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2019 Vol. 4, No. 5

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Element geochemical characteristics of Mesozoic mudstones in the northern piedmont zone of the Kuqa depression and their implications to sedimentary environments
LiangWanle1, LiXianqing1, 2, WeiQiang1, LiJin3
2019, 4(5): 375-383.
Abstract(354) PDF(93)
Abstract:
Bymeansofelementgeochemistry,thecharacteristicsofmajorelements,traceelementsand rareearthelements(REE)forTriassicandJurassicmudstonesfromthenorthernpiedmontzoneinthe Kuqadepressionwerestudiedanddiscussedfortheimplicationsfosedimentryenvironment.TheMesozoicmudstonesfromthenorthernpiedmontzoneintheKuqadepressionaredominentlyterrestrialfreshwatersedimentaryenvironments.REE arecharacterizedbyenrichmentoflightREE,andreflect the
sedimentarycharacteristicsofrapidaccumulationoforganicmatterandslowrechargeofterrigenousfine debris.FromtheTriassictotheJurassic,thepaleosalinityincreasedslightlywhilethepaleoclimatewas mainlyhumid,andthewholewasunderdysoxic-anoxicconditions.Thewarmandhumidpaleoclimate andlowerpaleosalinityduringthedepositionoftheHuangshanjieFormationareconducivetotheproductionoforganicmatterproductivity,andthedysoxic-anoxicconditionprovidespreservationconditions.Thehot-drypaleoclimateenvironmentbegantoappearintheperiodoftheQiakemakeFormation, andthehigherpaleosalinitymaypromotetheformationoforganicmatter,buttheanoxicconditionis moreconducivetoitspreservation.
LiuBo1, 2
2019, 4(5): 384-393.
Abstract(300) PDF(77)
Abstract:
Itisdifficulttoconsiderthechangeofsettlementalongwithtimebyusingstochasticmedium theoryinthesettlementpredictionprocessinsubwayconstruction. Anewsettlement-timemodelisproposed. Thismodelisbasedonnormallydistributedcumulativefunction. Apredictionmodelofthreedimensionalgroundsurfacesettlementconsideringtimeeffectinducedbysubwaytunnelingisbuiltup byusingstochasticmediumtheory. Thepredictionformulaeofgroundsurfacesettlementconsidering timeeffectinducedbysingletunnelandtwintunnelsarededuced. Thecomputingmethodofthree-dimensionalinclineandcurvatureofthegroundsurfacesettlementconsideringtimeeffectispresented. A casestudyofbackanalysisispresentedbasedontheDougezhuang-Heizhuanghusectiontunnelproject ofBeijingsubwayconstruction. Theresultsshowthat:Thetime-settlementmodelisclosetothemeasureddata,whichprovedthemodelisscientific;Themodelcanmakepredictionofthespatialdistributionandtimevariationofsettlement;Accordingbythepredictedsettlementsurface,wecancalculate
thethree-dimensionalinclineandcurvatureofthegroundsurfacesettlement,andobtainthedifferential settlementandshapeofthesurfacesettlementovertime.
Hybrid moment tensor inversion and numerical analysis of rock fracture
ZhangLingfan, ChenZhonghui, QinFan, NianGengqian, ChenHongjie
2019, 4(5): 394-402.
Abstract(531) PDF(76)
Abstract:
Throughindoorrockacousticemissiontest,thestudyofthespatio-temporalevolutioncharacteristicsofacousticemissionsignalsunderdifferentfractureconditionshascertainguidingsignificance formonitoringandearlywarningofrockengineering.Throughthetensileandsheartestsofrock,the temporalandspatialevolutioncharacteristicsofdifferenttypesofrockfracturewereanalyzedbyusing theGeigerlocationmethodandthehybridmomenttensortheory,andthenumericalsimulationsoftware RFPA2Dwasusedtoverifyit.Duringthetensilefailureofrock,thecrackinginitiatedatthemaximum bendingmomentandthetensioningsignalsourceisthemainsource.Duringtheshearfailure,therocks crackfirstlyinthemiddleofthemaincrackandappearthescatteredsourceoftensionsignal,butwith theincreaseoftheload,thesourceismajorlyshearsignal.
