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1、ARTICLEINPRESSInternationalJournalofRockMechanics&MiningSciences41(2004)761–769Measurementsofinducedstressandstrengthinthenear-?eldaroundatunnelandassociatedestimationoftheMohr–Coulombparametersforrockmassstrengtha,bY.Obara*,Y.IshiguroaDepartmentofCivilEngine
2、ering,KumamotoUniversity,2-39-1Kurokami,Kumamoto,860-8555,JapanbChubuElectricPowerCo.Inc.,Nagoya,JapanAccepted14January2004AbstractThestateofinducedstressmeasuredbythecompactconical-endedboreholeovercoringtechniqueintheimmediateroofofanapproachtunnelexcavated
3、underhighrockstressisdescribed.Duringthemeasurements,corediskingwasobserved.AnX-rayComputedTomography(CT)scannerwasusedtoselectstraindataunin?uencedbythecoredisking;thentheinducedrockstresswasestimatedfromselectedstraindata.Fromtheseresults,itisshownthattheno
4、n-destructiveinvestigationusingX-rayCTiseffectiveforvisualizationofthefracturingwithincoresandtheselectionofstrainsmeasuredduringovercoring.Furthermore,theMohr–Coulombfailurecriterionparametersfortherockmasswereestimatedbycomparingthemeasuredstresseswiththesh
5、earstrengthofinsiturockandtheuniaxialcompressivestrengthdeterminedinlaboratorytests.r2004ElsevierLtd.Allrightsreserved.Keywords:Rockstress;Compactconical-endedboreholeovercoringtechnique;Coredisking;X-rayCT;Rockstrength1.Introductionovercoring.Whenthephenomen
6、onofcorediskingisobserved,themeasuredstraindatacannotbeutilizedtoTheinitialrockstressmeasurementforthedesignofdeterminetherockstressintheCCBOmethod.InorderanundergroundpowerhouseinJapanwas?rstlytoselectthestraindataunin?uencedbythecoredisking,performedinthe?e
7、ldbythecompactconical-endedanX-rayCTscannerwasappliedtotherecoveredcore,boreholeovercoring(CCBO)technique,whichisoneofandthentheinducedrockstresswasestimatedfromthethestressreliefmethods[1–4].Thestateofinitialstressselecteddata.Basedontheseresults,itisshownth
8、attheisthatthemaximumprincipalstressdirectionisinthenon-destructiveinvestigationbytheX-rayCTishorizontalplaneandisEast–West.Therefore,theeffectiveforvisualizationoffractureswithinthecorel
