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1、英文原文AbstractThefactsaffectingtheperfmanceof90kWshieldedroadheaderisinvestigatedindetailinatunnelexcavatedfNuhCementFacty.Thefirstpartofthetunnelishizontalthesecondpartisinclinedwith9_excavateduphill.Tunnelpassesthroughaf
2、mationoftheUpperCretaceousagewithnodularmarlcarbonatedclaystonethinthicklaminatedlimestone.Wateringresschangesfrom0to11lmin.Insixdifferentzonesitisfoundthattherockcompressivestrengthchangedfrom20to45MPatensilestrengthfro
3、m1to4MPaspecificenergyfrom11to16MJm3plasticlimitfrom15%to29%liquidlimitfrom27%to43%waterabsptionfrom4%to18%involume.Detailedinsituobservationsshowthatindryzonesfthesamerockstrengththeinclinationofthetunnelthestratahelpto
4、increasetheinstantaneouscuttingratefrom10to25solidbankm3cuttinghour.Theeffectofwateroncuttingrateisdramatic.InthezoneswheretheplasticlimittheamountofAl2O3islowinstantaneouscuttingrateincreasesfrom34to50solidbankm3cutting
5、hourwithincreasingwatercontentfrom3.5to11lmin.HoweverinthestratahavinghighwaterabsptionacteristichighamountofAl2O3cuttingratedecreasesconsiderablyduetothestickymudcausingproblemtothecutterhead.Excavationmuckloadingsupptw
6、ksareperfmedseparatelyduetosafetyconcernsinthewetinclinedsectionswhichreducedthemachineutilizationtimefrom38%to8%.Theinfmationgatheredisbelievedtofmasoundbasisincontributingtheperfmancepredictionofroadheadersindifficultg
7、roundconditions._2004ElsevierLtd.Allrightsreserved.McFeatSmithFowell(19771979)showedthattherewasacloserelationshipbetweenspecificenergyvaluesobtainedfromcecuttingtestscuttingratesfmediumheavyweightroadheadersseparately.T
8、heyreptedalsothattoolconsumptionmightbepredictedfromweightlossofcutterusedincecuttingtest.Rockcuttabilityclassificationbasedoncecuttingtestisusuallycriticizedasthattheeffectofrockdiscontinuitiesarenotreflectedinperfmance
9、prediction.Bilginetal.(1988199019961997)developedaperfmanceequationbasedonrockcompressivestrengthrockqualitydesignationasgivenbelowwhereICRistheinstantaneouscuttingrateinsolidbankm3cuttinghourPisthepowerofcuttingheadinhp
10、RMCIistherockmasscuttabilityindexrcistheuniaxialcompressivestrengthinMPaRQDistherockqualitydesignationinpercent.Dunetal.(1997)comparedthemodelsdescribedbyBilginetal.(19881990)McFeatSmithFowell(19771979)inaresearchwkcarri
11、edoutatKumbaldaMinewhereaVoestAlpineAM75roadheaderwasutilized.Twodistinctgroupsofdatawereevident.ThedatagroupedaroundBilginlinewasstronglyinfluencedbythejointingweaknesszonespresentinrockmass.Theothergroupofdataontheline
12、producedbyMcFeatSmithFowellcrespondedtoareaswherelessjointingfewerweaknesszoneswerepresent.Oneofthemostacceptedmethodtopredictthecuttingrateofanyexcavatingmachineistousecuttingpowerspecificenergyobtainedfromfullscalecutt
13、ingtestsenergytransferratiofromthecuttingheadtotherockfmationasinthefollowingequation(Rostamietal.1994RostamiOzdemir1996)whereICRisthinstantaneousproductionrateinsolidbankm3cuttinghourPisthecuttingpowerofthemechanicalmin
14、erinkWSEoptistheoptimumspecificenergyinkWhm3kisenergytransfercoefficientdependingonthemechanicalminerutilized.Rostamietal.(1994)stronglyemphasizedthatthepredictedvalueofcuttingratewasmerealisticifspecificenergyvalueinequ
15、ationwasobtainedfromfullscalelinearcuttingtestsinoptimumconditionsusingreallifecutters.Rostamietal.(1994)pointedoutthatkchangedbetween0.450.55froadheadersfrom0.85to0.90fTBMs.Bilginetal.(2000)showedintheirexperimentalnume
16、ricalstudiesthatperfmanceofmechanicalminerswasaffecteduptoacertaindegreebytheearthoverburdenpressurestress.Copuretal.(2001)showedthatspecificenergyobtainedfromfullscalelinearcuttingtestsinoptimumcuttingconditionswashighl
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