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1、InternationalJournalofCoalGeology71(2007)313–328www.elsevier.com/locate/ijcoalgeoThestabilityofmethanecaptureboreholesaroundalongwallcoalpanela,⁎aabbD.N.Whittles,I.S.Lowndes,S.W.Kingman,C.Yates,S.JoblingaNottinghamMiningandMineralsCentre,UniversityofNottingham,University
2、Park,Nottingham,NG72Rd,UKbUKCoalLtd.,HarworthPark,BlythRoad,Doncaster,DN118DBUKReceived9May2006;receivedinrevisedform19November2006;accepted22November2006Availableonline23January2007AbstractThispaperdescribestheapplicationofcomputationalmodellingtothepredictionofthestabi
3、lityofmethanedrainageboreholesduringtheextractionlifeofanactivelongwallcoalpanelwithinaUnitedKingdomcoalmine.Themodellingwasundertakentoinvestigatetheaffectsthatchangesintheroofgeologyandroadwaysupportsystemmayhaveonthedeformationandclosureofthegasdrainageboreholesdrille
4、dfromthetailgateacrossthegoafofanactivelongwallpanel.Thepaperalsooutlinesthedevelopmentofananalyticalmodeltoestimatethebendingdeformation,axialstrain,andtheruptureofboreholecasingduetorockshear.Thismodelwasusedinconjunctionwiththegeomechanicalstratamodelstopredictthedist
5、ancebehindthefacelineatwhichexcessiveboreholedeformationandclosurewouldoccur.Thismethodwasusedtoevaluatetheoptimumroadwaysupportsystemandspacingbetweenboreholestomaintaineffectiveboreholedrainagesubjecttotherangeofgeologicalconditionsencounteredduringthepanelretreat.Agoo
6、dcorrelationwasobtainedbetweenthemodelpredictionsandthegeomechanicalandgasdrainagedatameasuredataUKColliery.©2006ElsevierB.V.Allrightsreserved.Keywords:Longwallgeomechanics;Computationalmodelling;Methanedrainage;Boreholestability;Coalmeasurestrata1.Introductionmineperson
7、nelandleadtodowntimeandlossofproduction.ThemaximummethaneflowsintotheDuringtheminingofalongwallcoalpaneltherockworkingsfromthesurroundingrockstrataareobservedstrataaboveandbelowthepanelaredisturbedbythetooccurwithinafewmetresbehindthecoalfaceline.miningactivity(PengandCh
8、iang,1984).Thesedistur-However,significantmethaneflowshavebeenrecordedbancescanresultinthereleaseofmeth
