Page 196 - 《水资源与水工程学报》2022年第4期
P. 196
!33 " ! 4 # & ' ( ) & * + , - Vol.33No.4
2022 $ 8 % JournalofWaterResources&WaterEngineering Aug.,2022
DOI:10.11705/j.issn.1672-643X.2022.04.26
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FGHIJ:U456.31 KLMNO:A KPQJ:1672643X(2022)04019210
Correctedsolutionofcomplexfunctionforgrounddisplacement
causedbyshieldtunnelconstruction
YANLi,YANGHaitao
(SchoolofCivilEngineering,ChangshaUniversityofScienceandTechnology,Changsha410114,China)
Abstract:Inordertoobtainthegrounddisplacementvariationcausedbyshieldtunnelconstruction,the
complexfunctionisusedtoobtaintheanalyticalsolutionofthetunnelaftershieldexcavationbasedon
displacementcontrolledboundaryconditions.Inthecalculationandanalysisprocess ,thedisplacement
releasecoefficientisintroduced ,andthedisplacementprocessoflininglaggingbehindtheexcavation
surfaceisfullyconsidered.Thetheoreticalcalculationsolutioniscorrectedbysettingthedisplacement
constraintpoint ,inordertoobtainamoreaccuratesurfacerelativedisplacement.Then,fouractual
shieldtunnelprojectsareselectedforthecasestudywiththeconsiderationoffourtypicalcaverndisplace
mentboundaryconditions.Theinitialsolutionofthesurfacedisplacementobtainedbythetheoreticalcal
culationiscomparedwiththecorrectedsolutionandthefieldmeasureddata.Theresultsshowthatno
matterwhichkindofcaverndisplacementboundaryconditionisselected ,theconsistencybetweenthe
correctedsurfacedisplacementvalueandthemeasuredvalueissignificantlyimprovedcomparedwiththe
initialsolution,amongwhichthecorrectedsurfacedisplacementsolutioncalculatedbythefourthdis
placementboundaryconditionhasthehighestconsistencywiththemeasuredvalue.Finally,theinfluence
ofdifferentdisplacementreleasecoefficients ,burieddepthsandradiionsurfacedisplacementisanalyzed
usingthefourthcaverndisplacementastheboundarycondition.Theresultsshowthatthesurfacesettle
mentandinfluencerangedecreasewiththeincreaseofthedisplacementreleasecoefficient;withthein
creaseoftheburieddepth ,thesurfacesettlementdecreasesbutthewidthofthesettlementtroughandthe
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