Abstract:
UniaxialtensilesimulationswerecarriedoutinOA,OBandOCdirectionsofkaoliniteatdifferent temperaturesbyusingmoleculardynamicssimulations*Thedeformationandfailureprocessesofkaolinite werestudiedattheatomisticscale*Thechangeofmicrostructure,deformationmechanismandtemperature effectoftensilemechanicalpropertiesofkaoliniteatdifferenttemperatureswerealsoanalyzed*Thiswork wouldbehelpfultounderstandthemechanismsoflargedeformationandfailureofsoftrock*Theresultsindi⁃ catedthattheincreasingoftemperatureresultsinthethermalexpansionofkaoliniteafterrelaxation*Once thecracknucleationappears,itpropagatesveryquicklyandleadstoasharpdecreaseinstressalongOAand OBloadingdirections*ThelayerseparationoccursduringloadingalongOCdirection,whilethestructure couldfailsincethehydrogenbondsarebroken*Themechanicalpropertiesofkaolinitehaveastrongdepend⁃ enceontemperature*Thereisanegativecorrelationbetweentensilestrength,Young*smodulusandtempera⁃
ture*Withtheincreaseoftemperature,thetensileultimatestrainandresidualstrengthtendtodecrease,and thestrengthattenuationcoefficienttendtoincrease*Inaddition,OCdirectionisthemostaffectedbythetem⁃ perature,followedbyOBdirection,andOAdirectionistheleastaffected*