Research on damage viscoelastic dynamic constitutive model of granite
LingTianlong, LiuDianshu, LiangShufeng, LiShenglin
2019, 4(5): 403-409.
Abstract(489) PDF(189)
Abstract:
DynamicmechanicalpropertiesofgraniteweretestedbyasplitHopkinsonpressurebarsystemwithconstantstrainrate.Theinitialloadingstageofstress-straincurveofgraniteislinearelasticity, andtherockmaterialhasasignificantplasticdeformationafteryielding.Yieldstrength,peakstrength andelasticmodulusareallratedependent.Basedondynamicmechanicalpropertyofgranite,theconstitutiveofZhu-Wang-Tangmodelwassimplifiedto apply on granite,and with consideration of the effectofdamageonthedynamicstrengthofgraniteunderimpactload.Theexperimentaldatawerefitted totheproposedmodel.Thefittedstress-straincurvesatdifferentstrainratesareingoodagreementwith theexperimentalones.Thisdemonstratesthattheproposeddynamicconstitutivemodelinthispapercan accuratelydescribethedynamicmechanicalpropertiesofgraniteundertheimpactload.
Study on the pre-control of rock burst in the isolated island face of Tangshan mine
SunQiang1, WangQi2, YaoTengfei1, LiHuiliang2
2019, 4(5): 410-416.
Abstract(427) PDF(130)
Abstract:
Rockburstisoneofthedynamicdisastersthatseriouslythreatenedthesafetyofmineproduction.Thestressconcentrationintheisolatedworkingfaceanditsroadwayishigh,andthecharacteristicsoftheviolentroofmovementmakeitmoreeasytooccurrockburst.Inviewofthecharacteristicsof isolatedworkingfaceinTangshanCoalMine,firstly,thecomprehensiveindexmethodwasusedtodeterminethedangerousgradeofworkingfaceY484,andtheworkingfacewasdividedintosevenweak impactstrength,twomediumimpactstrengthandthreestrongimpactstrengthareas.Later,borehole stressgaugeandcross-pointmethodwereadoptedtodeterminethepeakpositionandinfluencerangeof supportpressureinthearea.Accordingtodifferentdangerousgradesofrockburst,thetechnologyof boreholepressurereliefandblastingpressurereliefwereusedtopre-controlrockburst.Theapplication studyshowsthatthecomprehensivepreventionandcontroltechnologyissafeandeffectiveforthepreventionandcontrolofworkingfaceY484
Study on deformation and failure characteristics of overlying strata with thick loose layers and thin bedrock based on Hoek-Brown criterion
LiQuansheng1, 2, XuZhuhe1, 3
2019, 4(5): 417-424.
Abstract(538) PDF(75)
Abstract:
ThemechanicsparametersofrockmassinWulanmulunminearedeterminedonthebasisof theexperimentaldatameasuredinthelaboratoryandappliedHoek-Browncriterioninthispaper.On thisbasis the failure characteristics of overlying strata caused by coal mining are studied through FLAC3Dsimulationsoftware.Theresearchresultsshowthat:①Theoverlyingstrataundershallowburial depth until surface has been destroyed, and the skewness subsidence basin is formed on the
surface.Themaximumsubsidenceis2.1m,andthesubsidencerateis0.6.②Thestress-relaxedarea andthestress-increasedareaareformedinacertainrangeofthesurroundingboundaryofthemining area.Thestatepresents“externaltightinternalloosing”.Thedegreeofverticalstressconcentrationin frontofcoalwallisthehighest,andthestressconcentrationfactoris2.2.Thereisapressurearchseparatelyabovethecoalwallandtheopen-offcut,butthespan,thesizeofthearchfootandthedegree ofstressconcentrationaredifferent.③Theheightofthecavingzoneis18.9m,andtheheightofwater flowingfracturedzoneis62.5mof12403faceinWulanmuluncoalmine.
Stability analysis and treatment of multi-stage left goaf group in Linglong mining area
WangBingwen1, XiongTingyong1, LeiQiang1, 2, ZhangYi1, XiaoHongchao1, LiuJie1, 3
2019, 4(5): 425-433.
