现有开采方法在矿井深部开采中应用的评估 毕业论文外文翻译

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1、翻译部分英文原文：PROSPECTSESTIMATIONOFKNOWNSYSTEMSAPPLICATIONFORCOALSEAMSMININGATGREATDERTHProf.w.p.ZubovLeningradMiningInstituteAbstract：Estimationofpresentandfuturesituationintechnologicalschemesoncoalminingatgreatdepthapplyinghighlyproductivemechanizedcomplexesispresentedhere,Sti

2、sshownthatthedecreasebothinoperationconcentrationandtheshareofpillarminingatdeepminesisconnectedwithincreasingdifficultiesindevelopmentworkingsupportbehindthefaceaswellaspreventionofroofcavinginfacearea.Introduction：UndergroundcoalminingefficiencydependsatIargeextentontechni

3、caleconomicindicesofdeepmines,theleveloftheirdevelopmentbeingsteadilyincreased.Intransitiontodeeperlevelsspecificexpendituresincreaseparallelwiththedeteriorationofgeologicalconditionsincoalseamsmining.AtminesofDonetskbasinwhereseamsareminedatadepthof500madmore,thedepthincrea

4、seforevery100mresultsinproductioncostto3-4%,herelabourproductivityofminersdecreasesin6-8%[1].Oneofthemaineffectivewaystoneutralizenegativedepthinfluenceonunder-roundcoalminingefficiencyistoincreaseaveragedailyfaceoutputonthebasisofusingcomplexmechanizationinstopping.Atnon-ga

5、ssyminestheapplicationoflongpillarminingleadstofaceoutputin1.2-1.65timescomparedtoaveragedailyfaceoutputinlongwallcombinedmethods.Evenmoreeffectiveappearedtobelongpillarmininginstoppingunderconditioncharacterizedbyincreasedgasemissioningoaf.Ingassyminesthefaceoutputisdetermi

6、nedtakingintoaccounttherequirementofmethanedilutionuptopermissibleconcentration,withmethaneemittingintoventilationcurrent.Inlongwallandcombinedmethodstheintakeairshouldenterthefacealongoneofthedevelopmentworkingsandthereturnairrunsalongtheotherdevelopmentworking.Maximumintak

7、eairquantitytothestopedependsonbothaircurrentveloclty,regulatedbysafesecurityrulesinworkingareaandcrosssectionareaofthefacewhichisfreeforaircurrentpassage.Thefactorsmentionedabovebeingofnon-regulatednature,ifbecomespracticallyimpossibletoincreasethequantityofintakeairtohepan

8、el.Accordingtothereasonsdiscussedatmineswithincreasedmethaneemissiontheactu