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1、InternationalJournalofRockMechanics&MiningSciences57(2013)142–152ContentslistsavailableatSciVerseScienceDirectInternationalJournalofRockMechanics&MiningSciencesjournalhomepage:www.elsevier.com/locate/ijrmmsTechnicalNoteAssessmentofvelocityanisotropyinrocksa,nbabT.Lokajı´cˇek,R.KGoel,
2、V.Rudajev,R.D.DwivediaInstituteofGeology,AcademyofSciencesoftheCzechRepublic,v.v.i.,Praha6,Lysolaje,CzechRepublicbCentralInstituteofMiningandFuelResearchRegionalCentre,CBRICampus,Roorkee,IndiaarticleinfoArticlehistory:Received13November2010Receivedinrevisedform19May2012Accepted11July
3、2012Availableonline23October20121.Introductionmeasurements,onrocksamplesofgranitesandgranulites;thesecondaimistoanalyzetheacousticemission(AE)arisingfromLowercrustalanduppermantlerocksexposedattheEarth’sthereactionofbothrocktypesontheactinguniaxialloading.surfaceprovideadirectpossibi
4、lityofmeasuringtheirphysicalThemeasurementsofthedirectionaldependenceofP-wavespropertiesthatmust,inothercases,beassessedusingindirectvelocitiesweremadeonsphericalrocksamplesin132indepen-methods.Theresultsofdirectmeasurementscanthenbeusedtodentdirectionsatselectedlevelsoftheconfiningpr
5、essure.Thiscorrectthevaluesbasedontheindirectdata.hashelpedinconstructingP-waveisolinesmaps(P-wavevelocityElasticpropertiesbelongtothemostimportantparameters3Ddistribution)orinplottingtheP-wavevelocityconfiningstudiedingeophysicsandareemployedinmanyfieldsofearthpressurebehaviorinacerta
6、indirectionupto400MPa(comparesciences.Inthelaboratory,dynamicelasticpropertiesofrocksareexperimentalset-up).Thismethodrevealedalargedirectionalcommonlytestedinthreemutuallyperpendiculardirections.ThevarianceinthemaximumP-wavevelocityanddifferentsymme-spatialdistributionsofP-andS-wave
7、velocitiesarethencomputedtries(orthorhombicvs.transverseisotropic)oftheelasticwaveusingtexturaldata,modalcomposition,densityandelasticconstants3Ddistributionthathasnotbeenrecordedontheserocksbefore.[1,2].Itisvirtuallyimpossibletoinvolveallmicro-fabricparametersThereareseveraladvantag
8、estothepropo
