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2020 Vol. 5, No. 2

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Vulnerability evaluation of water inrush in coal seam floor based on zone variable weight and AHP
ZhangJunjie, LiuShouqiang, JiRunqing, ZengYifan, LiuXiangyu
2020, 5(2): 131-139.
Abstract(494) PDF(118)
Abstract:
Thetraditionalvulnerabilityassessmentofwaterinrushfromcoalseamflooroftenobtainsthe constantweightofeachinfluencefactorthroughdifferentmodelsandcalculationmethods.Whenevaluating,eachsubareaadoptsthisfixedweight,ignoringthefactthattheindexvaluesofeachinfluencefactorindifferentsubareasareindifferentcombinations,andtheinfluenceweightshouldbeadjustedaccordinglytoreflecttherelativeimportanceofeachinfluencefactorinwaterinrushfromcoalseamfloor inrealtime.Inthispaper,combinedwiththeconstantweightsoftheinfluencefactorsdeterminedby AHP,thezoningvariableweightmodelisintroducedtoadjusttheweightdistributionofdifferentzones underdifferentcombinationsoffactors,whichimprovestheirrationalityofconstantweightsindifferent zoningevaluation,furtherimprovestheaccuracyofevaluationresults,andprovidessomereferencefor thesafeproductionofcoalmines.
Geochemical characteristics and mining prospects of REE in Lugou coal mine of Xinmi coalfield
LuoZhonggeng, LiChunhui, WangShikui, LiangHandong
2020, 5(2): 140-149.
Abstract(502) PDF(80)
Abstract:
Thecontentofrareearthelementsandtheiroccurrencecharacteristicsunderlowtemperature ashingconditionsinLugoucoalmineofXinmicoalfieldwerestudiedbyXRD,XRFandICP-MSanalysistechniques.Theresultsshowthatthetotalcontentofrareearthelements(REE)inNo.1coalseam ofLugoucoalmineis21.85~287.62μg/g,withameanvalueof96.20μg/g.Therareearthelements inthecoalseamshowobviouslightrareearthenrichmentandheavyrareearthloss,whichismainlyderivedfromterrigenousclastics.Thecontentofrareearthelementsincoalisrelatedtothecontentofclay mineralsincoal,anditismostcloselyrelatedtothecontentofillite.Althoughthetectonicmovementof theMesozoicandCenozoicdestroysthestructureofcoalseams,ithasnoobviowseffectonthecontent anddistributioncharacteristicsrareearthelementsincoal.Thecontentofrareearthelementsinsome stratificationhassatisfiedtherequirementsofindustrialmining,andhascertaindevelopmentandutilizationvalue.
Brazilian disc splitting tests and numerical simulations on coal samples containing bedding planes
LiDejian, QiHao, LiChunxiao, FengJili
2020, 5(2): 150-159.
Abstract(557) PDF(105)
Abstract:
Inthispaper,Braziliandiscsplittingtestsoncoalrockspecimenswithbeddingplanesand correspondingsimulationsbycombinedfinite/discretenumericalmethod(FDEM)werecarriedout.The resultsshowthattheangleofbeddingplanehaveasignificantinfluenceonfracturepatternandtensile strengthofcoal.Itisclearthatastheangleofweakplaneincreases,thefracturepatternofmodelscan beclassifiedintofourtypes,includingstretchingfailureperpendiculartoweakbeddingplanes,complicatedsketchingandshearmixedpattern,shearfailurealongthebeddingplanes,andsketchingdamage alongweakbeddingplanes.Asforthedifferenceoftensilestrengthvalues,itisobservedthatwhenthe loadisperpendiculartothebeddingplane,theeffectofbeddingstructureoncalculatingtensilestrength isnegligibleandthetensilestrengthvaluedecreaseswiththeanglerisinguptotheminimumvalueas anglereachesvertical.Inaddition,withrespecttodissipatedenergyofcoalsamples,itisconcludedthat thedissipatedenergygraduallydecreaseswhentheangleofbeddingplanesareincreased,whichhavea relationshipwithvariedfracturepatternsandstrengthvalues.
Deformation and failure law of coal roadway supported by concrete filled steel tube supports in Nanguan mine
KongXiangsong, ShanRenliang, XiaoYuhang, BaoTiantian, YuanHonghu
2020, 5(2): 160-168.
