采矿英语1Word文档下载推荐.docx
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采矿英语1Word文档下载推荐.docx
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8.Itisimportantthatgravitybeusedasmuchaspossibletominimizethepowerrequiredtotransportthewater.
9.Roofcontrolisanever-endingtaskalonghaulwaysandairwaysthatmustbemaintainedforthelifeofthemine.
10.Theleaddrumwillminealmosttwo-thirdsofthecoal,clearancemustbeprovidedunderthemachineforthecoaltopassbyontheconveyer.
11.ThefirststeamenginewasinventedbyJamesWattin1775.
12.Ifthematerialblindsononescreen,itmustblindonmorescreens.
13.Recordsoftrainingreceivedbyeachemployeearerequiredbyfederallawandarealsonecessarysothatmanagementcancomplywiththelawwhenmakingworkassignmentstoemployees.
14.LongwallminingwasusedhereandthereintheUSuntilabout1910.
15.Rockdiffersfrommostotherengineeringmaterialsinthatitcontainsfracturesofonetypeoranotherwhichrenderitsstructurediscontinuous.
16.Heavyrainfallscancauseseriousdamagetoequipmentandcompletelyparalyzeoperations.
17.Sufficientunitshiftsmustbeworkedtoassurethatproductiongoalsarefulfilled.
18.However,itissosmallthatitisignoredinthecalculations.
19.Asthecoalisremovedfromtheseam,thefaceisusuallyadvancedbyeitherconventionalminingorcontinuousminingmethods.
20.Inthelate1970s,menwereemployedforminehaulage,andhumanpowergavewayprogressivelytodogs,horsesandfinallymechanizedpower.
21.Thereareseveralbasictypesofsupportsavailabletoday.
22.StudiesconductedatThePennsylvaniaStateUniversityhaveshownthatcontinuousminingmachineshavemotorslargerthantheyneedwhencuttingcoalonly,butnotwhenminingtopandbottom.
23.Thefirstuseofdiesel-poweredequipmentinundergroundminesinGermanyisbelievedtohavebeenin1939.
24.Fallsofroofaccountforover50%ofthefatalitiesthatoccurincoalminesintheUS.
25.Usually,apairofshuttlecarsisemployed;
onecarisinapositionforloadingwhiletheotheristraveling.
26.Ofcourse,inbythefirstworkingsection,thisvaluewoulddecreaseprogressively,sectionbysection.
27.Sulfurdioxideemissionstandards,ontheotherhand,arenearlyallupgradedbywashing.
28.Becausetheairquantitynecessaryisdeterminedbyfacerequirements,itcanbeachievedonlybyprovidingsuitableareaofairways.
29.Noopenflameispermittedinanyundergroundcoalminearea.
30.Forthisreason,itiscommontoseetwoboltersonaconventionalsection.
31.Generallytwoshuttlecarstravellingonseparateroutesforchangeoutareusedtospeeduptheloading.
32.Pressuresinducedvarydirectlyasfanspeedsquared,anddirectlyasdensity.
33.Thedieselenginewasinventedin1882,butitspracticalapplicationwasnotdemonstrateduntil1897.
34.Theretreatingsystemcallsforlittleornoneoftheexpenditureusuallyinvolvedinmaintainingroadsthroughthegoaf.
35.Thisisanareathathasbeenbadlyneglected.
36.Whitingsystem,designedtoovercomethedisadvantagesoftheKoepesystem,hastwo3to5-grooveddrivingsheaves.
37.Theaccidentpreventionfundamentalsapplytoallindustries.
38.Anumberofmanufacturersareproducingvariouscomponentsforacompletetelemeteringsystem.
39.Lightingofminesisanareathathasbeenbadlyneglected.
40.Inthepeatswampinwhichvegetablematerialaccumulated,streamsperiodicallyoverflowedtheirbanks.
41.Itisobviousthattheaccumulationofmuchtechnologicalinformationisapreludetoasoundeconomicevaluation.
42.Pollutionofsurfaceandundergroundwaters,whichhasbeengoingonmuchlonger,alsoisbecomingincreasinglyserious.
43.Unsafepracticesarejustasimportantasunsafeconditions.
44.Onlyafterthishasbeendonecanthecostofproducingcoalbeforecastwithanyaccuracy.
45.Withtheoptimumdesign,coalfragmentsafterblastingareneithertoobignortoosmall.
46.Oneofthemajorconcernsforlongwallminingistheextentofsurfacesubsidenceanditsinducedsurfacestructuraldamages.
47.Thesingleentrywouldsoonbecomeofsuchlengthandconfinementthatservicescouldnotbereadilysupplied.
48.Eachtechniquehasitsdefendersaswellasitsoutspokencritics.
49.Insomemines,thedrainageisexcellentandwatercausesfewproblems;
inothers,lackofdrainageresultsinsevereinundations.
