近距离上保护层开采最小安全岩柱厚度研究

20520105ChinaSafetyScienceJournalVol.20No.5May20103(,454000):6202740():X936:A:(50534070);(2008ZX05040-005),,,FLAC,,,,,;;;;ResearchontheMinimumThicknessofSecurityPillarduringtheMiningforShort2rangeUpwardProtectiveLayerYUANDong2sheng,Prof.JINGGuo2xun,Prof.ZHANGZi2min,Prof.(SchoolofSafetyScience&Engineering,HenanPolytechnicUniversity,Jiaozuo454000,China)Abstract:Theruleofstressdistributionaroundtherectangularroadwayandthemethodfordeterminingtheplasticzoneofroadwaywerestudied.Withtheminingconditionsoftheprotectiveseamsofthe5thcoalmineofPingdingshanGroupofCoalIndustryasanexample,andbyusingFLACnumericalcalculationprogram,anumericalsimulationwasconductedonthestressanddisplacementoftheprotectiveseamfloorundertheconditionofdifferentrockpillarsduringtheminingofshort2rangeupwardprotectivelayer.Basedonit,themethodforrationallydeterminingthethicknessofsecuritypillarswasproposed.Fieldobserva2tionshowsthatthetheoreticalcalculationsagreewellwiththenumericalresultsandproductionpractice.Keywords:protectivelayer;protectedseam;securitypillar;gasoutburst;plasticzone0,,,,,,,,,,,,,,,-,1617,15,151617,,,,,,3:1003-3033(2010)05-0023-06;:2010-01-10;:2010-04-30,,,FLAC,,,,,,,,11.1,,,,,,,,,,,,,,,,,,,,,,,,,,,,11.2(),,1,,[1](=1/31),222,:1),,,q2)0,,,p3)0,,,q4),,,p5),,,68m1.3:,,;[1],,:,42ChinaSafetyScienceJournal2020102a,2b,r=(a2+b2)1/2,33R=rp0p0sin+Ccos(1)()h=R-b,R,m;r,m;,();P0(H),MPa,,,N/m3;H,m;C,MPa1.4151.4.1,6.5km,4.8km,31.4km2,195612,195812,120t,1984,;151617,19911617,3,,1.4.2,,-450-650m,+165+335m,615985m,15161715-23220,1617-23220,720m,200m,15,34.6t1617-23220,98.5t4,5,(m)615-23220-530-620m,+260+464m,1.5m,8,15161738m,1617,,15-23220525:,,,,,,2.0m,0.5m,,,1617,,,,15-23220[2],,()4552:;,,,,,[4],,,,1.4.315:,15,,,11/GPa/GPa/()/MPa3.450.79180.150.256.423.28350.350.258.864.57400.50.237.233.65400.40.234.511.73250.20.282a,2b(),a=2m,bmax=1.9m,r=(a2+b2)1/2=2.7586m(1)R=3.6016m,()hmax=R-bmin=2.016m:,[3-5]151.5m,16173.5m,6,,1,X,Z,Y,,20m,520m,15m,16m15m,0.5m,30,8m,1m,XYZ=44m30m34m,45942,42180,7-,3,,21.65MPa22.125MPa(885m),0.8,17.72MPa,77,1262ChinaSafetyScienceJournal202010,2.0MPa2.5m2.0m,1.5m,1.0m,4,811,,,2MPa,1m,,,2.5m,(,,,),,1m,3MPa,[6],,2.5m,[7-8],,,2.5m22.1,,[9],,[10](12),10mm,10mm122.22006729,15-23220468m,675mm,=37,3.5m,163.5m,172.0m,700mm,10m116,1617;2170.5m,161760m,13141314,15-232201628m,,,10m,0.224%,,[11-12],725:151617(1.8m),,1516172m,,,,,,2.5m31),,,,,2),,,2.5m[1].()[D].:[],2008.[2],,,.[J].,2008,29(1):177-181.[3]Spencer,S.J.,Somers,M.L.,Pinczewski,W.V.,Doig,I.D.,U.ofNewSouthWales.Numericalsimulationofgasdrainagefromcoalseams[A].SPEAnnualTechnicalConferenceandExhibition[C],1987.9:217-229.[4],,,.[J].,2002,12(2):19-23.[5],.[J].,2004,14(1)93-96.[6].[D].:[],2003.[7],.[M].:,1991.[8]AireyE.M.Gasemissionsfrombrokencoal:anexperimentalandtheoreticalinvestigation[J].InternationalJournalofRockMechanicsandMiningSciences&GeomechanicsAbstracts,1968,5(6):475-494.[9].[M].:,1979.[10].[M].:,1986.[11],.[J].,1997(3):210-212.[12],.O[J].,1998,23(5):466-469.(1968-),,,,,,E2mail:[e-mail].82ChinaSafetyScienceJournal202010