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BureauofMinesInformationCircular11987CoalMineBumps:FiveCaseStudiesintheEasternUnitedStatesByAlanA.Campoli,CarlaA.Kertis,andClaudeA.GoodeUNITEDSTATESDEPARTMENTOFTHEINTERIORInformationCircular9149CoalMineBumps:FiveCaseStudiesintheEasternUnitedStatesByAlanA.Campoli,CarlaA.Kertis,andClaudeA.GoodeUNITEDSTATESDEPARTMENTOFTHEINTERIORDonaldPaulHodel,SecretaryBUREAUOFMINESDavidS.Brown,ActingDirectorLibraryofCongressCataloging-in-PublicationDataCampoli,A.A.(AlanA.)Coalminebumps.(Informationcircular;9149)Bibliography:p.34.Supt.ofDocsnu:I'LS27:9149.1.Coalminesandrn~n~ng-UnitedStates-Accidents.2.Rockbursts.I.Kertis,CarlaA.11.Goode,ClaudeA.111.Title.IV.Series:Informationcircular(UnitedStates.BureauofMines);9149.PageAbstract....................................1Introduction................................2Acknowledgments...........................2...........Pillarloadingandbumpmechanisms2Casestudies................................5Mine1...................................5.................Stratigraphicrelationships5Structuralsettingandoverburdenthickness..5Bumpoccurrence.........................5Mine2...................................13Stratigraphicrelationships.................13Structuralsettingandoverburdenthickness..14Bumpoccurrence.........................17Mine3...................................19.................Stratigraphicrelationships19Structuralsettingandoverburdenthickness..Bumpoccurrence.................................................LongwallminingRoom-and-pillarmining............:........................................Mine4Stratigraphicrelationships.................Structuralsettingandoverburdenthickness..Bumpoccurrence.........................Mine5...................................Stratigraphicrelationships.................Structuralsettingandoverburdenthickness..Bumpoccurrence.........................Conclusionsandrecommendations..............References..................................Page2022222324242428292930303434ILLUSTRATIONS1.Adjustmentofstressaroundasingleentry......................................................32.Adjustmentofstressaroundawidepillar.......................................................33.Adjustmentofstressaroundanarrowpillar.....................................................44.Adjustmentofstressduetotheyieldingofanarrowpillar.........................................45.Idealizeddiagramofcoreconfinementloadingofacriticalsizepillar................................46.Generalizedstratigraphiccolumnformine1.....................................................57.SandstonethicknessmapofEckmanSandstone,whichimmediatelyoverliesPocahontasNo.4Coalbed,mine1..................................................................................68.Structurecontourmapformine1,drawnfromelevationoftopofPocahontasNo.4Coalbed............7...................................................................9.Overburdenmapformine1810.PlanviewofareaofbumpaccidentonOctober18,1983,mine1....................................9......................................11.Planviewofminingsequencepriortobumpaccident,mine11012.Idealizeddiagramofabutmentforcetransferinareaofbumpaccident,mine1........................1013.Locationofhydraulicloadcellsinrelationtoareaofbumpaccident,mine1..........................1114.Progressofminingmaps,forminingperiods1through6,ofhydraulicloadcellrea...