Abstract: Whenthetwo-lanetunnelinthemountainousareaisexcavatedbythedrillingandblasting method,theconstructionofthereartunnelwillinevitablyproduceunfavorablevibrationeffects,thusaffectingthesafetyandstabilityoftheprecedingtunnel.Therefore,thevibrationtestandanalysisofadjacenttunnelblastingisofgreatsignificanceforthesafeconstructionofdouble-linetunnels.Inthispaper,basedon the two-line tunnel project of the Xingyan Expressway,the following conclusions ard drawnbyconductingon-sitevibrationtestsonitstunnelaxis:①Therelationshipbetweenthethreedirectionsofvibrationintensityintheadjacenttunneltestareais:verticaldirection>horizontalradial> horizontalaxis,andthesizerelationshipisrelativelyfixed.Astheblastingdistanceincreases,thedifferenceinvibrationintensitybetweenthethreedirectionsgraduallydecreases.②Theclampingofcutting holeisthebiggestandtheblastingvibrationintensityisthebiggest.③Theblastingvibrationwaveforms
ofdifferenttypesofblastholeshaveaphenomenonofrapidlyincreasingfromtheinitialvaluetothe peakvalueofthevibrationvelocity,andtheattenuationprocessisrelativelyslow,andthisphenomenon isparticularlynoticeableintheblastingofthecuthole.④Inthedouble-linetunnelblastingconstruction,reducingthemaximumsingle-stagedoseofthecuthole,increasingthedetonatorsection,decomposingthetunnelexcavationsection,andcontrollingtheblastingscaleareeffectivewaystoreducethe blastingvibration.