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基于非接触监测深埋软弱破碎围岩隧洞破坏试验研究.docx

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基于非接触监测深埋软弱破碎围岩隧洞破坏试验研究 Abstract Inrecentyears,theconstructionofundergroundtunnelshasbecomeincreasinglyimportant,andthesafetyoftunnelengineeringhasbecomeafocusofattention.Inthisstudy,anon-contactmonitoringmethodwasusedtoanalyzethesoftandweakfracturedsurroundingrockofadeepburiedtunnelandinvestigateitsfailuremechanism.Theresultsshowedthatnon-contactmonitoringmethodscaneffectivelydescribethedeformationandfailurecharacteristicsofsoftandweakfracturedsurroundingrock.Moreover,thedeformationandfailurecharacteristicscouldbedividedintothreestages:crackinitiation,crackpropagation,androckcollapse.Thenon-contactmonitoringmethodcouldprovidereal-timemonitoringdata,whichcanhelpimprovethesafetyandstabilityoftunnelengineering. Keywords:non-contactmonitoring,deepburiedtunnel,softandweakfracturedsurroundingrock,failuremechanism,safetyandstability Introduction Theconstructionofundergroundtunnels,suchassubwaysandminingtunnels,hasbecomeincreasinglycommoninrecentyears.However,thesafetyandstabilityoftunnelengineeringhavebecomeimportantconcernsbecauseoftheunpredictableconditionsofundergroundconstruction.Thestabilityofsurroundingrocksisoneofthecriticalfactorsthataffecttunnelengineeringsafety.Ifthesurroundingrockissoftandweak,itwillbepronetodeformationandfailure,whichwillcausedamagetothetunnelstructureandaffectthesafetyoftheengineering. Therefore,thedeformationandfailuremechanismofsoftandweakfracturedsurroundingrockisacriticalissueinthedesignandconstructionofdeepburiedtunnels.Traditionalmonitoringmethods,suchasconcretestraingaugesandexcavatedrockcrackmeasurements,canonlymonitorspecificpointsorareasandcannotobtaincomprehensivedeformationandfailuredata.Thenon-contactmonitoringmethod,whichisbasedondigitalimagecorrelation(DIC)technology,hasadvantagesinreal-timemonitoring,full-fieldmeasurement,andnon-contactmeasurement.Consequently,itcanbeusedtodescribethedeformationandfailurecharacteristicsofsoftandweakfracturedsurroundingrock.Inthisstudy,non-contactmonitoringwasusedtostudythefailurecharacteristic