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ID:30029988
大小:2.99 MB
页数:30页
时间:2018-12-26
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1、本科毕业设计英文翻译题目加拿大岩爆支护手册学院水利水电学院专业水利水电工程 学生姓名尹刚 学号0943062172年级09级 指导教师张茹 二Ο一三年六月三日四川大学本科毕业设计英文翻译—CanadianRockburstSupportHandbook2.1IntroductionExplicitanalysisofeachpotentialrockburst-damagemechanismandtheinteractionbetweentherockmassandthesupportsystemarecomplex
2、tasks.Thischapterprovidesasummaryofthekeyitemsfoundinthishandbooksuchthatthepractitionerisprovidedwithguidanceforsupportselectioninburst-pronegroundwithoutundertakingalloftheanalyticalstepsnecessarytocompleteadetaileddesign.Forthissummarychapter,detailsoftheana
3、lysisprocedureshavebeenomitted,buttheyaredescribedinsubsequentchapters.Rockburstdamagereferstodamagethatoccursaroundanexcavationinasuddenorviolentmannerandisassociatedwithaseismicevent.Rockburstdamagemaynotnecessarilyresultinejectionofrockintotheexcavation,espe
4、ciallyiftheexcavationiswellsupported.Thedamagemechanismsassociatedwithdifferenttypesofrockburstsvaryfromsituationtosituation(Kaiser1993;OrtleppandStacey1940).Thefirststepindealingwithsupportselectionforburst-proneconditionsistoestimatethetypeofdamagemechanismin
5、volvedandthelikelyseverityoftheresultingdamage.Alsoitisusefultounderstandtheconditionsthatleadtoortriggerarockburst.2.2Whatcausesrockbursts?Forthepurposesofhazardassessmentandsupportdesignwedistinguishbetweenrockburststhataretriggeredbyremoteseismicsourcesandro
6、ckburststhatare“self-initiated”.Forself-initiatedrockbursts,thelocationofthedamageandtheseismiceventarethesame.2.2.1Self-initiatedrockburstsSelf-initiatedrockburstsoccurwhenthestressesneartheboundaryofanexcavationexceedtherockmassstrength,andfailureproceedsinan
7、unstableorviolentmanner.Thestressesgenerallyincreaseasaresultofnearbymining.Inaddition,therockmassstrengthmaydegradewithtimeorwithlossofconfinement,leadingtosuddenfailure.Ineithercasetherockmassstrength-to-stressratioreachesunityandtherockfails.Thefailureproces
8、sissuddenandviolentifthestoredstrainenergyintherockmassisnotdissipatedinagradualmanner.Thisoccurswhenthestiffnessoftheloadingsystem,i.e.,theminestiffness,issofterthantheunlo
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