum;shieldtunnel;soildeformation;stressaroundthecave;
                 stressanalysis;complexvariablefunction;stochasticmediumtheory


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