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                                 ExperimentalstudyonthesizeeffectofdoubleK fracture
                                             parametersinstratifiedsandstone

                                           1
                                                                          1
                                                         1
                                  XUShilang,HANMingjie,WANGQingmin,LIUFushen           2
                                 (1.InstituteofAdvancedStructures,ZhejiangUniversity,Hangzhou 310058,China;
                       2.ResearchCenterofCoastalandUrbanGeotechnicalEngineering,ZhejiangUniversity,Hangzhou 310058,China)

                  Abstract:Sandstone,asarepresentativesedimentaryrock,iscommonlyencounteredinengineeringproblems
                  suchastunnelexcavationandslopestability.Asatypicalquasi - brittlematerial,thefracturepropertiesofsand
                  stonearecrucialmechanicalcharacteristicsinengineeringapplications.Toinvestigatetheinfluenceofbedding
                  planeorientationandspecimensizeonthedoubleKfractureparametersofsandstone,thisstudyconductedsystem
                  aticthree - pointbendingfracturetestsusingbeamspecimenswithheightsof10,20and40mm,andbeddingan
                  glesof0°,30°,60°and90°,respectively.Completemacroscopicresponsecurves,fractureparameters,and
                  failuremodeswereobtainedthroughtheexperiments ,confirmingthatthefractureprocessofsandstonecanbefully
                  describedusingthedoubleKfracturemodel.Boththedipangleofbeddingandthespecimenheightsignificantlyaf
                  fectthedoubleKfractureparameters :withaconstantspecimenheight,thepeakload,unstablefracturetough
                  ness ,andinitiationfracturetoughnessdecreaseasthebeddingdipangleincreases,whilewithconstantbedding
                  planeorientation ,thepeakloadandunstablefracturetoughnessincreasewithspecimenheight,buttheinitiation
                  toughnessremainsrelativelyunchanged ,furtherverifyingitasaninherentmaterialproperty.Additionally,the
                  failuremodesofthespecimensexhibitclearanisotropiccharacteristicsbasedonbeddingplaneorientation ,showing
                  amixedfailuremodeoftensionandshearasthebeddingdipangleincreases.
                  Keywords:sandstone;doubleKfracturemodel;beddinginclinationangle;sampleheight;failuremode

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