2023年全國(guó)碩士研究生考試考研英語(yǔ)一試題真題（含答案詳解+作文范文）_第1頁(yè)
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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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