液电脉冲致裂试验与影响因素模拟分析

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中图分类号：TE242 文献标志码：A

Abstract：Electro-hydraulicpulseddischargeisatechnologythatcangenerate powerfulshock waves inliquids，whichcanbe used toeffectivelyfracturerocks.Inthisstudy，ndorexperimentswerefirstlycariedoutusingtwopiecesofself-madeoncretesamplessubjected tomultiple electro-hydraulicshock wavestoobservethefracturingeffect.Then，usingthenonlinear finiteelementsoftwareLs-dyna，theelectro-hydraulicpulseddischargewasconsideredtobeequivalenttocyclicunderwater explosiontoobtainan indirect simulationof therock fracturing processcausedby theelectro-hydraulicshock waves.The efectsofdischargedistance，charging energy，confining pressureanddischarge timesonrock fracturing wereanalyzed，and theorderof theinfluencedegreeofeach factoroncrack formation was givenbymeansoforthogonalanalysis.Theresults showthat，after3Otimes impactloadsgeneratedbyunderwaterpulseddischarge，crush zones，annularcracks，corercracks andlateral cracksappearedontheconcretesamples.Theannular cracks，corner cracks，and lateral crackscan be mainly caused byreflected tensile waves，circumferential tensile waves，and waterwedge efect.Crushzoneswere mainlycaused by thehead-onimpactofshock wavesand waterwedgeefect.Theformationofrock fracturescabbeinhibitedbyincreasing the confiningpressre，decreasingthechargingenergy，increasingthedischargedistanceanddecreasingthenumberofdischarges.Theorderoftheinibitioneffecttocrack formationoftheinfluencefactors isconfiningpressure，chargingenergy，discharge distance and the number of discharges.

Keywords：electro-hydraulic pulse；indoor experiment；fracturing mechanism；numerical simulation

液电脉冲放电是一种能够在液体中产生强有力冲击波的技术，因此被广泛应用于液电成型[1]、体外碎石[2]、解堵增渗[3]等领域。（剩余14611字）