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《Development of Stress Measurements and Instrument Placement》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、DevelopmentofStressMeasurementsandInstrumentPlacementTechniquesforLongwallCoalE.G.Zahl,J.P.Dunford,D.R.Tesarik,M.K.LarsonSpokaneResearchLaboratory,NationalInstituteforOccupationalSafetyandHealth,Spokane,Washington,USAJ.ChenRAGAmericanCoalCompany,Waynesburg,Pennsylvania,USAABSTRACT:Wes
2、terncoalminesareoperatingunderincreasinglychallenginggroundconditions.ResearchersattheSpokaneResearchLaboratoryoftheNationalInstituteforOccupationalSafetyandHealtharecooperatingwithminestoevaluatehowtheseconditionsaffectmineopeningstabilityandrelatedminersafety.Asystemwasdevelopedtomo
3、nitorrockandcoalstressesduringminingofanentirelongwallpanel.Thesystemwasdesignedtogeneratedatainnearrealtimetoevaluaterockbehaviorinroofstrataandtheonsetofhazardousconditionsasoverburdenstresswasredistributedoverworkingentriesduringgobformation.Computersimulationsandin-mineevaluations
4、wereusedtooptimizeinstrumentplacement.Aprototypepackerassemblywasdesignedandtestedforinstallingsensitiveinstrumentsinamineroof.Thispaperprovidesbackgroundinformationonthestressmonitoringconceptandfocusesonthedevelopmentofinstrumentplacementtechniquesandtheprototypepackerassembly.1BACK
5、GROUNDremovalandgobformation.Stressesaretransferredthroughroofstratafromtheareaofactivemining1.1Stressmonitoringsystemconceptbacktotheinstrumentsite.AdataacquisitionsystemretrievesdatafromtheseinstrumentsatpreResearchersattheSpokaneResearchLaboratoryselectedtimeintervals.Rawdataarethe
6、nprocessed(SRL)oftheNationalInstituteforOccupationalandreducedandusedtogenerategraphs.TheseSafetyandHealth(NIOSH),incooperationwithagraphsillustratetrendsthatmaybeusedtoevaluateminingcompany,havedevelopedandcontinueto(1)behaviorofroofstrataabovemineopenings,(2)refineastressmonitoringa
7、ndreportingsystem.Theimminentcatastrophicevents,(3)effectssuchasinitialobjectivewastodetermineifstressmonitortypicalyieldpillarmovementthatarenotasafetynginstrumentscouldgathersufficientdatatorecogconcernbutmaydistortneededinformation,and(4)izetheconditionsleadingtocoalbumpssothesepla
8、cemen
