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基于单轴加卸载试验的千枚岩岩爆倾向性研究.docx

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基于单轴加卸载试验的千枚岩岩爆倾向性研究 Title:StudyontheProclivityofRockburstinQianmeiFormationBasedonSingle-axisLoading-UnloadingTest Abstract: Rockburst,asuddenreleaseofaccumulatedstrainenergyinrocks,posesgreatthreatstothesafetyofundergroundminingandtunneling.ThisstudyaimstoinvestigatetheproclivityofrockburstintheQianmeiFormationbyconductingsingle-axisloading-unloadingtests.Theexperimentalresultsprovidevaluableinsightsintothepotentialforrockburstoccurrenceandcontributetothedevelopmentofeffectivepreventionandcontrolmeasuresforrockbursthazardsinundergroundengineeringprojects. Introduction: Rockburstisadynamicphenomenonthatfrequentlyoccursinundergroundminingandtunneling.Itischaracterizedbythesuddenandviolentejectionofrockfragments,posingseriousriskstoequipment,personnel,andthestabilityofsurroundingstructures.TheQianmeiFormation,knownforitshighrockburstpotential,haswitnessednumerousaccidentsinrecentyears,necessitatingacomprehensiveinvestigationintoitsproclivityforrockburstoccurrence. Methods: Thesingle-axisloading-unloadingtestisawidelyusedmethodtostudyrockburstphenomena.Inthisstudy,coresamplesfromtheQianmeiFormationwereextractedandpreparedforlaboratorytesting.Thetestapparatusconsistedofahydraulicloadingdevice,straingauge,anddisplacementsensor. Results: Theresultsoftheloading-unloadingtestsrevealedimportantcharacteristicsofrockburstproclivityintheQianmeiFormation.Thesamplesexhibitednonlinearstress-straincurves,indicatingthepresenceofhighstressconcentrationzoneswithintherockmass.Moreover,thestrainratesduringunloadingdemonstratedsignificantjumpsatspecificstresslevels,suggestingtheexistenceofpotentialenergyaccumulationpoints. Discussion: Basedontheexperimentalresults,itcanbeinferredthattherockburstoccurrenceintheQianmeiFormationiscloselyrelatedtoitsgeologicalandmechanicalproperties.Thehighstressconcentrationzonesserveaspreferentialfracturepaths,enablingtherapidreleaseofstoredenergy.Theidentifiedpotentialenergyaccumulationpointsactascriticaltriggersforrockburstevents.Factorssuchasbeddingpla