Abstract(589) PDF(70)
Abstract:
TakingthecoalroadwayinNanguanmineofFenximiningareaastheprototype,relyingon thenestedsimilaritysimulationexperimentalsystem,thephysicalsimilaritymodelwasestablishedto studythestressdistribution,displacementanddeformationfailurecharacteristicsofthesurroundingrock ofcoalroadwaysupportedbyconcretefilledsteeltubesupport.FLAC3D5.0softwarewasusedtoestablishthecalculationmodelofconcretefilledsteeltubesupportroadway,whichsimulatedthedepthof 100mto1000mrespectively;thedeformationandfailurelawofcoalroadwayandthecharacteristicsof supportstresswereanalyzed.Theresultsshowedthat,concrete-filledsteeltubesupportcanimprovethe radialsupportpressureofroadway.Attheinitialstageofloading,thestabilityofroadwayismaintained, however,with the increase of load,the convergence of sidewall is greater than that of roof and floor.Fissuresfirstappearinthesidewallanddeveloptotheroofandfloor,thenthesidewallandthe roofareunstablesuccessively.Itcanbeseenthatthesidewallistheweaklinkofsupport.Undertheactionofconcretefilledsteeltubesupport,thestressdistributionontheroadwaysurfaceisserrated,which indicatesthatthesupporthasaneffectivesupportrangeforsurroundingrock,andthesupportbetween thesupportsisalsotheweakpartofthesupport.Theaxialforceandmomentofthesupportcasingare larger,andthecasingiseasytobedamaged,whichleadstothelossofthebearingcapacityofthesupport.ItcanbeseenthatthekeytoensurethestabilityofconcretefilledsteeltubesupportinNanguan mineistocontrolthedeformationandfailureofsidewallandsupportcasingandtoimproveitsstrength.
Research on the roof structure evolution and control technology of gob-side entry retaining with cutting the roof in steeply dipping seam
ZhangLi, ZhaoJing, WangShuanlin
2020, 5(2): 169-178.
Abstract(651) PDF(69)
Abstract:
Theapplicationofgob-sideentryretaining(GER)insteeplydippingseamwithhardroofhas alwaysbeenadifficultproblem.Basedonthecharacteristicsofgangueslideaccumulationingobwith steeplydippingseam,aimatmakefulluseoftheselfbearingcapacityofthegangue,thetechnologyof thegob-sideentryretainingwithroofcutting(GERRC) insteeplydippingseamisproposed.Through thetheoreticalanalysisandnumericalsimulation,theroofstructuresandsurroundingrockstressesofthe GERRCandthetraditionalGERwerecompared.AccordingtothestabilityanddeformationcharacteristicsofroofindifferentstagesofGEERC,thecuttingangleandsupportingtechnologywereoptimized, andfieldtestswerecarriedout.Thisresearchfindsthat,whentheroofstructureoftheGERRCisina staticallyindeterminatestate,itismorefavorableforroadwaystability.Thestabilityofthesurrounding rockinthedynamicsectionistheworst.Roadwaystrengtheningsupportandblockingganguesupport can be coordinated with the roof deformation.The field tests were successful.The cumulative deformationoftheroofandflooris177mm.Thesupportingresistanceofpillarsislessthan28MPa withoutobviousbendingpillars.
Analysis of surface transient charge and the interdependent response of microseismic signal during the deformation of coal
LiJing, GuanCheng, WangZhen, LiChengwu
2020, 5(2): 179-186.
Abstract(388) PDF(65)
Abstract:
Thestresschanges,transientchargesandmicroseismicsignalsofbriquettesamplesduring uniaxialcompressionfailureweremonitoredandanalyzedbyusingtheself-madeexperimentalsystem formeasuringtransientchargesandmicroseismicsignalsonthesurfaceofbriquette.Theexperimental resultsshowthatthesurfaceofbriquettesamplewillproducetransientchargeduringuniaxialcompression failure,and the charge signal changes instantaneously and monopulse,and lasts for a long time,about5~12s.However,themicroseismicsignalsshowobviousparoxysmaloccurrencewithashort durationofabout0.2~0.4s.Surfacetransientchargesandmicroseismicsignalsarestronglycorrelated withstresschanges,andtheiroveralltrendofchangehasahighsynchronizationintimescale.Thetime differencebetweenthepeakvaluesofthetwosignalsisabout0.08~0.5s.Thereisacriticalpointof energyrelease in the process of sample failure,which corresponds to the time of sudden stress change.Byusingthetimescaleconsistencyofsurfacetransientchargeandmicroseismicsignalandthe characteristicsofthecriticalpointofenergyrelease,theprocessofcoalandrockmassfailurecanbe predictedandanalyzedmoreaccurately.