Abstract(400) PDF(73)
Abstract:
Toeffectivelycontroltheundergroundgoafandrealizetheconstructiongoalofnotailings, thestabilityanalysisandtreatmentofthemulti-stageleftgoafgroupinLinglongminingareawerecarriedout.Firstly,thestabilityoftheroofwasanalyzedbyusingthefixedbeamtheory,thesimplysupportedbeamtheoryandtheloadtransferintersectionlinetheory,andthestabilityofthepillarwasanalyzed according to the area bearing theory and pillar strength formula.Then,the distribution of the stressanddisplacementofsurroundingrockingoafwerestudiedbyusingFLAC3Dsoftware.Finally,accordingtothetheoreticalanalysisandnumericalsimulationresults,theremainingspacegroupswere
dividedintothreegradesofstability,relativelystabilityandinstability,andthewholetailingscementationfillingtestwascarriedoutingoafG16,veinNo.47,veinNo.50andveinNo.47-1abandoned roadway.TheresultofresearchshowsthatgoafG9,G17andG26areinstablestate,whileseventeen goafssuchasG1,G2andG3areinarelativelystablestate.SixgoafssuchasG6,G7andG10arein aninstablestate.Theresultsofcementedfillingtestshowthatthebackfillhasgoodconsolidationeffect, andrealizetheundergroundsafedisposaloftailingsinmineralprocessing. Itisusefultocandesign reasonablemanagementplanaccordingtotheanalysisresultofgoafstability.
Prediction model of working face hypoxia based on improved generalized regression neural network
YangXiaobin, WangXiaoyao, ZhouShilu, ZhangZipeng
2019, 4(5): 434-440.
Abstract(393) PDF(133)
Abstract:
Inordertosolvetheproblemofworkingfacehypoxiaincoalminemoreeffectivelyandreasonably,animprovedgeneralneuralnetwork(GRNN)modelforpredictionofoxygenconcentrationin coalminewasconstructed,bytakingthemonitoringdataofaworkingfaceinShendongassamplesand consideringtheinteractionrelationshipbetweenphysicalparameters,basedonprincipalcomponentanalysis.Comparingthepredictedoxygenconcentrationresultswiththemeasureddata,itprovesthatthe improvedGRNN model has good fitting accuracy and generalization ability.By using the improved GRNNmodel,theoriginalGRNNmodelandBPneuralnetworkmodelrespectivelyinthecomparative analysisofhypoxiaproblems,itfoundthattheimprovedGRNNmodelhasbettereffectsandismore suitableforthepredictionofhypoxiaproblemsincoalmineface.Theinfluenceofinletairpressure, outletairpressureandinletairtemperatureontheoxygenconcentrationwereanalyzedbytheimproved GRNNmodel.ThisimprovedGRNNmodelcangiveareferencetohypoxiapredictionandhypoxiacontroltechnologyoftheworkingface.
The design of analysis and test platform for electromagnetic wave energy security
FengLiu1, GaoPengfei1, ZhangLiya2, WangWenqing3
2019, 4(5): 441-447.
Abstract(382) PDF(215)
Abstract:
Theundergroundmetalstructureintheradiationfieldoftheradiofrequencyantennacanbe equivalenttothereceivingantenna.Theenergyofelectromagneticwavefocusedonthemetalstructure willbereleasedintheformofdischargesparkunderscratchcondition.Atpresent,thereisnotesting methodandexperimentalequipmenttomeasurethedischargesparkcausedbyelectromagneticwaveenergy.Inordertosolvethisproblem,thispaperdevelopsatestingplatformforelectromagneticwaveenergysecurityanalysis.Accordingtothedifferentwaysofcouplingelectromagneticwaveenergytometal structure,theplatformdesignsthreekindsofdevices:radiationfield(RF)couplingenergytest,electromagneticwaveenergymagneticresonancecouplingpowertestandelectromagneticwaveenergydischarge spark experiment.On this basis,the spark power experiment of the RF signal source under scratchcondition was carried out.The experimental results show that when the output power of the signalsourceislessthan4.1W,thesparkcausedbytheenergyoftheRFelectromagneticwavewould
notignitethegas.
