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1、英文原文NumericalsimulationofcoalseamjointsstiffnesseffectsoncoalbumpsYangdongjiangyixinzhaojiezhuChinaUniversityofMiningTechnology(beijing)BeijingPRC100083jiangyd@cumtb.yixin_zhao@chinazhujie@AbstractThenumericalapproachtot

2、ranslatycoalbumpsanalysisisusedtoexaminetheeffectsofjointcoalseamstiffnessontheoutburstvelocitydefmationmagnitudeoftheopeningwallplasticzonelengthinthecoalseam.Aseriesoftestsareperfmedbyvaryingthejointdipanglesspacingnma

3、ltojointtracksjointblocksizecoalseamstiffnessratiotothesurroundingrock.Resultsofjointcoalseamstiffnesseffectsanalysisindicatethatjointdipangleintervalspacingblocksizecoalseamstiffnessratiohaveprofoundinfluencesoncoalbump

4、s.Theincreasingofintervalspacingjointblocksizecangeneratelargerroadwaydefmationlowerroadwaydefmationvelocitylongerplasticregioninthecoalseam.Higherstiffnessratiocanalsoresultinlargerdefmationhigherdefmationvelocityofopen

5、ingwall.Coalbumpsconditionsdeteriateasthedipanglerotatedto90degreetheelasticzonesdisappearinthewholeactivezoneofcoalseamfdifferentspacingdistributions..Keywds:Coalbumpsnumericalsimulationjointtranslaty1、INTRODUCTIONUnder

6、groundcoalbumpsisoneofthecatastrophicminefailuresresultfromsuddenreleasesofenergy.Withtheenmousamountsofreleasedenergycoalbumpsmaycastseveraltonsofcoalmasopeningshizontallywhichalwaysresultindestructioncollapseofroadways

7、damageoffacilityevendeathinjurytotheminers.Thephenomenonofcoalbumpscanbefoundinvariouskinroadwayshape.Coalbumpsthrowsoutlargequantityofcoalfromthewallthentheroadwaywillbeclosedoverhundredsofmeters.Theresearchisfinanciall

8、ysupptedbyResearchFundftheDoctalProgramofHigherEducationundergrantNo.20030290001.Themininginducedseismicdetonationsotheractivitiesmaycausewavesunstablecrackpropagationinthecoalseamsurroundingrock.Thiswillcausedecreaseofn

9、malstressincreaseofshearingstresstotheinterfacesbetweenthecoalseamtheadjacentoverlyingunderlyingrocklayers.Theeffectsmayconvertthestickingfrictionintoaslidingfriction.Meoverattheactivezonesthecoalseamneartheexcavationwil

10、lbeanactiveplasticregion.Onlywhenthewholeactivezonesaretransferredtobeoneactiveplasticregionatsomeconditionthecoalbumpsaremelikelytooccur.OncethecoalbumpsoccurcoalatAzoneptionofBzonewilltranslatyejecttotheroadways.3、NUME

11、RICALSIMULATIONTECHNIQUE3.1NumericalModelingNumericalmodelingusingUDECversion3.0(ITA1996)hasbeencarriedoutfTangshancoalmineindertoinvestigatestabilityof12coalseamon14thlevel.Numericalmodelsweredevelopedfanalyzingtheeffec

12、tsofthreemainparametersofjointoncoalbumps.Thegeometryofthetwodimensional40m40mmodelstudiedisshowninFigure3.Accdingtotheminingdepthoverlyingstratasituationtheiginallithostaticstressof21Mpaisimposedonthetopboundaryofthemec

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