欢迎来到天天文库
浏览记录
ID:16112592
大小:35.00 KB
页数:9页
时间:2018-08-08
《采煤概论 复习资料(review materials for coal mining introduction)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、采煤概论复习资料(Reviewmaterialsforcoalminingintroduction)Fortheconvenienceofdrainage,theaditmusthave3%~5%waterslope.Accordingtotherelativepositionsoftheaditandthecoalseam,itcanbedividedintoonetothehorizontaladitandtheverticaladit.Thebottomofthewellisthegeneralnameofasetofroadwaysandtunnelsconn
2、ectingtheshaftofthewellboreandthemainstonegate.Thetransportationlineofthebottomholeincludesthestorageline,thedrivinglineandtheauxiliaryline.Thebottomholecanbedividedintotwotypes:ringformandreturn-type.Theringyardcanbedividedintohorizontal,obliqueandvertical.Atpresent,therearetwokindsoft
3、ransportationmethods:railtransitandbeltconveyor.Accordingtothecoalseamnumberofthetransportationroadwayservice,thelayoutofthetransportationroadwaycanbedividedintothreekinds:themainlane,themaintransportationandthemainroad,andthemainroad.Thetransportationofthemainroadtowardsthebottomofthes
4、haft,generallyshouldmaintain3%%ofthedownhill.Itisalsopreferabletoreducetheamountofwaterdisplacementortopreventgutterandtheslopeoftheroadway.Theconstructionofthewellroadwayisfirsttobreaktherock,andthecommonlyusedrockbreakingmethodhastwokindsofmechanicalrockbreakingandblastingrock.Thebasi
5、croofofdifferentlevelsisdifferentforthefirsttime,generallyabout20-35m.Alongtheairroute,thetunnelingshouldbestartedaftertheroofisstable.Thesiteofcoalmininginthemineiscalledcoalminingface.Thestrataofthetopfloorofthecoalseamconstitutethesurroundingrockoftheminingfield.Thesurroundingrockgen
6、erallyincludesthefollowingfourparts:1.Thesizeoftheinitialstepdistanceisrelatedtothethicknessofthebasicroof,lithology,geologicalstructureandotherfactors,Thetypesofscaffoldsandtheinteractionmodesofbracketsandsurroundingrockscanbedividedintothreetypes:bracing,screenandsupport.Thepressureof
7、airflowinundergroundroadwayiscausedbymechanicalwindpressurecausedbyventilationmachinery.Ventilationiscalledmechanicalventilationbymechanicalwindpressure.Theventilatorisdividedintotwokinds:centrifugalfanandaxialflowfanaccordingtothestructure.Mineventilationmethodistheworkingmeth
此文档下载收益归作者所有