Page 91 - 2022年第53卷第9期
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Analysisofvibrationdifferencesinducedbydifferenttypicalblast - holesand
theinherentcausesinexcavationofhydropowerdam foundation
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ZHOUHaixiao,GAOQidong ,WANGYaqiong,FANYong,LUWenbo,LENGZhendong 4
(1.SchoolofHighway,Chang’anUniversity,Xi’an 710064,China;2.HubeiKeyLaboratoryofConstructionand
ManagementinHydropowerEngineering,ChinaThreeGorgesUniversity,Yichang 443002,China;3.KeyLaboratoryof
RockMechanicsinHydraulicStructuralEngineeringMinistryofEducation,WuhanUniversity,Wuhan 430072,China;
4.GezhoubaGroupExplosiveCo.,Ltd,Chongqing 401121,China)
Abstract:Thestudyonthevibrationcharacteristicsinducedbydifferentkindsofblast - holesinhydropowerdam
foundationexcavationisofsignificanceforthesafetycontrolofblastvibration.Basedononsiteblastingexperi
ments,thePeakParticleVelocity(PPV)andtheDominantFrequency(DF)ofblastvibrationinducedbythe
productionblast - holes ,thepresplittingblast - holesandsmoothblast - holeswerecomparedindamfoundationexca
vation.Moreover,combiningwiththeanalysisoftheblastingboundaries,thedynamicresponsesofrockmass
werestudiedbyusingthenumericalsimulationsoftware.Finally,theinherentcausesofthedifferencesofvibration
inducedbydifferentkindsofblast - holeswerediscussed ,fromtheviewsofthedistributionofexplosionenergyand
thedevelopmentofplasticzone.Theresultsindicatethatwhenthemaximumchargeofeachshotandthedistance
betweentheexplosivecenterareatthesamelevel,thePPVandtheDFinducedbypresplittingblast - holesarerel
ativelylargerthanthoseinducedbyproductionblast - holesandsmoothblast - holes,whilethePPVandDFinduced
bysmoothblast - holesareapproximatetotheproductionblast - holes.Thepresplittingblast - holesarealwaysthe
firstfiredblast - row.Theirburdenwidthisthusbiggerthanthatofproductionblast - holesandsmoothblast - holes.
Moreover ,theexplosivescharginginthepresplittingblast - holesaregenerallyradiallyandaxiallydecoupledwith
therockmass,sotheyarelaterallyinitiatedbythedetonatingcord.Asaresult,theblast - induceddamagezone
andtheplasticzoneisrelativesmaller.Therefore ,lessenergyisconsumedbyrockfragmentationandmoreexplo
siveenergyistransmittedintovibrationenergy.Thesmoothblast - holeshavethesimilarchargingstructureandini
tiationmodewithpresplittingblast - holes ,buttheburdenwidthofsmoothblast - holesissmaller.Consequently,
theblast - inducedplasticzoneandtransmittedvibrationenergyofsmoothblast - holesaresimilarwiththatofpro
ductionblast - holes.Theblastingboundary (i.e.,chargingstructure,initiationmodeandburdensizeetc.)plays
animportantroleonthedistributionofplasticzoneandexplosionenergy ,whichistheinherentcauseofthediffer
encesofvibrationcharacteristics.
Keywords:hydropowerdamfoundation;rockblasting;differentkindsofblast - holes;blastingboundary;vibra
tiondifferences
(责任编辑:于福亮)
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