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1、NumericalsimulationofcoalseamjointsandstiffnesseffectsoncoalbumpsYangdongjiang,yixinzhao,jiezhuChinaUniversityofMiningandTechnology(beijing)Beijing,PRC100083jiangyd@cumtb.edu.cnyixin_zhao@sohu.comchinazhujie@163.comAbstractThenumericalapproachtotranslatorycoalbumpsanalysisisusedtoexam
2、inetheeffectsofjointandcoalseamstiffnessontheoutburstvelocity,deformationmagnitudeoftheopeningwallandplasticzonelengthinthecoalseam.Aseriesoftestsareperformedbyvaryingthejointdipangles,spacingnormaltojointtracks,jointblocksizeandcoalseamstiffnessratiotothesurroundingrock.Resultsofjoin
3、tandcoalseamstiffnesseffectsanalysisindicatethatjointdipangle,intervalspacing,blocksizeandcoalseamstiffnessratiohaveprofoundinfluencesoncoalbumps.Theincreasingofintervalspacingandjointblocksizecangeneratelargerroadwaydeformation,lowerroadwaydeformationvelocityandlongerplasticregionint
4、hecoalseam.Higherstiffnessratiocanalsoresultinlargerdeformation,higherdeformationvelocityofopeningwall.Coalbumpsconditionsdeteriorateasthedipanglerotatedto90degreeortheelasticzonesdisappearinthewholeactivezoneofcoalseamfordifferentspacingdistributions..Keywords:Coalbumps,numericalsimu
5、lation,joint,translatory1、INTRODUCTIONUndergroundcoalbumpsisoneofthecatastrophicminefailuresresultfromsuddenreleasesofenergy.Withtheenormousamountsofreleasedenergy,coalbumpsmaycastseveraltonsofcoalmasopeningshorizontally,whichalwaysresultindestructionandcollapseofroadways,damageoffaci
6、lityevendeathandinjurytotheminers.Thephenomenonofcoalbumpscanbefoundinvariouskinroadwayshape.Coalbumpsthrowsoutlargequantityofcoalfromthewallandthentheroadwaywillbeclosedoverhundredsofmeters.TheresearchisfinanciallysupportedbyResearchFundfortheDoctoralProgramofHigherEducationundergran
7、tNo.20030290001.2、MECHANISMOFCOALBUMPSGenerallyspeaking,coalbumpscanbeclassified(Rice,1935)intotwotypes:Oneispressurebumpswhicharecausedwhenstrongandbrittlecoalpillarsorportionsofpillarsandloadedbeyondtheirload-carryingcapacityresultinginsuddenandviolentfailure.Theotherisshockbumps,wh
8、ichar