Optimization of mining sequence in the fault-subsiding area of Heidaigou open-pit mine
ZhaoHongze, LiZhiwei, SunJiandong, ZhangZhao, GuoXinling, ZhangShanzhi, MaMingdong
2020, 5(2): 187-193.
Abstract(442) PDF(67)
Abstract:
Theminingsequenceaffectsthesafeandefficientproductionofminesandthedevelopment andeconomicbenefitsofminingenterprises.Inordertosolvetheproblemofminingsequenceduring thefault-subsidingareaofHeidaigouopen-pitmine,threeminingmethodsareproposedbasedonthe coalandrockoccurrenceconditions,mineproductionstatusandequipmenttypes.Theevaluationindicatorsrelatedtotheprogramfromtheaspectsofeconomy,technologyandsafetyandusedthethree-dimensionalmodelingandsimulatedminingtechnology,qualitativeandquantitativecombinationtodeterminethevaluesofeachparameter.Finally,TheAHP-idealpointmethodwasusedtoestablishacomprehensiveevaluationindexsystemmodeltodeterminetheoptimalminingplan.
Study on path planning and tracking of the underground mining road-header
QuYuanyuan, SongLinke, JiXiaodong, WuMiao
2020, 5(2): 194-202.
Abstract(664) PDF(109)
Abstract:
Accordingtotheworkingcharacteristicsoftheundergroundroad-header,pathplanningand movementsschedulingforpathcorrectionoftheroad-headerisformulated.Thepositionandorientation errorsoftheroad-headerduringworkingarealsopresentedbasedonitskinematicmodel.Takingthe workingspeedandturningangularspeedascontrolinputs,thecontrollawisdesignedandsimplifiedto ensurethe convergence of position and orientation errors based on the theory of sliding mode control.ThestabilityoftheproposedcontrolsystemisprovedbyusingtheprincipleofLyapunov.Thecorrespondingsimulationsshowthatthedesignedtrackingcontrolenablestheroad-headertocomebackto theaimedpathwithinlimitedadjustingsteps,Thewholeschedulingschemeintroducedforpathcorrectionisreasonableandfeasible,andcanprovideapositivefoundationforfurtherstudyofautomaticmininginthecoalindustry.
A kind of stability analysis method for the resonant accelerometer
LiYan, ZengHaoxuan, ZhangShuaiyin, ZhuZhouyu, ZhouXun, ZhouZiqiang
2020, 5(2): 203-208.
Abstract(839) PDF(138)
Abstract:
Thevibrationstabilityisoneoftheimportantperformancesofresonantaccelerometer,which hasanimportantimpactonmeasurementaccuracyandreliability.Inthispaper,thesensitivestructure vibrationstabilityoftheresonantaccelerometeristakenastheresearchobject,andtheinfluenceof structuralparametersontheresonantbeamvibrationstabilityisstudied.Firstofall,thesensitivemechanismofresonantaccelerometerisanalyzed,andthedynamicmathematicalmodelofresonantbeamis constructed.Thenthegeneralapproximatesolutionofthevibrationbeamdynamicmathematicalmodelis solvedbythemeansofsmallparameterperturbation,whichprovidesatheoreticalbasisfortheresonant beamvibrationstability.Intheconditionoftwotypicalaxialforces,thetransitioncurveofstabilityrange forthedynamicmathematicalmodelisobtained,whichmakesitpossibleforaquantitativeanalysisof thecorresponding relationship between the resonant beam vibration stability and the accelerometer structuralparameters.Finally,accordingtotheconclusionofstabilityanalysis,the1g staticrollingtest isperformedontheaccelerometer.Theresearchresultsshowthatstabilityanalysisprovideseffective theoreticalfoundationforoptimizingtheaccelerometerstructuralparameters.
Comparative study of domestic and foreign emission standards for volatile organic compounds
ZhuTao, ZhuXiaojing, NiuWenfeng, YuYang, RenXing, LinJun
2020, 5(2): 209-218.
Abstract(515) PDF(183)
Abstract:
AirpollutionisaseriousprobleminChina,andthecontrolmeasuresareincomplete.Byconductingacomparativestudyofdomesticandforeignemissionstandardsofvolatileorganiccompounds (VOCs)andlearningthecontentofforeignstandards,wecanprovideideasforChina*senvironmental management and reduce the harm of VOCs to human health and ecological environment via strengtheningmanagementandcontrol.Throughacomparativeresearchonthedefinition,hazardattributes,controlmeasuresandotheraspectsofVOCsbetweenChinaanddevelopedcountries,severalsuggestionsareputforwardforthemanagementandcontrolofVOCsinChina:strengtheningtop-leveldesign;scientificscreeningtoincreaseindustrialpollutioncontrol;establishingrefinedstandardsystem; implementing risk management; considering photochemical reaction and harmful properties, strengtheningsourceprevention.
