超高压水射流冲蚀切割岩石断口微观断裂机理实验研究

194Vol.19,No.4200512CHINESEJOURNALOFHIGHPRESSUREPHYSICSDec.,2005:100025773(2005)042033720631,2(1.(),102249;2.(),257061):,,,,,,;,:;;;:TP69:A1[1],,,,,,,,[2],,,,,,,,[3,4],,22.1()(PWJ2B22),1,300MPa,22kW,2L/min,0.3mm,1.91mm/s,23:2004210219;:2005201217:(50234030);(50125413):(1961),,,,,.E2mail:[e-mail],,,,,;,KYKY228001Fig.1Theschematicviewofjetcuttingmachine2Fig.2Thegeometryofnozzle2.2,,,11Table1ThemechanicspropertiesofrocksamplesforthetestNo.SampleDensity/(g/cm3)Elasticmodulus/(GPa)PoissonsratioCohesive/(MPa)Frictionangle/()Tensilestrength/(MPa)1Whitemarble2.8436.960.1325.1942.951.052Redgranite2.6824.330.1743.4245.211.483Blackgranite3.1143.750.1458.0842.232.512.3,,150MPa,Bernoulli,547.7m/s,2.0mm/s,510mm,,,3,3.1,,3,,,;,,,83319,,,,(a)Longregularslot(b)Funnelshapecrater3Fig.3Therockshapeofcuttingslotbywaterjetsimpact3.2[36],(1),,,4;,,,54Fig.4Thesliceoftherockbytensiontest5Fig.5Thesliceoftherockbytri2axialunloadedtest(2),,,,673.33.3.1,,,,,8(a)8(c),,8(a)9334:,,;8(b)8(c),,,,,,,,,()200MPa,20mm,,6Fig.6Thesliceoftherockbysheartest7Fig.7Thesliceoftherockbycompressiontest(a)Whitemarble(b)Redgranite(c)Blackgranite8Fig.8Thepatternofrockfailureofdilapidatedslicesurface3.3.2,,,9(a)9(c),,9(a)9(c),9(c);9(b),,,,,;,04319(a)Whitemarble(b)Redgranite(c)Blackgranite9Fig.9Thepatternofrockfailureofslotconcaveandsidesurface4,,,,;,,,References:[1]ShenZH,LiGS,WangRH.ApplicationandProspectsofWaterJetTechnologyinPetroleumEngineering[J].JournalofChinaEngineeringScience,2002,4(12):60-65.(inChinese),,.[J].,2002,4(12):60-65.[2]LiaoHL,LiGS,XiongW.DevelopmentofUltra2HighPressureWaterJet2AssistedDrillingTechnology[J].Chi2neseJournalofRockMechanicsandEngineering,2002,21(Suppl2):2583-2587.(inChinese),,.[J].,2002,21(2):2583-2587.[3]XieHP,ChenZD.Micro2FailureMechanismAnalysisforRocksFailureSurface[J].JournalofChinaCoalSocie2ty,1989,14(2):57-66.(inChinese),.[J].,1989,14(2):57-66.[4]LiuXM,LeeCF.MicroFailureMechanismAnalysisandTestStudyforRockFailureSurface[J].ChineseJournalofRockMechanicsandEngineering,1997,16(6):509-513.(inChinese),.[J].,1997,16(6):509-513[5]FengT,XieXB,PanCL,etal.FractureMechanismAnalysisforBurstRockwithElectronScanningMicroscope[J].JournalofCenterSouthUniversityofTechnology,1999,30(2):14-17.(inChinese),,,.[J].,1999,30(2):14-17.[6]TanYA.AnalysisofFracturedFaceofRockBurstwithScanningElectronMicroscopeandItsProgressiveFailureProcess[J].JournalofElectronMicroscope,1989,8(2):41-47.(inChinese).[J].,1989,8(2):41-47.1434:Micro2FailureMechanismAnalysisandTestStudyforRockFailureSurfaceunderWaterJetImpactLIGen2Sheng1,LIAOHua2Lin2(1.FacultyofPetroleumEngineering,ChinaUniversityofPetroleum,Beijing102249,China;2.CollegeofPetroleumEngineering,ChinaUniversityofPetroleum,Dongying257061,China)Abstract:Therockbreakingmechanismbywaterjetsimpacthasnotbeenclearlyrecognizedasyetforcomplicatedprocessofrockdamage.Thetestofcuttingrockswithsubmergedhigh2pressurewaterjetsimpactbyanumericalcontrollingjetcuttingmachineareconducted.Then,thetestforthepatternoffailuresurfaceofcuttingslotsanddilapidatedslicesareperformedwithscanningelectronmicroscope(SEM)tostudymicrofailuremechanismofrockswithwaterjetsimpinging.Theresultshowstwotypesofrectangleshapeandshallowfunnelshapecratersintherockmatrixes.Theanalysisshowsthatthemicro2mechanismofrockfailureduetowaterjetsimpingementisabrittlefractureintheconditionoftensileandshearingstress.Keywords:waterjets;rockcutting;breakingmechanism;SEM24319