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1、英文原文NumericalsimulationofcoalseamjointsandstiffnesseffectsoncoalbumpsYangdongjiang,yixinzhao,jiezhuChinaUniversityofMiningandTechnology(beijing)Beijing,PRC100083jiangyd@cumtb.edu.cnyixin_zhao@sohu.comchinazhujie@163.comAbstractThenumericalapproachtotranslatorycoalbumpsanalysisi
2、susedtoexaminetheeffectsofjointandcoalseamstiffnessontheoutburstvelocity,deformationmagnitudeoftheopeningwallandplasticzonelengthinthecoalseam・Aseriesoftestsareperformedbyvaryingthejointdipangles,spacingnormaltojointtracks,jointblocksizeandcoalseamstiffnessratiotothesurrounding
3、rock.Resultsofjointandcoalseamstiffnesseffectsanalysisindicatethatjointdipangle,intervalspacing,blocksizeandcoalseamstiffnessratiohaveprofoundinfluencesoncoalbumps・Theincreasingofintervalspacingandjointblocksizecangeneratelargerroadwaydeformation,lowerroadwaydeformationvelocity
4、andlongerplasticregioninthecoalseam・Higherstiffnessratiocanalsoresultinlargerdeformation,higherdeformationvelocityofopeningwall.Coalbumpsconditionsdeteriorateasthedipanglerotatedto90degreeortheelasticzonesdisappearinthewholeactivezoneofcoalseamfordifferentspacingdistributions..
5、Keywords：Coalbumps,numericalsimulationJoint,translatory1、INTRODUCTIONUndergroundcoalbumpsisoneofthecatastrophicminefailuresresultfromsuddenreleasesofenergy.Withtheenormousamountsofreleasedenergy,coalbumpsmaycastseveraltonsofcoalmasopeningshorizontally,whichalwaysresultindestruc
6、tionandcollapseofroadways,damageoffacilityevendeathandinjurytotheminers.Thephenomenonofcoalbumpscanbefoundinvariouskinroadwayshape・Coalbumpsthrowsoutlargequantityofcoalfromthewallandthentheroadwaywillbeclosedoverhundredsofmeters.TheresearchisfinanciallysupportedbyResearchFundfo
7、rtheDoctoralProgramofHigherEducationundergrantNo.20030290001.2、MECHANISMOFCOALBUMPSGenerallyspeaking,coalbumpscanbeclassified(Rice,1935)intotwotypes:Oneispressurebumpswhicharecausedwhenstrongandbrittlecoalpillarsorportionsofpillarsandloadedbeyondtheirload・carryingcapacityresult
8、inginsuddenandviolentfailure.Theotherisshockbumps,whic