Characteristics of water soluble inorganic ions in PM2.5 in winter of Beijing in typical urban areas
ShiYunyun, YangOu, YangQiaowen, LiangHandong, MaYongwei
2020, 5(2): 219-231.
Abstract(544) PDF(71)
Abstract:
Inordertofullyunderstandtheinorganicwater-solubleionsandtheirsourcesintheatmosphericfineparticlesPM2.5inBeijingaftercoal-to-gasconversion,41PM2.5 sampleswerecontinuously collectedinHaidianDistrictofBeijingduringthewinterheatingperiodin2017.Theconcentrationsof 10kindsofwater-solubleions(Na+,NH4+,K+,Ca2+,Mg2+,F-,Cl-,NO2-,NO3-,SO42-)wereanalyzed byionchromatography.TheresultsshowthatthedailyaveragemassconcentrationofPM2.5 inBeijing duringthesamplingperiodis(94.28±52.49)μg/m3.Comparedwiththewinterof2016,theaverage dailyPM2.5concentrationinBeijingin2017decreasedby29μg/m3,withadecreaseof28.2%,and thenumber of pollution days decreased significantly.During the pollution period,NO3-,SO42-,and NH4+intheparticulatematterweresignificantlyhigherthanthecleanperiod.Theratiooftheconcentrationofρ(NO3-)/ρ(SO42-) isgreaterthan1,andthecontributionofthemobilesourceisrelatively large,reflectingthattheimplementationofthe“coaltogas”policyhascontributedtothereductionof sulfateemissionsfromfixedsourcessuchascoal.Time-of-flightsecondaryionmassspectrometry(TOFSIMS)wascombinedwithmasshighresolutionmodeandpositiveandnegativeionimagingmodeto characterizePM2.5.TheresultsshowthatNH4+tendstoexistintheformofmolecularammoniumsulfate orammoniumhydrogensulfateduringthepollutionperiod.
Coking wastewater treatment technology and its bacterial community structure and function in sludge
ZhangYiming, ZhangYuxiu, ZuDebiao, LiTing
2020, 5(2): 232-241.
Abstract(593) PDF(126)
Abstract:
Cokingwastewaterisatypicalrefractoryindustrialwastewaterwithhighorganicload.Theincreasingly stringent effluent discharge standards have posed great challenges to traditional coking wastewatertreatmentprocesses.Cokingwastewatertreatmentsystemistypicallyacombinationofpretreatment,biologicaltreatmentandadvancedtreatment.Therein,biologicaltreatment,asthemainbody andthekeysegmentofthewholesystem,hastheadvantagesoflowcostandnosecondarypollution,and playsanimportantroleintheremovalofrefractoryorganicmatter.However,thebiologicalprocessesare generallyconfrontedwiththeproblemsoflowefficiencyandunstableoperationduetotheextremelylow biodegradabilityandlargefluctuationofcokingwastewaterquality.Inviewoftheseproblems,thispaper mainlyreviewstheanalysistechniquesofcokingwastewaterqualityaswellasvariouspretreatment,biologicaltreatmentandadvancedtreatmenttechnologies.Inparticular,themicrobialconsortiumstructure
andfunctionofdegrading-bacteriaofpollutantinthebio-treatmentsectionaresummarized.Thevarious emergingwatertreatmenttechnologiesareprospected.Alltheseresultsprovideatheoreticalbasisforthe optimizationofcokingwastewatertreatmenttechnologyanddevelopmentofthenewtechnologyinthefuture.
Discussion of smart tourism city construction schematization based on“five vertical-five horizontal” frameworks
TanKai, ZhuMeiguang, GuoHengliang
2020, 5(2): 242-248.
Abstract(481) PDF(125)
Abstract:
Basedontheanalysisofsmarttourismdevelopment,theconstructionofafivevertical-five horizontalframeworktosolvetheproblemininfrastructureconstruction,publicserviceplatformandsystemdevelopmentinsmarttourismcityconstructionisproposed.Fiveverticalincludestechnology,standard,security,policy,maintenanceandoperation,whilefivehorizontalincludesinfrastructurelayer,resourcelayer,applicationsupportlayer,applicationlayeranddecisionlayer,whichprovidestheoretical supportandpracticalreferenceforsmarttourismcityconstructioninChina.

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