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1、英文原文NumericalsimulationofcoalseamjointsandstiffnesseffectsoncoalbumpsYangdongjiang,yixinzhao,jiezhuChinaUniversityofMiningandTechnology(beijing)AbstractThenumericalapproachtotranslatorycoalbumpsanalysisisusedtoexaminetheeffectsofjointandcoalseamstiffnessontheoutburstv
2、elocity,deformationmagnitudeoftheopeningwal1andplasticzone1engthinthecoalseam・Aseriesoftestsareperformedbyvaryingthejointdipangles,spacingnormaltojointtracks,jointblocksizeandcoalseamstiffnessratiotothesurroundingrock・Resultsofjointandcoalseamstiffnesseffectsanalysisi
3、ndicatethatjointdipangle,intervalspacing,blocksizeandcoalseamstiffnessratiohaveprofoundinfluencesoncoalbumps・Theincreasingofintervalspacingandjointblocksizecangeneratelargerroadwaydeformation,lowerroadwaydeformationvelocityandlongerplasticregioninthecoalseam・Highersti
4、ffnessratiocanalsoresultinlargerdeformation,higherdeformationvelocityofopeningwal1.Coalbumpsconditionsdeteriorateasthedipanglerotatedto90degreeortheelasticzonesdisappearinthewholeactivezoneofcoa1scamfordifferentspacingdistributions・・Keywords:Coalbumps,numericalsimulat
5、ion,joint,translatory1.INTRODUCTIONUndergroundcoalbumpsisoneofthecatastrophicminefailuresresultfromsuddenreleasesofenergy.Withtheenormousamountsofreleasedenergy,coalbumpsmaycastseveraltonsofcoalmasopenidestructionandcngshorizontally，whichalwaysresultinollapseofroadway
6、s,damageoffacilityevendeathandoverhundredsofmeters.injurytotheminers.Thephenomenonofcoalbumpscanbefoundinvariouskinroadwayshape-Coalbumpsthrowsoutlargequantityofcoalfromthewallandthentheroadwaywillbeclosed2.TheresearchisfinandailysupportedbyResearchFundfortheDoctoralP
7、rogramofHigherEducationundergrantNo.20030290001.3.MECHANISMOFCOALBUMPSGenerallyspeaking,coalbumpscanbeclassified(Rice,1935)intotwotypes:Oneispressurebumpswhicharecausedwhenstrongandbrittlecoalpillarsorportionsofpillarsandloadedbeyondtheirload-carryingcapacityresulting
8、insuddenandviolentfailure.Theotherisshockbumps,whichareattributedtorupturingofstrongstrataabovethecoalseam.[3〜4]Infact,mostc
