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:1672643X(2023)03016509
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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