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,Stissho

2、wnthatthedecreasebothinoperationconcentrationandtheshareofpillarminingatdeepminesisconnectedwithincreasingdifficultiesindevelopmentworkingsupportbehindthefaceaswellaspreventionofroofcavinginfacearea.Introduction：Undergroundcoalminingefficiencydependsatlargeextentontechnicalecono

3、micindicesofdeepmines,theleveloftheirdevelopmentbeingsteadilyincreased.Intransitiontodeeperlevelsspecificexpendituresincreaseparallelwiththedeteriorationofgeologicalconditionsincoalseamsmining.AtminesofDonetskbasinwhereseamsareminedatadepthof500madmore,thedepthincreaseforevery10

4、0mresultsinproductioncostto3-4%,herelabourproductivityofminersdecreasesin6-8%[l].Oneofthemaineffectivewaystoneutralizenegativedepthinfluenceonunder-roundcoalminingefficiencyistoincreaseaveragedailyfaceoutputonthebasisofusingcomplexmechanizationinstopping.Atnon-gassyminestheappli

5、cationoflongpillarminingleadstofaceoutputin1.2-1.65timescomparedtoaveragedailyfaceoutputinlongwallcombinedmethods.Evenmoreeffectiveappearedtobelongpillarmininginstoppingunderconditioncharacterizedbyincreasedgasemissioningoaf.Ingassyminesthefaceoutputisdeterminedtakingintoaccount

6、therequirementofmethanedilutionuptopermissibleconcentration,withmethaneemittingintoventilationcurrent.Inlongwallandcombinedmethodstheintakeairshouldenterthefacealongoneofthedevelopmentworkingsandthereturnairrunsalongtheotherdevelopmentworking.Maximumintakeairquantitytothestopede

7、pendsonbothaircurrentvelocity,regulatedbysafesecurityrulesinworkingareaandcrosssectionareaofthefacewhichisfreeforaircurrentpassage.Thefactorsmentionedabovebeingofnon-regulatednature,ifbecomespracticallyimpossibletoincreasethequantityofintakeairtohepanel.Accordingtothereasonsdisc

8、ussedatmineswithincreasedmethaneemissiontheactu