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Study on the material character steel bigend bolt
JoURNAL oF CoAL SCIENCE ENGINEERING
(CHINA) ISSN 1006—9097
PP 616-620 Vo1.14 No.4 Dec.2008
Studyonthematerialcharactersteelbig-endbolt
SHIJian-jun(石建军)’.一,MANian-jie(马念杰)’,ZHANPing(~ 平)’,ZHANGDian.1i(张典礼)
(1.SchoolofResourceandSafetyEngineering,ChinaUniversiytofMiningandTechnology(Beijing),Beijing 100083,
China;2.SafeytEngineeringCollege,NorthChinaInstituteofScienceandTechnology,Beijing 101601,China)
Abstract Basedonthemanufacturingmethodnow usedinourcountry.causedIow bear-
ingcapacityinthebolt-end.whichIsapotentiaIdangerintheboltsupportingtunneIanda
waste ofmoney.and presented the new typestrong steeIbig—end boltcansolvethis
problem.AnalyzedtheactivestateoftheendofboltbyANSYS,wecanknow thatItis
very disadvantagewhenboltboreeccentricload.Contrastedwiththedifferentthatcom-
monboltandbig.endboltwhentheyborethesameloading.Thecommonboltisbigger
thanthebig—endboltjnstressvalue.StudyOl3theprocessingtechnicofthenew typeof
thestrongsteeIbig.endbolt.thenew metalbig.endboltwasproducedbyheatprocessing
overbig.end boltandupset.From themicroscopicexaminationonboltmetal。itiscon-
cludedthatheatprocessingonthebolt—endrefinesthecrystaIgrainofthemetaImateria1.
whichnotonlyincreaseitsextensionbutimproveItsproperty.Moreoverthestrengthability
oftheboltmateriaIcanbeexertedcompletely.
Keywords big-end bolt,processing technic,microscopic examination,finite element
analysis
andhighproductionofthemine.Nowadayshighin—
Intr0ductiOn
tensiyt supportingtechn iquehasbeencommonusedat
Tunnelsupportisakeytechniqueincoalmining. homeandabroad,which gainedgreateconomicand
A proper,safe,reliabletunn elsupporttechn iqueisa socialbenefits.
necessityforaminetomakeahigherproductionefn—
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