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                [24] DINGYJ,LIUSY,LIJ,etal.TheretreatofglaciersinresponsetorecentclimatewarminginwesternChina
                       [J].QuaternarySciences.2006,1(43):97 - 105.




                      Researchonheattransfercharacteristicsongroundsurfaceandthermalboundary
                               settingmethodincentrifugaltestsforcoldregionsengineering
                                                              2
                                                                         1
                                            1
                                 ZHANGChen,CHENHongyong,WANGYi,CAIZhengyin              1
                                      (1.NanjingHydraulicResearchInstitute,Nanjing 210024,China;
                          2.InstituteofSystemsEngineering,ChineseAcademyofEngineeringPhysics,Mianyang 621000,China)

                  Abstract:Theaccuratesimulationoftemperaturefieldisthekeytocarryoutgeotechnicalcentrifugaltestsforcold
                  regionsengineering.Neglectingthesettingofthermalboundaryconditionsinmosttestswhereusingsemiconductor
                  refrigerationdevices ,whichmakesitdifficulttoensuretheaccuracyofthetest.Inordertoimprovetherationality
                  andaccuracyoftests ,thefiniteelementCFDmethodwasusedtosimulatetheheattransferprocessintheconfined
                  spaceunderthesupergravityfield.Bychangingthemainboundaryconditionssuchasmodelscale (acceleration),
                  outputtemperatureandgapspacing,theheattransfercharacteristicsandtheirspace - timelawsbasedonsemicon
                  ductorheatexchangerareclarified.Onthisbasis,combinedwiththecharacteristicsoftheequipmentandtruecon
                  ditions ,thetemperatureboundaryofthemodelisdescribedbytheairfreezingindex,astheoptimalindexfor
                  matchingprototypetemperatureatgeotechnicalcentrifugaltestsforcoldregionsengineering ,whichspecifyingthe
                  heatboundaryparametersettings.
                  Keywords:coldregionsengineering;centrifugaltest;heattransfer;temperatureboundary;freezingindex


                                                                                    (责任编辑:李 娜)


              (上接第 716页)
                            Effectsoffreezing - thawingactiononthemacro - micropropertiesof
                                             bankslopesoilandbankstability
                                                     1
                                         1
                                                                             1
                                                               1
                               YANGZhen,JIHonglan,LIChao,MOUXianyou,LIBashuan             2
                      (1.CollegeofWaterResourcesandCivilEngineering,InnerMongoliaAgriculturalUniversity,Hohhot 010018,China;
                          2.HohhotTuoketuoCountyRuralRevitalizationCoordinatedDevelopmentCenter,Hohhot 010200,China)
                  Abstract:Freeze - thawactionisthemainfactorofbankslopeinstabilitydamageintheseasonalfreezingzone.
                  TakingthebankslopesoilofShisifenzibendinInnerMongoliaoftheYellowRiverastheresearchobject ,themac
                  roscopicandmicroscopicpropertiesofthebankslopesoilunderfreeze - thawactionwerestudiedbytriaxialshear
                  andscanningelectronmicroscopetests ,andthestabilityofthebankslopebeforeandafterfreeze - thawwasana
                  lyzedbasedonthestrengthreductionmethod.Theresultsshowthatthemodulusofelasticity ,cohesionandshear
                  strengthofthesoildecreasewiththeincreaseofthenumberoffreeze - thawcycles,amongwhichthesizeofthe
                  modulusofelasticityisinverselyproportionaltothemoisturecontent,thecohesiondecreasesby43.6%~60.04%
                  after15freeze - thawcycles ,andtheangleofinternalfrictionhasnoobviouschangepattern.Soilparticleroundness
                  andporeprobabilityentropydecreasedandthenincreasedwiththeincreaseofthenumberoffreeze - thawing ,while
                  thechangetrendofparticlefractaldimensionisopposite ,andsoilorientationandporosityshowedanincreasing
                  trend.Cohesioniscorrelatedwithsoilporosityandparticleroundness ,andespeciallyhighlynegativelycorrelated
                  withporosity ,andthereisasignificantautocorrelationbetweensoilmicroparameters.Thestabilitysafetyfactorof
                  thebankslopeafterfreeze - thawdecreasesby41.8%,indicatingthatthefreeze - thawactionwillsignificantly
                  reducethestabilityofthebankslope,andthebankslopeispronetoinstabilitydamageafterfreeze - thaw.
                  Keywords:freeze - thawcycles;shearstrengthindex;microstructure;bankstability;InnerMongoliareachof
                  theYellowRiver

                                                                                    (责任编辑:李福田)

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