Research on indoor positioning algorithm based on location fingerprint and PDR
WuYaqin, YangShuo, ShiLanlan
2019, 4(5): 448-454.
Abstract(448) PDF(237)
Abstract:
To improve the indoor positioning accuracy, the methods of position fingerprint and pedestriandeadreckoning(PDR)areusedtostudytheindoorpositioningalgorithm.Forpositionfingerprintalgorithm,thefingerprintdatabaseisoptimizedthroughtheofflinedatatrainingphase,andthe optimizationofthenearestneighboralgorithmiscarriedoutbylimitingtheregionweightedvalue K throughtheonlinereal-timematchingphase.ForPDRalgorithm,theself-adaptationpeakdetectionalgorithmusedforstepfrequencydetectionisproposed.Theimprovednonlinearmodelisusedforstep sizeestimation.Moreover,Thegyroscope’sinformationarefusedtomagnetometer’sinformationinthe heading estimation.Finally, the unscented Kalman filter is used to fuse the position fingerprint algorithmandPDRmethod,whichimprovesthepositioningaccuracyandthepracticabilityofthefusion algorithmisverifiedbythepositioningsystem.
Application of polyferric sulfate in the preparation of ultra clean coal by selective agglomeration
DongZilong, YangQiaowen, ZhaoJianbing, DouMeng, FengYao
2019, 4(5): 455-460.
Abstract(427) PDF(158)
Abstract:
TheapplicationofpolyferricsulfateinthepreparationofUltraCleanCoalbyselectiveagglomerationwasinvestigated.TaixianthraciteinNingxiaastheresearchobject,theultrafinepulverized coalwasusedinthisstudy.Theeffectofthemilingtime,polymericferricsulphateandthemixtureof polyferricsulfateandpolyaluminiumchlorideonthecleanedcoalashcontentandyieldwerediscussed, furthermore,thebeneficiationeffectsofferricsulfateandpolyferricsulfatewerecompared.Theparticle sizeofcoalsampleswithdifferentmillingtimewasdeterminedbylaserparticlesizeanalyzer,andthe potentialvalueofcoalwithdifferentinorganicpolymerelectrolyteswasdeterminedbyZetapotentiometer.Theresultsshowthatpolyferricsulfateandferricsulfatehadapositiveeffectonthereductionof mineralcontentsincoal.Thebeneficiationeffectofpolyferricsulfateisbetterthanthatofferricsulfate
atlowdosage.Polyferricsulfateand29% polyaluminiumchlorideweremixedat1∶1,whenitsdosage was26.45g/tandthemillingtimewas30minutes,theashcontentofultracleancoalwas0.63% and thecleancoalyieldwas66.84%.Withtheincreaseofthedosageofpolyferricsulfate,theZetapotential decreasedfrom-21.40mVto-14.30mVfirstandthenincreasedto-25.40mV.Withtheincreaseof the mixing amount of polyferric sulfate and polyaluminium chloride,the Zeta potential increased from-23.83mVto-13.33mV.
Fracture dynamics analysis and experimental study on graded crushing process
ZhouQiang1, PanYongtai1, GuoQing1, ZhuChangyong2, WeiYinghua2, YangCheng2, ShenNing2
2019, 4(5): 461-467.
Abstract(404) PDF(124)
Abstract:
Therotationalspeedofthetoothedrollscrusherisakeyparameterforcontrollingtheparticle sizeofthecrushed product.At present,the determination of the rotational speed isin a qualitative stage.Thereisnocorrespondingtheorytoguide.BasedontheGrady-Kippdynamicfracturemodel,the relationshipbetweenloadingspeedandproductparticlesizeisanalyzed.The　 anthraciteandgangue crushedatdifferentloadingspeedswascarriedoutbydrophammertestmachine.Theresultsshowthat theaveragesizeofthetwomaterialsdecreaseswiththeincreaseofloadingspeedwithpowerlaw.The testresultsverifythecorrectnessofthefracturemodel,andprovideareferenceforthedeterminationof theloadingspeedoftoothedrollscrusher.

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