振动放顶煤技术原理与实践

271Vol.27No.120081ChineseJournalofRockMechanicsandEngineeringJan.20082007031820070531(5053403050434020)(1955)[e-mail]1233(1.0300242.2210083.046204)5a0.65m1.0Hz5209200kN0.81.0Hz63%TD82A10006915(2008)01018706TECHNICALPRINCIPLEOFTOP-COALCAVINGWITHVIBRATIONANDITSPRACTICEZHAOYangsheng1XIEYaoshe2GUOJingang3HUOLingjun3(1.InstituteofMiningTechnologyTaiyuanUniversityofTechnologyTaiyuanShanxi030024China2.SchoolofMiningandSafetyEngineeringChinaUniversityofMiningandTechnologyXuzhouJiangsu221008China3.Lu′anMiningCo.Ltd.XiangyuanShanxi046204China)AbstractLowrecoveryratiooftop-coalinthefully-mechanizedcoalminingisahottechnicalproblem.AseriesofinvestigationmethodsandresultsofmechanicaldesignlaboratoryexperimentsDEMnumericalsimulationandin-situpracticeofthevibrationtop-coalcavingaredescribed.Theexperimentalresultsdemonstratedthatthevibrationeffectrangecanreach0.65mfarfromtheroofofminingspaceanditisalsofoundthatvibrationfrequency1.0Hzistheoptimumchoice.Thenumericalsimulationresultsillustratedthatthetopcoalcouldbecavedlayerbylayerwiththeeffectofverticalweightyandhorizontalvibrationforcesworkingtogether.Consequentlythewastestoneratioinminedcoalwasdecreasedandtherecoveryratiooftopcoalwasincreased.Theresultsof6monthsin-situpracticeinWangzhuangmineLu′anCoalIndustryCompanydemonstratedthattherecoveryratiooftopcoalwasincreasedby3%inaveragewiththevibrationmechanism.Thesystematicalinvestigationshavedemonstratedthatthevibrationtop-coalcavingisanadvantageousandprofitabletechniquewhichcangreatlyincreasetherecoveryoftop-coalanddecreasethewastestoneratio.Keywordsminingengineeringblock-fracturedtop-coalvibrationexperimentalstudynumericalsimulationin-situpractice•188•2008145%45%198210a[19](1987)(4309)300mm1/31999[1011]20006a[4]22.12PLC2111000t3.0m1.2m2.0m(1)2.0m2.0m1.2m200kN25MPa50mm1.2m0.8m32L/min25MPa22kW1Fig.1Testmachinefortopcoalcavingwithvibration2.20.21.6Hz0.2HzP=152025MPa212.3(1)271.•189•1Table1Sizedistributionoftestingrockblock/mm/%20015200300403004002040050010500600152022Table2Experimentalresultsoftop-coalarchingsizevs.structureofnaturaltop-coalcaving//mm200302224200250200270200302193350200150200302213220450100380260180500300150200302203500250100331/345%45%315%41/320%1/30.20/0.45=0.4444%n=kp(1)npk(2)200600mm600mm/800mm=0.750.750.330.75(3)22120MPa1.0Hz0.65m1.0Hz3[1215]•190•20082Fig.2Relationshipcurvesofvibratingforcevibrationfrequencyvs.influencingareaofvibration1.0Hz9(1)(2)(3)(4)(5)(6)(7)(8)(9)33Fig.3Discreteelementmodelforvibrationcavingtopcoal(4)(5)44.15209820m230m6.8m295m1.492m0.900m0.230m200kN0.81.0Hz2113#114#45m4.22004363(1)300mm(1/3)59%(2)3%(3)9.3%(6)/MPa/cm271.•191•4Fig.4DEMnumericalsimulationofnaturaltop-coalcaving5Fig.5DEMnumericalsimulationofvibrationtop-coalcaving3(2004)Table3Coalsizevs.therecoveryrateoftop-coalinvibratingtopcoalcaving(in2004)//t/%/%/%300mm350mm500mm300mm()Y5.3094.66.46814.707420309N4.9087.519.62444.60171270.361Y5.0089.26.46814.707420310N5.2092.810.75824.4511830.590Y5.2593.76.19014.076420311N4.7084.114.9033.87131050.428Y5.2092.86.46814.707420312N4.8586.614.89433.85161140.419Y4.9087.57.66517.428620315N4.9087.519.33043.94161270.460Y5.1091.14.1209.375310316N5.1091.18.70019.7710720.470Y5.1592.04.1189.365310317N4.8686.815.18034.50141050.310Y4.8085.76.93015.757520318N4.6082.120.06045.60171370.378Y5.3295.03.8408.724310319N4.8887.112.06027.4011840.350Y5.0590.14.1209.365310322N5.1091.114.15032.1812950.350YN(a)105#(2004311)(b)121#(200439)(c)108#(2004311)•192•2008(d)103#(2004311)6Fig.6Archingstructuredrawingofvibrationandnon-vibrationtopcoalcaving511(1)0.65m1.0Hz(2)(3)5209200kN0.81.0Hz63%(4)(References)[1].[M].2001.(JINZhongming.Theoryandtechnologyontop-coalcaving[J].BeijingChinaCoalIndustryPublishingHouse2001.(inChinese))[2].[M].1994.(ZHAOYangsheng.Rock-fluidmechanicsinmining[M].BeijingChinaCoalIndustryPublishingHouse1994.(inChinese))[3].[M].2002.(GUOJingang.Theoryandtechnologyforincreasingthetop-coalrecoveryratio[M].BeijingChinaCoalIndustryPublishingHouse2002.(inChinese))[4].[][D].2006.(XIEYaoshe.Studyonthetheoryandtechnologyofthetop-coalcavingwithvibration[Ph.D.Thesis][D].XuzhouChinaUniversityofMiningTechnology2006.(inChinese))[5].[J].199924(3)3943.(SONGXuanminQIANMinggaoJINZhongming.Thelawdistributionofblockontop-coalcaving[J].JournalofChinaCoalSociety199924(3)3943.(inChinese))[6].[J].200429(3)47.(WANGJiachenLIZhigangCHENYajunetal.Experimentalstudyonloosemediumflowfieldonthelongwalltop-coalcaving[J].JournalofChinaCoalSociety200429(3)47.(inChinese))[7].[J].200126(6)606610.(FANYunce.Controlontopcoalcavinginlongwalltopcoalcavingworkingface[J].JournalofChinaCoalSociety200126(6)606610.(inChinese))[8].[J].200221(1)7072.(JINZhongmingGONGPeilinJINWenxue.Studyonthecharacteristicofcoalmassfracture[J].ChineseJournalofRockMechanicsandEngineering200221(1)7072.(inChinese))[9].[J].200025()4345.(JINZhongmingWEIJinpingJINWenxue.Researchonfractureevolutionlawofcoalmassinfullymechanizedface[J].JournalofChinaCoalSociety200025(Supp.)4345.(inChinese))[10].[M].1989.(GUDeshengWANGHuiyingLIDangxin.Vibrationminingtechno