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                     Influencefactorsandpredictionmethodofthermalconductivityfordispersiveclay

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                                            1,2
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                                                                            1
                               WANGLixiang ,SONGXinjiang,HUANGMing,WANGMiao
                                (1.CollegeofCivilEngineering,HefeiUniversityofTechnology,Hefei 230000,China;
                                  2.AnhuiandHuaiheRiverInstituteofHydraulicResearch,Hefei 230000,China;
                                   3.HeilongjiangProvinceHydraulicResearchInstitute,Harbin 150080,China)
                  Abstract:Itisverycommonthatthedispersiveclaydamageiscausedbythefreeze - thaw(F - T)cycles,
                  especiallyinwaterconservancyprojectsinNortheastChina.TheF - Tcharacteristicsunderhydratingconditionsof
                  dispersiveclayaredifferentfromthoseofnon - dispersiveclay.Thethermalconductivityofsoilisthemostimportant
                  parameterinsoilthermalanalysis.Inthispaper ,thedispersiveclayistakenastheresearchobjecttoclarifythe
                  factorsaffectingthethermalconductivityofthedispersiveclay.BasedontheimprovementoftheJohansenmethod ,
                  athermalconductivitypredictionmethodsuitableforthecharacteristicsofdispersiveclaywasestablished.There
                  sultsshowthatthemainfactorsaffectingthethermalconductivityofdispersiveclayaremineralcomposition ,mois
                  turecontent,porosity(drydensity),andtemperature.Whenthetestsamplesarebelowzero,thelowerthetem
                  perature ,thegreaterthethermalconductivityofthesoil.Whentheinitialmoisturecontentislowerthan10%,the
                  thermalconductivityofsoilisnotaffectedbytemperature,butfor15%,thethermalconductivityofsoilisgreatly
                  affectedbytemperature.Thethermalconductivitymodelofdispersiveclayinthesaturatedstateisdifferentfrom
                  thatofnon - dispersiveclay ,anditiscalculatedbyseries?parallelpredictionmodels.Theproposedpredictionmod
                  elandformulaforthethermalconductivityofdispersiveclayintheseasonalfrozenareacouldreflecttheinfluenceof
                  temperature ,mineralcomposition,moisturecontent,anddrydensity.Itisconsistentwiththetestresultsand
                  couldbeusedforacademicresearchandengineeringapplicationsofdispersiveclayintheseasonalfrozenarea.
                  Keywords:dispersiveclay;thermalconductivity;frozensoil;influencefactors;predictionmethod

                                                                                    (责任编辑:李 娜)

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