版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡介
CAVERISKCONTENTSTypesofriskMajoroperationalrisksBlackhatactionstrategiesTypesofriskHeslop2000DesignrisksOperationalhazardsDrawrisksTechnologyrisksDesignrisksEconomiceffectBasedonincorrectgeotechnicaldataAbovecollectedyearsbeforePoorassessmentofgroundconditionsCommonexample
-partiallyloggedcore(egUCS&RQD) -Forcedtousebecauseoflackoffunds -Resultsotherparametershavetobeguessed -uncertaintyindesignparameters -Undersupportofdriftsby25%CommongeotechnicalfailuresNostudydoneStudymissingLackofdetailforstudylevelDetaildefaultScopingstudydetailacceptedforDEFSClassificationdesignusedonlyNotaddressingthekeyissuesmentionedatearlierstagesConceptualstagenotcorrectNotunderstandingimplicationsofrecommendationsNotunderstandingdesignphilosophyNotreadingstudyreports -80%donotreadreport -15%executivesummary -5%reportPracticalmeasuresFocussstudy/reasonablenesstest
-Reviewandcompileotherstudies -Readextensively(take1week) -Literaturestudy -Benchmark -developfeelfortheproject -FindingsFindout(Summers2000):
-Whatweknow -Whatwedon’tknow -Whatweknowwedon’tknowStudystandards(AusIMM)UnresolvedissuesUnresolvedissuesAspectsthatcannotberesolvedduringthestudySpecialbridgingstudies(i.e.caving)Ruleforspecialstudies
-Impactonprojectgreaterthancontingency -Infrastructurestability -Cavability -dilutionanddilutionblanketsIfnocashortimeforspecialstudy -Runprojectonbluesky -Sensitivityonworstcase -opinionrequired
OperationalrisksHeslop2000LossoflifeClosemineorsectionofthemineRockburstsAirblastsMudrushes/floodsRock/strainburstingStressincreasesasundercutisdeveloped.Stressesincreasesfurtherbeforepropagation.PerimeterstressesincreasewithareaundercutandheightofundercutRock/strainburstdamagegreatestbeforepropagationRockburstingrelatedtocavingRockburstingrelatedtomanagementofcavingprocessRockburstcavepronecaves>300-400mHightectonicstressesMountainsMRMR>35DifficultyinpropagatedthecaveRapidratesofadvancesofpre-break/UCEl-Tiente1976RockburstingFracturedzoneexistsaroundthecave50mfromthecavefaceAsthecaveprogatesthiszoneincreasesFracturezoneincreaseduetostressrelaxationDuringthisstagesareasupto500mfromcaveeffectedStrainburstscanoccurinplaceslikecrusher,plats,cribbroomsStrainbursting,ejectionRockburstingBurstsoccurwithcavepropagationHighlevelsofseismisitybeforepropagation.MagofuptoRichter3.6Largecaveshaveupto6largeburstsifnotmanagedSeismiceventsduringpropagationareshearrelatedCommonareasforbursting20to40mfromcaveface/frontStrainburstingandrockejectionatbreakaways/intersectionsupto500mfromcave100mbelowthecaveLargeexcavationswith50mfromorebodyPillarsbetweenconferencingcavefrontsBeforepropagation.RockburstpreventionstrategiesMeshwalls/backsofintersections/largeexcavations500mfromcaveConeboltintersections/breakawaysInstallyieldingsupportwithin40mfrompropagationfacepositionReduceblockcavedrawrates<2000/tons/daybeforepropagationReduceblockcave/SLCpre-breakadvanceratesbelow3000m2/month.Propagatethecavefirst.SLC<45mvertical/m/yrMinetowardsthesolidMajorairblasts4conditionsAgapbetweenthemuckpileandcavebackCavinghasslowedorstoppedAlargevolumeofcavebackmustbeunstableAirescaperoutesGeotechnicalHardintrusivethroughtheorebodyHardorezonesaboveuclevelNeckingortaperingoforebodyNopitsubsidenceHistoryofcontactorewedgeformationHistoryofstallHardcavesMuckpileCavegapNorealhardrulesExperientialCriticizedOldminingrule200mm/daydrawrateRealisticcavebackgapsarebetween2mto15m2mto5mgoodfornormalproduction15-30mdrawrategreatercavingrate30m>problemofdrawcorrection/airblasts30m-50mofmuckpileAllabovewrongiftunnelsintocaveCavestallCavingstopsorslowsVerticalMRMR>thanUCHRCavinghoopstressesstrengthrockmassBlockheight2xfootprintwidthDrawrategreaterthancavingrateHardcaves<44mm/daySoftcaves<75mm/dayType1collapse(Bell1999)MUCKPILEAIRGAPSurfaceBackFailsType2collapse(Bell1999)MUCKPILEAIRGAPSurfaceBlockfallsfrombackType3(Flores1993)wedgeSTRUCTUREAirsources&escaperoutes2mainairsourcesroutes-airinmuck/cavebackgap-airinmuckpilevoidsAirescaperoutes-Viaundercutdrawpoints-Muckpiletodrawpoints-OldworkingsholedincaveeffectsLossoflifeSuddensubsidenceCollapseofblockcontactareaPointloadingondriftsHang-upsDestructionanddamagetoservicesLossofproductionDriftrehabPreventionDefinerockmasscondition100mverticalintervalsHRdesignedhardgeotechnicalunitMajorwedgestructureassessmentCorrectdefinitionofdrawrateKeepdrawpointsfullGooddrawcontrolCSMcaveifpossible/3ddrawprofilesPlugalltunnelsintocaveSiteplugsoutsidebreakbackzoneTele-remotedrawpointsDrawpointsfullMonitorcavebackEvacuatemineinfailure/dangertimesMUDRUSHESButcher(1999-2000)Effects-Lossoflife-Lossofmine-Productionloss-Airblasts-majorrehabMudrushconditionWaterMudmaterialsDischargepointDisturbanceMudformingmaterialsCavewasteswithshaleTailing/slimesormuddepositedingloryholeWeatheredoverburden/soilSuspectedTKBKimberlitematerialGypsum/claymineralsFinecavewaste20%sandsizematerialMoisture>8.5%MUDMudformingmechanicsShale/mudformingmaterialdrawnintocave.AbovematerialisgrounddownmuckpileactionGroundmaterialliesinmuckpilevoidsWatermixeswithmaterialtoformmudMudisdrawnoutorflowsoutMudcanbeforcedoutbycollapsingmuckpilevoidsDischargepointsTYPE1DRAWPOINTSMudtransportexcavationsMTE’sMudtransportexcavationsMufairia-morepeoplekilledfromMTEcut-offsCut-offonlowerlevelsandbehindMTE’s-Orepasses-RAP’s-Declines-AccessesFactsTailingsinrushesgreaterdangerWidedrawpointsgreaterdischargeSLCpoorcontrol2miningblockslostwithSLCPoormuckpiledrainagegreaterdangerAirblastsoccuraftermudrushesFloodingoccursDestructionofservicesMudrushprevention3D’’SPRINCIPALDistance-keepmudformingmaterialsoutofmuckpileDrain-keepmuckpilesdryDraw––gooddrawcontrolstandardsMeaningGooddrawcontrol-Uniformdrawdown-drawdisciplineDrainage-Minepumping-Surfacepumping-keepundergroundworkingsdry-Preventinflowsinmuckpilefromundergroundandsurface-Hydro-geologicalstudyDistance-bottom-upcavingmethods(reduceSLC’s)-Sitetailing/slimesdamsawayfromgloryhole-Donotdisposeofminingwasteingloryhole-removemudformingmaterialifpossible-correctopenpitslopedesignMeaningUsesmalldrawpointsize(3.8mx3.8m)SealoldpassesandworkingsInstallmorepumpsInstallwaterpreventionstallsMudrushalarmsMonitoringpumpinglevelsLowerinpumpingmeanswaterinmuckpileTele-remotesClosedboggerc
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫網(wǎng)僅提供信息存儲空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- 道德與法治二上15.《可親可敬的家鄉(xiāng)人》(人教)公開課教案教學(xué)設(shè)計(jì)課件
- 人教部編版四年級語文下冊教學(xué)課件18小英雄雨來
- 現(xiàn)代氣動(dòng)與液壓技術(shù) 課件 6溢流閥的應(yīng)用
- 道德與法治一上《16-新年的禮物》課件(2)公開課教案教學(xué)設(shè)計(jì)課件
- 高中化學(xué)-第三章-難溶電解質(zhì)的溶解平衡(第二課時(shí))課件-新人教版選修4
- 人教版小學(xué)數(shù)學(xué)六年級下冊課件:《練習(xí)七》習(xí)題課件
- 康復(fù)中心建設(shè)方案范本
- 人教版小學(xué)數(shù)學(xué)六年級下冊課件:六下人教第二單元第1課時(shí)圓柱的認(rèn)識
- 云南省昭通市(2024年-2025年小學(xué)四年級語文)統(tǒng)編版開學(xué)考試(上學(xué)期)試卷及答案
- 云南省昆明市(2024年-2025年小學(xué)四年級語文)人教版期末考試((上下)學(xué)期)試卷及答案
- 幼兒園故事繪本《賣火柴的小女孩兒》課件
- 企業(yè)安全生產(chǎn)簡介
- 北京大學(xué)簡介介紹PPT模板
- 餐飲加盟意向書范本3篇
- WesternBlotting(半干轉(zhuǎn))超級詳細(xì)步驟
- (完整word版)藥房調(diào)劑差錯(cuò)登記本
- 應(yīng)收應(yīng)付賬款明細(xì)表(自動(dòng)匯總)常用模板
- 年產(chǎn)萬瓶大輸液葡萄糖注射液車間GMP工藝設(shè)計(jì)
- 新安全生產(chǎn)法和環(huán)境保護(hù)法培訓(xùn)效果評價(jià)
- 課題研究前期調(diào)查問卷
- 幼兒園大班數(shù)學(xué)下學(xué)期每日一練試卷一
評論
0/150
提交評論