50.Theefficiencydependsonthechoiceofexplosives,thefiringmeansandsoon.
51.Theresistanceofthemineisa(n)matteroflayoutandmaintenanceoftheventilatingnetwork,andiscontrolledbythemineoperator.
52.Mapsdrawntoshowtheentireminingpropertymaybeplottedtoaverysmallscale.
53.Anotherdisadvantageisthatitisnotsoflexibleasmechanizedboardandpillarandthelongwalladvancingmethods.
54.Itisinterestingtonotethatsuchancompletemonitoringpackageisbeingconsideredbyatleastonecoalminingcompanyforoneofitsnewmines.
55.Thelongertheacid-formingmaterialsareexposedtotheatmosphere,thegreatertheamountofacidthatwillbeformed.
56.Usually,apairofshuttlecarsisemployed;
57.Allcoalscontaincombustiblemineral,anditsoriginisapartoftheproblemoftheoriginofcoal.
58.Practicallyeverypieceofequipmentinanundergroundcoalminetodayoperateselectrically,whetherfrombatteriesorfromthemineelectricaldistributionsystem.
59.Itmaybeeasiertokeepthetubingclosertothefacethanitiswithalinebrattice.
60.Theymaybefromafractionofaninchtoseveralfeetwideandusuallyextendlaterallyformanyfeettohundredsoffeet.
ⅡFillintheblanks.填空(10*1)
1.Themajorityofmodernminefansaretheaxial-flowtype.
2.Europeancoalminingindustryisdominatedbyshaftmines.
3.Theselectionofaportablesiteinvolvesnumerousfactors,suchasmethodofaccess,methodofventilation,typeofhaulagesystem,andexpectedlifeofthemine.
4.Driftingoperationsdifferfromtunneloperationsbecauseofthesmallersize,theuseandthetemporarynatureofthedriftcomparedtothetunnel.
5.Therearetwobroadtypesofroofasfarassupportconcerned.Theyareimmediateroofandmainroof.
6.Indeterminationsofrankofcoal,mineralmatterisexcludedfromtheanalysisasitinnowayreflectsthedegreeofmetamorphismofthecoal.
7.Thetypeofplanningthatprovidesforthecontinuedoperationofthemineoveralongperiodoftimeiscalledlong-rangeplanning;
andthetypethatprovidesthedetailthatisnecessaryfortheoperationonaday-by-daybasisiscalledshort-rangeplanning.
8.Theabutmentpressureoccurringinsolidcoalinfrontofthelongwallfaceiscalledfrontabutment;
andtherearabutmentislocatedinthegobareabridgingbetweentheheadentryandtailentry.
9.Thelongwallsystemconsistsofacombinationofthreebasicequipments.Theyareasupportsystem,acoalminingmachineandahaulagesystem.
10.Mostcoalminefiresresultfromelectricalfailures.
11.Thecarboncontentofcoalsuppliesmostofitsheatingvalue.
12.Coalmininginvolvesbothbasicunitoperationsintheproductionandhandlingofcoalandauxiliaryoperationsofaservicematurethatareessentialbutdonotdirectlycontributetotheoutputofcoal.
13.Thelongwallcanbeminedeitheronadvanceoronretreat.
14.Tominimizetheproblemsassociatedwithaninfluxofunwantedwaterintoundergroundmines;
afour-stepprocessofcontrolissuggested:
prevention,collection,transportation,anddisposal.
15.Thehighestrankofcoalismeta-anthracite.
16.Theamountofairflowinducedinaminewilldependonfancharacteristicandmineresistance.
17.Peopleworkingundergroundmustuseonlyelectriclampspermissibleunderfederalandstatelaws,andnoopenflameispermittedinanyundergroundcoalminearea.
18.Unbalancedhoistingisthesimplestformofhoist,andisusedforprospecting,handlingmenandsupplies,andformineswithsmalloutputs.
19.Unlesstheairisproperlydistributedtotheface,themineventilationsystemisnotperformingitsprimaryfunction.
20.Theratiooftheweightofacubicfootofthesolidtotheweightofacubicfootofwateriscalledthespecificgravity.
21.Themethodoflocatingsubjects,lines,orareasinrelationtoareferencepointorlineiscalledsurveying.
22.Onemajorcauseofunsafepracticesislackofknowledgeorskill.
23.Oneofthekeystoestablishingvegetationaftersurfacemininginthearidandsemiaridwesternstatesisproperregradingtechniques.
24.Theintensityofdamagetothesurfacestructuresdependsnotonlyonthecharacteristicsbutalsotheamountofthedeformation.
25.Facehaulageisdonebyvarioustransportationdevices,butthemostcommonmethodistouseshuttlecars.
26.Thethicknessoftheoverburdenresultsinveryhighgroundpressure.
27.Thegeneralfanlawsarethesameforeitheraxial-floworcentrifugalfans.Theonlydifferencesareinthe
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