Stress state and caving danger of the roof in bolt supporting roadway

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1、维普资讯http://www.cqvip.comJOURNALOFCOALSCIENCE&ENGINEERING(CHINA)ISSN1006—9097pp34—36'Co1．12No．2Dec．2006StressstateandcavingdangeroftheroofinboltsupportingroadwayLIUShao-wei(；~J少伟)，XULi-li(i~莉莉)(EnergyScienceandEngineeringCollege，HenanPolytechnicUniversity，Jiaozuo454003，China)AbstractThestartpoi

2、ntofthistextisthebo~leneckproblemofboltsupportingcoaIentthatissecurityproblemofboltsupportingroof。wedivideoneentryintosomesectionswithdiferentstress．simulatestressfieldofwalIrockandrockboltsolidifiedatdiferentsectionsusedumbrelladispersesoftUDEC(universaldistinctelementcode)，weeducethatthestre

3、ssfeveIofwallrockandboltsolidifiedishigherinrooffalIrisksection。androofrockboltIoadcanreflectthisruleclearly．thatoferanimportantguidelineinmonitoringentryrooffaIIrisk．Keywordsboltsupporting，rockboltsolidifiedstress，rooffall，roofrockboltanalogycombinedtheoryanalysisisusedabroadinIntroductionbol

4、tsupportingdesignmethod．GeologyconditionsTherooffallharminboltsupportingcoalentryischangerapidlywiminonehundredmeters．thesup-great．Thedistributionofstressincoalentry，damageponjngintensitycan’tadapttheconditionsofcoaldegreeandtheruleofroofdeformationayeconcealed，entry,sothreezoneswiljappear：sup

5、portingoverplussoitisnoteasytofindouttherule．Agreatmanyofzone；suppomngmoderatezone；supportingShortage．exDertsathomeandabroaddomanystudyprogramsZOne．inboltsupportingmechanism，supportingoccasion,Fig．1f。】isthedestroymodeofsupportingshort-supportingparametersAtpresent，engineeringagezone．(a)(b)(c)F

6、ig．1Roofbreakgraphbyusingcablesupportinginscanea(a)ThecaneisinaetiveatonthoroughLy；(b)Roofbreaknearbysteelband(orreinforcementLadderbeam)；(c)RoofbreaknearbythepaLLetofcable(d)Roofbreaknearbyentrystress．stress—reliefmethodisincommonuse．1ResearchcontentandthoughtprocessOnemineareahas2-3measuring

7、points，consistencyTherooffallriskexistsinsupportingshortageshouldincrease．Howcangetcontinuousstressmes-zone，entryandhighstress，faultandjointplanearesageinearlystageisactivedemandsolved．it’sfactors．StresslevelofentryhasgreatimpactonInves