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1、辽宁工程技术大学毕业设计ThemethodofmininginChinaTheKnowncoal-bearingareaisabout0.55millionkm2inChina.Almostalltheprovices,cities,autonomousregions(includingTaiwanProvice)possesscertainamountofcoalreserves.Chinaisoneofthccountriesintheworldofwhichthecoalreservesarerichest.Theprove
2、dreservesaccountedfor782234Mtattheendof1985.ThemaindepositioncharacteristicsofcoalformationinChinaareasfollows:(1)Thegeologicperiodwhenthecoalwasformedislong.FromearlyPalaeozoicEratotheQuaternaryPeriodcoaldepositionwasalreadyproved.Sovarioustypesofdepostingstatesandmu
3、ltiseamformationwerefound.(2)Thegeologicalstructuressufferedbycoal-bearingformationsaremuchmore,Sovariousgeologicalconditionsareencounteredincoaldepositingfields,suchasfolds,faults,irregularthicknessandinclinationofcoalseams.Asconsideringthethicknessofcoalseams,theamo
4、untofreservesofthincoalseamsaccountsfor17.36%,ofmediunthickcoaiseamsfor37.84%,ofthickcoalseamsfor44.8%;Asconsideringtheinclinationofcoalseams,theamountofreservesofgentlyinclinedcoalseamsaccountsfor85.95%,ofinclinedoalseamsfor10.16%,ofinclinedseamsfor3.89%.Itbeseenthat
5、0fgently.inclinedmediumthickandthickcoalseamsaccountformostpartofthetotalreserves.Alloftheabovefactorsdeterminedthattheminingmethodspracticallyadoptedmustbe!manifold.Accordingofincompletestatisticinformationtherearetotally54ofminingmethodswhichhavebeenexperiencedinChi
6、na.Theformationoftheseminingmethodshasundergonealongperiod.Especially,afterthefoundingofP.R.Chinaminingmethodsaregraduallydevoloping,reformingandimproving,andabundantexperienceshavebeenaccumulated.Chinaisnotonlyoneofthecountriesintheworldwhichproducelargeamountofcoale
7、achyear,butalsooneoftheearliestcounhriesintheworldwhichexploitandutilizecoalreserves.ThehistoryofexploitingandutilizingcoalreservesinChinabeganasearlyas6to7thousandsyearsago.Beforeliberation,onlythemachinespoweredbysteamenginewereusedinfewproductionallink,suchasinhois
8、ting,waterdrainage,ventilationetc.Somequitebackwardminingmethods,liketheentryretreatingminingandabandonedpillarminingetc,wer
