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1、英文原文NumericalsimulationofcoalseamjointsandstiffnesseffectsoncoalbumpsYangdongjiang,yixinzhao,jiezhuChinaUniversityofMiningandTechnology(beijing)Beijing,PRC100083jiangyd@cumtb.edu.cnyixin_zhao@sohu.comchinazhujie@163.comAbstractThenumericalapproachtotranslatorycoalbumpsanalysisisusedtoexamin
2、etheeffectsofjointandcoalseamstiffnessontheoutburstvelocity,deformationmagnitudeoftheopeningwallandplasticzonelengthinthecoalseam.Aseriesoftestsareperformedbyvaryingthejointdipangles,spacingnormaltojointtracks,jointblocksizeandcoalseamstiffnessratiotothesurroundingrock.Resultsofjointandcoal
3、seamstiffnesseffectsanalysisindicatethatjointdipangle,intervalspacing,blocksizeandcoalseamstiffnessratiohaveprofoundinfluencesoncoalbumps.Theincreasingofintervalspacingandjointblocksizecangeneratelargerroadwaydeformation,lowerroadwaydeformationvelocityandlongerplasticregioninthecoalseam.Hig
4、herstiffnessratiocanalsoresultinlargerdeformation,higherdeformationvelocityofopeningwall.Coalbumpsconditionsdeteriorateasthedipanglerotatedto90degreeortheelasticzonesdisappearinthewholeactivezoneofcoalseamfordifferentspacingdistributions..Keywords:Coalbumps,numericalsimulation,joint,transla
5、tory1、INTRODUCTIONUndergroundcoalbumpsisoneofthecatastrophicminefailuresresultfromsuddenreleasesofenergy.Withtheenormousamountsofreleasedenergy,coalbumpsmaycastseveraltonsofcoalmasopeningshorizontally,whichalwaysresultindestructionandcollapseofroadways,damageoffacilityevendeathandinjurytoth
6、eminers.Thephenomenonofcoalbumpscanbefoundinvariouskinroadwayshape.Coalbumpsthrowsoutlargequantityofcoalfromthewallandthentheroadwaywillbeclosedoverhundredsofmeters.TheresearchisfinanciallysupportedbyResearchFundfortheDoctoralProgramofHigherEducationundergrantNo.20030290001.2、MECHANISMOFCOA
7、LBUMPSGenerallyspeaking,coalbumpscanbeclassified(Rice,1935)intotwotypes:Oneispressurebumpswhicharecausedwhenstrongandbrittlecoalpillarsorportionsofpillarsandloadedbeyondtheirload-carryingcapacityresultinginsuddenandviolentfailure.Theotherisshockbumps,whi
