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上软下硬地层浅覆土超大直径盾构扰动规律研究AbstractThestudyonthedisturbancelawofsuperlargediametershieldtunnelinginsoftandhardstratacoveredbyshallowsoiliscarriedoutwiththeaimofreducingtheimpactoftunnelingonthesurroundingenvironment.Basedonthefieldmeasurementsandliteraturereview,thedisturbancecharacteristicsoftheshieldtunnelingindifferentstrataareanalyzed.Theresultsshowthatthedisturbancecausedbyshieldtunnelinginsoftstrataismainlyconcentratedinthehorizontaldisplacement,whileinhardstrata,thedisturbanceismainlycausedbyverticalsettlement.Thereasonforthisdifferenceisduetothedifferentdeformationcharacteristicsofsoftandhardstrata.Atthesametime,itisfoundthattheexcavationdiameteroftheshieldhasasignificanteffectonthedisturbancecharacteristics.Thelargertheexcavationdiameteris,thegreaterthedisturbanceis.Inthedesignoftheshieldtunnelingproject,itisnecessarytocomprehensivelyconsiderthevariousfactorsthataffectthedisturbance,inordertoreducetheimpactonthesurroundingenvironment.Keywords:Shieldtunneling,Softandhardstrata,Shallowsoil,DisturbancelawIntroductionWiththerapiddevelopmentoftransportationinfrastructureinrecentyears,theconstructionofshieldtunnelinghasbecomemoreandmorepopular.However,theconstructionofshieldtunnelingcancausegreatdisturbancetothesurroundingenvironment,resultinginthedeformationofbuildings,damagetoundergroundpipelinesandotherengineeringfacilities,andeventheoccurrenceofgeologicaldisasters.Therefore,howtoreducethedisturbancecausedbyshieldtunnelingisanimportantissueintheconstructionoftransportationinfrastructure.Inthispaper,thedisturbancelawofsuperlargediametershieldtunnelinginsoftandhardstratacoveredbyshallowsoilisstudied.Thedisturbancecharacteristicsofshieldtunnelingindifferentstrataandtheinfluenceofexcavationdiameteronthedisturbanceareanalyzed,inordertoprovideareferenceforthedesignandconstructionofshieldtunnelingprojects.DisturbanceCharacteristicsofShieldTunnelinginSoftandHardStrataCoveredbyShallowSoilThedisturbancecharacteristicsofshieldtunnelingareaffectedbymanyfactors,suchasthegeologicalconditions,theconstructiontechnology,theshieldtype,andtheexcavationdiameter.Amongthem,thegeologicalconditionsarethemostimportantfactoraffectingthedisturbancecharacteristics.Insoftstrata,thedeformationcharacteristicsofthestrataaremainlyhorizontaldisplacement,andthedisturbancecausedbyshieldtunnelingismainlyconcentratedinthehorizontaldisplacement.Thehorizontaldisplacementoftheshieldtunnelingismainlycausedbytheinteractionbetweentheshieldandthesoil,andthedeformationofthesoilismainlyinthehorizontaldirection.Thehorizontaldisplacementofthesoilcancausethedeformationofnearbybuildings,andevencausethebuildingtotiltorcrack.Inhardstrata,thedeformationcharacteristicsofthestrataaremainlyverticalsettlement,andthedisturbancecausedbyshieldtunnelingismainlycausedbyverticalsettlement.Becausethehardstratahashighstrengthandlowdeformation,theinteractionbetweentheshieldandthesoilismainlyintheverticaldirection.Theverticalsettlementofthesoilcancausedamagetoundergroundpipelinesandotherengineeringfacilities,andevencausegeologicaldisasterssuchaslandslidesandcollapse.Inaddition,thetypeofshieldalsoaffectsthedisturbancecharacteristics.Theexcavationdiameteroftheshieldisanimportantfactoraffectingthedisturbancecharacteristics.Thelargertheexcavationdiameteris,thegreaterthedisturbanceis.Therefore,inthedesignandconstructionoftheshieldtunnelingproject,itisnecessarytocomprehensivelyconsiderthevariousfactorsthataffectthedisturbance,andtakeappropriatemeasurestoreducetheimpactonthesurroundingenvironment.ConclusionThedisturbancelawofsuperlargediametershieldtunnelinginsoftandhardstratacoveredbyshallowsoilisstudiedinthispaper.Thedisturbancecharacteristicsofshieldtunnelingindifferentstrataandtheinfluenceofexcavationdiameteronthedisturbanceareanalyzed.Theresultsshowthatthedisturbancecausedbyshieldtunnelinginsoftstrataismainlyconcentratedinthehorizontaldisplacement,whileinhardstrata,thedisturbanceismainlycausedbyverticalsettlement.Theexcavationdiameteroftheshieldhasasignificanteffectonthedisturbancecharacteristics.Thelargertheexcavation
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