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1、InternationalJournalofRockMechanics&MiningSciences38(2001)167–180Mining-inducedstresschangeandconsequencesofstresspathonexcavationstability}acasestudyP.K.Kaiser*,S.Yazici,S.MaloneyMIRARCO-MiningInnovation,LaurentianUniversity,935RamseyLakeRoad,Sudbury,Ont.,CanadaP3C2C6Accepted24M
2、ay2000AbstractForstabilityassessmentsaswellasforsupportdesign,itisimportanttounderstandthefactorsleadingtodetrimentalstresschanges.Stresschangesnotonlyinfluencethedemandontherocksupport,theyalsochangethesupportcapacityoffrictionalsupportcomponentssuchasplaincablebolts.Stressandstr
3、esschangesarecommonlypredictedbynumericalmodelsbutitisrarelypossibletoverifythesepredictions.Thisstudypresentsapracticalexampleillustratingtheusefulnessofstresschangemeasurementsinprovidinganaccuratepictureofthemining-inducedstresschangesandtheirvaluefornumericalmodelcalibration.
4、Stresschanges,associatedwithminingofthe565#6stopeatWinstonLakeMine,weremeasuredbyfourCSIROHIstresscells,twointhehangingwallandtwointhebackofasilldrift.Inordertoobtainthefullstresshistoryofthehangingwall,stressesattheinstallationtimewerecalculatedbyuseofathree-dimensionalboundarye
5、lementprogram}MAP3D.Twotypesofrockmassfailurewereobservedatthismine:hangingwalldelaminationandcollapseleadingtooredilution,andwedge-likefailuresinthebacksofsilldrifts.Allstresscellswerelocatedsuchthattheywereaffectedbythesefailuremechanisms.Usingmeasuredandpredictedstresspaths,thi
6、sstudyexplainsthenatureofthesetwofailuremodes,asexperiencedatWinstonLakeMine.Excellentcorrespondencebetweenmeasuredandpredictedstressesisachievedforboththehangingwallandthebackofthesilldrifts.Modelledstressrotationsinthehangingwallfollowcloselythestressrotationsdeterminedinthefiel
7、d,exceptattheendofthemonitoringcampaignwhenthestresscellswereaffectedbyinelasticstrainingofthehostrock.Thesemeasurementsassistinunderstandingthefailureprocessesandindefiningthelimitationsoftheadoptednumericalmodels.#2001ElsevierScienceLtd.Allrightsreserved.1.Introductionchangesthes
8、upportcapacityoffrictionalsupportcompone
